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"Starfish. I. Ventral surface; t.f., tube-feet extended; a.g., the ambulacral groove with the tube-feet retracted; m., the mouth. II. Dorsal surface, showing the position of the madrepore (M.); the two adjacent arms form the bivium." -Thomson, 1916

Starfish

"Starfish. I. Ventral surface; t.f., tube-feet extended; a.g., the ambulacral groove with the tube-feet…

"Diagrammatic cross-section of starfish arm. n., Radial nerve; b.v., radial blood vessel according to Ludwig, septum in pseud-haemal vessel according to others; w.v., radial water vessel; am., ampulla; t.f., tube-foot; p.c., a pyloric caecum cut across; s.p., a calcareous spine; g., a skin-gill; lac., spaces in the wall; go., ova in ovary; a.o., ambulacral ossicle." -Thomson, 1916

Starfish Arm

"Diagrammatic cross-section of starfish arm. n., Radial nerve; b.v., radial blood vessel according to…