http://etc.usf.edu/clipart/ Free clipart for students & teachers! Welcome to quality educational clipart. Every item comes with a choice of image size and format as well as complete source information for proper citations in school projects. No advertisement-filled pages with pop-up windows or inappropriate links here. A friendly license allows teachers and students to use up to 50 items in a single, non-commercial project without further permission. http://etc.usf.edu/clipart/i/banner.jpg http://etc.usf.edu/clipart/ This website is CoolIris enabled! You can use the CoolIris browser plugin to view the images on this site in an interactive 3D wall.<br><br><br><br> http://www.cooliris.com/ "Simple sponge (Ascetta primordialis). Note the vase-like form, the apical osculum, the inhalant pores in the walls." -Thomson, 1916... http://etc.usf.edu/clipart/47800/47876/47876_simple_spong.htm Diagram showing the Ascon type of sponge. ec., ectoderm; r.c., radiating canals; i.p., internal pores; mes., mesenchyma, e.p., external pores.... http://etc.usf.edu/clipart/48100/48181/48181_ascon_sponge.htm "Diagram showing types of canal system. --After Korschelt and Heider. The flagellate regions are dark throughout, the mesogloea is dotted, the arrows show the direction of the currents. All the figure... http://etc.usf.edu/clipart/47800/47880/47880_spo_canal.htm "Gastrula of a Chalk-sponge (Olynthus). A, external view." -Whitney, 1911... http://etc.usf.edu/clipart/64700/64756/64756_gastrula.htm "Gastrula of a Chalk-sponge (Olynthus). B, longitudinal section through the axis: g, primitive intestine; o, blastopore; i, inner cell-layer of the body-wall; e, outer cell-layer." -Whitney, 1911... http://etc.usf.edu/clipart/64700/64757/64757_gastrula.htm A sponge colony.... http://etc.usf.edu/clipart/47800/47877/47877_spo_colony.htm "Connective tissue of sponge." &mdash; Encyclopedia BSponge Diver Counting Cardsritannica, 1893... http://etc.usf.edu/clipart/27000/27024/connective_27024.htm Isolated spicular bodies of an extinct silicious sponge. (<i>Epistomella clivosa</i>).... http://etc.usf.edu/clipart/62200/62205/62205_epistomella.htm A sea sponge in the shape of a human glove. ... http://etc.usf.edu/clipart/8200/8228/neptun_glove_8228.htm A modern sponge with silicious skeletal structure, and basal glass fibers for fixation (<i>Holtenia carpenteri</i>).... http://etc.usf.edu/clipart/62200/62203/62203_holtenia.htm Part of the skeletal structure of a lithisdid silicious sponge.... http://etc.usf.edu/clipart/62200/62206/62206_jereiea.htm "Diagrammatic representation of development of Oscarella lobularis. Bl., Free-swimming blastula with flagella; G., gastrula settled down. Next figure shows folding of inner layer (En.); Ec., outer lay... http://etc.usf.edu/clipart/47800/47881/47881_o_lobularis.htm "Section of a sponge. Showing inhalant canals, flagellate chambers, a gastrula forming in the mesogloea, etc." -Thomson, 1916... http://etc.usf.edu/clipart/47800/47879/47879_spo_section.htm Part of the outer wall of this Calcolynthus is cut away. This is a simple sponge.... http://etc.usf.edu/clipart/5900/5909/simple-sponge_1.htm "Diagrams to illustrate the development of one of the simpler types of sponge: I, the egg; 2, section of 16- to 32-celled stage; 3, section of later stage, a ciliated larva (blastula); 4, gastrula; 5,... http://etc.usf.edu/clipart/48100/48180/48180_simp_sponge.htm "Sponge spicules. 1, Monaxon; 2, triod; 3, triaxon; 4, tetraxon; 5, anchor; 6, polyaxon; 7, a kind of amphidisc." -Thomson, 1916... http://etc.usf.edu/clipart/47800/47878/47878_spo_spicules.htm Spicules may be made of silica or calcium carbonate, and vary in shape from simple rods to three-dimensional "stars" with up to six rays. Spicules are produced by sclerocyte cells, and may be separate... http://etc.usf.edu/clipart/69300/69381/69381_sponge_spicu.htm In this simple sponge, water enters minute holes in the sides and passes out of the opening at the top of the tube.... http://etc.usf.edu/clipart/7000/7059/sponge_7059.htm In this simple sponge, part of the outer wall is cut away to show the inside.... http://etc.usf.edu/clipart/7000/7060/sponge_7060.htm A cross-section of a simple tubular sponge. ... http://etc.usf.edu/clipart/7000/7061/sponge_7061.htm A diagram of a commercial sponge. ... http://etc.usf.edu/clipart/7000/7062/sponge_7062.htm A typical sea sponge growing on the ocean floor... http://etc.usf.edu/clipart/8200/8226/sponge_8226.htm An animal of the porifera class, having pores in the body-wall and being without tentacles.... http://etc.usf.edu/clipart/23000/23066/sponge_23066.htm "Diagram of simple type of sponge. c, cloaca; ch, chambers, lined with flagellate entoderm; e.p., external pores; i.p., internal pores; mes., mesenchyma; o, osculum; r.c., radiating canals. In the ad... http://etc.usf.edu/clipart/24900/24956/sponge_24956.htm The sponge, a many celled animal, begins its life as a single-cell, the egg. ... http://etc.usf.edu/clipart/69300/69370/69370_sponge.htm