. Principles of economic zoo?logy. Zoology, Economic. 58 BRANCH EOHINODERMATA stars. The one most common on our shores (Ophiopholis) is of a " general red hue spotted with brown and paler ; CLASS III. ECHINOIDEA The globular or disk-like sea-urchins have the pentameral plan, as a cleaned " test " or shell (Fig. 44) will show. The body wall is composed of several hundred pentagonal calcareous plates arranged in regular order in twenty rows, the whole forming a sort of thin case or shell (see Fig. 44).. Fig. 44.—Sea-urchin (Echi'nus micros'tunid) with spines nearly all re
. Principles of economic zoo?logy. Zoology, Economic. 58 BRANCH EOHINODERMATA stars. The one most common on our shores (Ophiopholis) is of a " general red hue spotted with brown and paler ; CLASS III. ECHINOIDEA The globular or disk-like sea-urchins have the pentameral plan, as a cleaned " test " or shell (Fig. 44) will show. The body wall is composed of several hundred pentagonal calcareous plates arranged in regular order in twenty rows, the whole forming a sort of thin case or shell (see Fig. 44).. Fig. 44.—Sea-urchin (Echi'nus micros'tunid) with spines nearly all removed from " ; (Chapin and Rettger.) The ossicles, or plates, are armed with very long sharp spines for defense (Fig. 45). Alternate rows of plal(>s are perforated for the passage of the tube-feet, tlu^re being no groovi^s. These ten rows of perforated plates constitute the ambulacral areas, and the ten rows of unperforated plates constitute the inter- aml)ulacral areas. Color.—The colors are brown, olive, purple, red, green, or blue. The protective resemblance is good. The ambulacral system of the sea-un^hin is similar in plan. 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 Daugherty, Lewis Sylvester, 1857-; Daugherty, L. S. , Mrs. , 1859-. Philadelphia, London, W. B. Saunders
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1915
