Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 480 CRUSTACEA. there are five pairs of long spiny legs, of which the last is much the largest and ends in a broad swimming-fin. Some of the anterior appendages may be armed with a chela. The resemblance of the true Eurypt&ridai (in the general shape of their body) to the Scorpionidas is very striking, while the genus Hemiaspis presents affinities to the P&cilopoda. The most important forms are: Eurypterus p!/1!''' us Salt., Devonian strata, Pteryyotus anylicus Ag., four feet long, from t
Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 480 CRUSTACEA. there are five pairs of long spiny legs, of which the last is much the largest and ends in a broad swimming-fin. Some of the anterior appendages may be armed with a chela. The resemblance of the true Eurypt&ridai (in the general shape of their body) to the Scorpionidas is very striking, while the genus Hemiaspis presents affinities to the P&cilopoda. The most important forms are: Eurypterus p!/1!''' us Salt., Devonian strata, Pteryyotus anylicus Ag., four feet long, from the upper Silurian (fig. 373). FIG. $73.—Eurypferus remipr-s fitter Xieszkowski. a, Dorsal view ; 6, ventral view ; O, eyes; St. caudal spiiie ; H, kypostome. Order '2.—XIPHOSURA.* Gigantostraca ivhose body, is divided into three parts, wJtich are movably articulated together ; a large sliidd-sliaped cephalo-thorax, an abdomen with Jive pairs of lamellar feet and a long movable caudal spine. The large body of these Crustacea is covered with a strong chiti- * 0. Gegeubaur, ' Anatomische Untersuchung eincs Limulus, mit besonderer Beriicksichtigung clcr Gcwebe,' AWinndl. <!• nntvrforach. Gcst-lhdiaft zu Hnllc, IV., 1858. Packard. 'The Development of Limulus Polyphemus,' Soc. of \at. Hist., 1S70. A. M. Edwards. •• Itecherches sur 1'anatomie des Limules,' Ann. «'. nut. Ve Ser. Tom. 1872-1873. [E. E. Lankester, 'Limulus au Arachnid,7' Quart. Journ. Mic. Sue., vol. xxi.]
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