. Elements of comparative zoology. Zoology. 280 SYSTEMATIC ZOOLOGY Class IV.—ECHINOIDEA (Sea-urchins). In the sea-urchins the body is spherical, heart-shaped, or disc-like, and the ambulacral areas extend, like meridians,. Fig. 94.—Crinoid (Pentacrinuf), half natural size. From Brehm. Fig. 95.—Mouth area of a crinoid (Comatula), showing the course of the intestine leading from the mouth (m) to the vent (a), g, grooves leading from arms to mouth. from oral to anal regions. In short, sea-urchins are easiest compared with starfishes, if we imagine the arms of the. Please note that these images ar
. Elements of comparative zoology. Zoology. 280 SYSTEMATIC ZOOLOGY Class IV.—ECHINOIDEA (Sea-urchins). In the sea-urchins the body is spherical, heart-shaped, or disc-like, and the ambulacral areas extend, like meridians,. Fig. 94.—Crinoid (Pentacrinuf), half natural size. From Brehm. Fig. 95.—Mouth area of a crinoid (Comatula), showing the course of the intestine leading from the mouth (m) to the vent (a), g, grooves leading from arms to mouth. from oral to anal regions. In short, sea-urchins are easiest compared with starfishes, if we imagine the arms of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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