1896.] OF THE GESaS aBUGBSTBS. 939 



locality for all the animals described by Kriiyer, though only one of 

 Kroyer's species was taken in that neighbourhood — a curious 

 mistake which has already been corrected by Ortmann. He 

 cancels 2 of Kroyer's species, but one of the two, S. arciicus, is a 

 valid species. Bate also employs numerous pages and several 

 plates in the representation of larval stages (see later on). This 

 large contribution is of course of great importance, but unfortu- 

 nately neither the descriptions nor the figures are so good as could 

 bo wished, and in numerous instances (see later on) a re-exami- 

 nation of the type specimens is absolutely necessary — the greater 

 part of the now species are but larvse. Besides the genus 

 Petalidium he also establishes the genus Sciacaris, each of these 

 containing one sj)ecies. The latter genus is of no value, it is but a 

 SergestesAarva. — For some small but classical contributions we 

 are indebted to S. I. Smith. In 1882 he gives (" Eeport on the 

 Eesults of Dredging, und. the supervis. of Al. Agassiz . . .," Bull, of 

 the Mus. of Compar. Zool. vol. x.) the correct branchial formula of 

 S. arcticus, Kr., and an excellent description with good figures of a 

 new species ; in 1884 ("Eep. on the Decap. Crust, of the Albatross 

 Dredgings ... in 1883," U. S. Comm. of Pish and Fisheries, pt. x.; 

 Eep. f. 1882) he describes a new species and gives figures of 

 S. arcticus, Kr., and S. robustus. Smith; in 1886 ("Eep. on the 

 Decap. Crust. ... in 1884," U. S. Comm. of Fish and Fisheries, 

 pt. xiii. ; Eep. f. 1885) he communicates a plate with figures of 

 earlier described species. — In 1888 C. Chun ("Die pelag. Thierwelt 

 in gross. Meerestiefen . . .," Bibliotheca Zoologica, B. 1) describes 

 and figures one new species, captured with a " Schliessnetz," and 

 in 1885) ("Bericht iib. eine nach d. Canarischen Inseln im Winter 

 1887-88 ausgef . Eeise," Sitzungber. d. k. I'reuss. Akad. d. Wissensch. 

 zu Berlin, Jahrg. 1889) another and very curious new species. 

 —In 1891 J. Wood-Mason (" Nat. Hist. iSTot. from H.M. Indian 

 Marine Survey Steamer ' Investigator,' " Ann. & Mag. Nat. Hist. 

 6th ser. vol. vii. 1891 and vol. viii. 1891) establishes two new 

 species ; and, as a continuation of the same publication, A. Alcock 

 and A. E. Anderson in 1894 (Jom-n. Asiat. Soc. of Bengal, 

 vol. Ixiii. 1894) describe a third new species, of which a figure 

 was published later on, in 1895 (Illustrations of the Zool. of the 

 E. Ind. Mar. Surv. Steamer ' Investigator': Calcutta 1895). — In 

 ]893 A. Ortmann (" Decapoden und Schizopoden," Ergebnisse d. 

 Plankton-Exped. d. Humboldt-Stiftung, B. ii. G. b.) gives a more 

 important contribution, containing descriptions and figures of 2 

 new species, additional notes and corrections on several earlier 

 known species, and the cancelling of 3 names as synonyms ; he also 

 tries to make up an analytical key of most of the known species, 

 distributing them into the genera iSeiyestes and Serf)ia, but as the 

 greater part are larval forms with several of the characters 

 changing from stage to stage, the keys are of no value. — Finally 

 W. Faxon in 1893 (" Prel. Descr. of new Spec, of Crust. — Eep. on 

 the Dredg. Operat. off the West Coast of Centr. America . . .," 

 Bull, of the Mus. of Compar. Zool. vol. xxiv.) describes 3 new 



