_ 1896.] OF THE GENUS SERGESTES. 932 
locality for all the animals described by Kréyer, though only one of 
Kréyer’s species was taken in that neighbourhood—a curious 
mistake which has already been corrected by Ortmann. He 
cancels 2 of Kréyer’s species, but one of the two, S. arcticus, 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 
be wished, and in numerous instances (see later on) a re-exami- 
nation of the type specimens is absolutely necessary—the greater 
part of the new species are but larve. Besides the genus 
Petalidium he also establishes the genus Sciacaris, each of these 
containing one species. The latter genus is of no value, it is but a 
Sergestes-larva.—For some small but classical contributions we 
are indebted to 8S. I. Smith. In 1882 he gives (‘‘ Report on the 
Results 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 (Rep. on the Decap. Crust. of the Albatross 
Dredgings .. . in 1883,” U.S. Comm. of Fish and Fisheries, pt. x.; 
Rep. f. 1882) he describes a new species and gives figures of 
S. arcticus, Kr., and S. robustus, Smith; in 1886 (“ Rep. on the 
Decap. Crust... .in 1884,” U. 8. Comm. of Fish and Fisheries, 
pt. xili.; Rep. 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 1889 (“ Bericht ib. eine nach d. Canarischen Inseln im Winter 
1887-88 ausget. Reise,” Sitzungber. d. k. Preuss. Akad.d. Wissensch. 
zu Berlin, Jahrg. 1889) another and very curious new species. 
—In 1891 J. Wood-Mason (“ Nat. Hist. Not. from H.M. Indian 
Marine Survey Steamer ‘ Investigator,’” Ann. & Mag. Nat. Hist. 
6th ser. vol. vii. 1891 and vol. vii. 1891) establishes two new 
species; and, as a continuation of the same publication, A. Alcock 
and A. R. Anderson in 1894 (Journ. 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 
R. Ind. Mar. Surv. Steamer ‘ Investigator’: Calcutta 1895).—In 
1893 A. Ortmann (“ Decapoden und Schizopoden,” Ergebnisse d. 
Plankton-Exped. d. Humboldt-Stiftung, B. i. 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 Sergestes and Sergia, 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.—Rep. on 
the Dredg. Operat. off the West Coast of Centr. America. . .,” 
Bull. of the Mus. of Compar. Zool. vol. xxiv.) describes 3 new 
