938 Dn. H. J. HANSEN ON OEUSTAOHANS [DeC. 1, 



other contributions have been published during the last few years, 

 it will be convenient to give a short account of all the papers 

 containing descriptions of new species, and, moreover, to make 

 some few remarks on the most important contributions treating of 

 the development. Papers which contain no descriptions of new 

 species, and generally are but of litlle interest for our knowledge 

 of the genus, are omitted. 



The genus Sergestes was established by H. Milne-Edwards in 

 1830 (" Descr. d. genres Glaucothoe, Sicyonie, Sergeste et Ac^te," 

 Ann. d. Sc. Natur. t. xix.) with one new species, and in his Hist. 

 Natur. d. Crust, t. ii. 1837, he does not know more species. — In 

 1850 fx. de Natale (Descriz. zool. d'una nuova specie di Plojaria et 

 di alcune Orostacei del porto di Messina) described and figured one 

 new species. — In 1855 H. Kriiycr published preliminary de- 

 scriptions (" Bidrag til Kundsljab om Krasbsdyrslasgten Sergestes, 

 Edw.," Overs. K. D. Vidensk. Selsk. Eorhandl. i 1855) of 15 new 

 species, and in 1859 his well-known monograph (" Forsog til en 

 monographisk Fremstilling af Krsebsdyrslasgten Sei-gestes, Med. 

 Bemcerkninger om Decapodernes Iloreorganer," K. D. Vidensk. 

 Selsk. Skrifter, 5Eaekke, Nat. Math. Afd. iv. 2) containing full 

 descriptions and numerous figures of the same 15 species. The 

 descriptions are worked out with his usual care, and both tlicso 

 and the plates surpass almost all subsequent contributions ; but 

 his scanty material of most species and complete ignorance of the 

 development have given rise to the error, at that time very 

 excusable, of treating larvae as adult species. Of corrections I 

 shall only here mention that 3 of his species do not belong to the 

 genus (see later on) ; and that when he states that the examples 

 of S. serritlatus, S. caudatus, and ^. luciniatus were captured in the 

 Kattegat oH Denmark, this is absolutely a mistake, all 3 species 

 originating in tlie subtroi)ical or tropical seas.— In 1801 

 \V. Stimpson publisJied (" I'rodrom. descr. animal, evertebr., quae in 

 Exped. ad Ocean. I'acitic. Septentrion. . . .," Proceed. Acad. Nat. 

 Sc. Philadelphia, 1860) shorter descriptions of 5 new species, one 

 of which he transferred to a new genus, Sergia, which must be 

 cancelled as being of no value at all. — In 1875 A. Metzger 

 (" Crustaceen aus d. Ordnungeu Edriophthalmata und Podoph- 

 thalmata," Jahresber. der Connnission zur wiss. Unters. der 

 deutschen Meere in Kiel fiir die Jahre 1872, 1873 : Berlin, 1875) 

 established one new species. — In 1881 C. Spence Bate published 

 (" On the Peuajidea," Ann. & Mag. Nat. Hist. ser. 5, vol. viii.) 

 preliminary descriptions of 4 new species (and of the now genus 

 Fetalidium), all from the ' Challenger ' ; the paper is of some 

 importance for the priority of at least one of the names. In 

 1888 Bate's above-mentioned large contribution in the 'Challenger' 

 lleport, vol. xxiv., was issued. Together with the species in the 

 preliminary paper he describes in all 24 new species of Sergestes, 

 but figures only 18 of them; next he gives an extract of the 

 Kroyerian descriptions and a new representation of 7 of Kroyer's 

 species examined by himself. He indicates " Greenland " as the 



