| OCR Text |
Show 1896.] OF THE GENUS SERGESTES. 939 locality for all the animals described by Krciyer, though only one 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. arctlcus, 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 unfortunately neither the descriptions nor the figures are so good as could be wished, and in numerous instances (see later on) a re-examination of the type specimens is absolutely necessary-the greater part of the new species are but larvae. Besides tbe genus Petalldium 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 S. I. Smith. In 1882 he gives (" Eeport 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. arctlcus, 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. arctlcus, Kr., and S. robustus, Smith; in 1886 (" Rep. on the Decap. Crust. ... in 1884," U. S. Comm. of Fish and Fisheries, pt. xiii.; Rep. f. 1885) he communicates a plate with figures of earlier described species.-In 1888 C. Chun ("Die pelag. Thierwelt in gross. Meerestiefen . . .," Bibliotbeca Zoologica, B. 1) describes and figures one new species, captured with a " Schliessnetz," and in 1889 ("Bericht lib. eine nach d. Canariscben Inseln im Winter 1887-88 ausgef. Reise," Sitzungber. d. k. Preuss. Akad. d. Wissensch. zu Berlin, Jahrg. 1889) another and very curious new species. - I n 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. viii. 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. lxiii. 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 unci 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 Sergestes and Sergla, but as tbe 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 |
