This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...ciliated grooves, the umbulacral or food-grooves, radiate outwards towards the bases of the arms, near which they bifurcate, so that ten grooves are formed, one passing along the oral surface of each of the ten arm-branches to its extremity. The anal opening (an) is likewise on the oral surface, being situated on a ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...ciliated grooves, the umbulacral or food-grooves, radiate outwards towards the bases of the arms, near which they bifurcate, so that ten grooves are formed, one passing along the oral surface of each of the ten arm-branches to its extremity. The anal opening (an) is likewise on the oral surface, being situated on a papilliform elevation in the interspace between two of the radiating canals. The aboral side of the disc is occupied by a large, flat, pentagonal ossicle, the centro-dorsal ossicle (Fig. 336, c; and Fig. 339, CD), bearing on its outer surface a number of little cup-like depressions, with which the bases of the cirri are connected. The cirri (ctrr) consist each of a row of slender ossicles, covered, like all the rest of the animal, with epidermis, and connected together by means of muscular fibres. Concealed from view by the centro-dorsal ossicle is a thin plate termed the "rosette" (ros), formed by the coalescence of the basals of the larva. At the sides are five first radial ossicles (R1), also partly concealed by the centrodorsal ossicle: with each of these articulates a second radial (R2), which is visible beyond the centrodorsal. With each of FIO. 337.--Antedon, oral (upper) surface of the central.% j j. i.. disc. an. anus; mo. mouth. (From Vogt and Jung.) tne SeCOnCi raaialS articulate two third radials (Rs), each forming the base of the corresponding arm-branch. The ossicles of the arms--brachials (Br.1, Br.2)--are arranged in a single row in each arm. They are somewhat elongated in the direction of the long axis of the arm, strongly convex on their aboral surfaces, longitudinally grooved on the oral surface, and connected together by the investing epidermis and by bundles of muscular fibres, by the contractions of which the movem...
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Seller's Description:
UsedGood. Hardcover; Volume 1 only; 6th edition; fading and shelf wear to exterior; f ormer owner's name written on front endpaper; fading to pages; in good cond ition with clean text, firm binding.
