"A species after death, when the weapons of death have been rubbed off; that is to say, the bristles.…
The organs of mastication of the Sea Urchin. Mastication, or chewing, is the process by which food is…
Scotoplanes live on or just underneath the surface of the bottom of the ocean, on the abyssal plain.…
"A species after death, when the weapons of death have been rubbed off; that is to say, the bristles.…
"Types of spermatozoa. A, from the round worm (Ascaris) with a cap, somewhat amaeboid; B, from the Crayfish,…