. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 4SO CRUSTACEA. there are five pairs of long spiny , 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 Eurypteridce (in the general shape of their body) to the ticorpionidce is very striking, while the genus Hemiaspis presents affinities to the Pcecilopoda. The most important forms are: Eurypterus pygmceus SaFt., Devonian strata, Pterygotus anglicus Ag., four feet long, from the
. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 4SO CRUSTACEA. there are five pairs of long spiny , 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 Eurypteridce (in the general shape of their body) to the ticorpionidce is very striking, while the genus Hemiaspis presents affinities to the Pcecilopoda. The most important forms are: Eurypterus pygmceus SaFt., Devonian strata, Pterygotus anglicus Ag., four feet long, from the upper Silurian (fig. 373).. FIG. 3~3.—Euryptrrns remipfs after Nieszkowski. a, Dorsal view ; b, ventral view; O, eyes; Sf. caudal spine ; H, hypostome. Order 2.—XIPHOSURA.* Giyantostraca ivhose body is divided into three parts, icJiich are movably articulated together ; a large shield-shaped cephalo-thorax, an abdomen with five jxtirs of lamellar feet and a long movable caudal spine. The large body of these Crustacea is covered with a strong chiti- * C. Gcgcnbaur, " Anatomischc Untersuchung eincs Limulus, mit besonderer Beriicksichtigung • naturforxch. Gesi'lhcliaft zu JfaUt', 1858. Packard. ''The Development of Limulus Polyphemus.'1 Sue. of Nttt 1870. A. M. Edwards. •' Kcchcvchcs sur 1'anatomie dcs Liinules," Ann. w. nat. Vc Ser. Tom. 1872-1873. [E. R. Lankestor, "Limulus an Arachnid.'' Quart. Journ. Mir. Soc., vol. xxi.]. 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 Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. London, Swan Sonnenschein & co.
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