938 DR. H. J. HANSEN ON CRUSTACEANS [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 little interest for our knowledge 
of the genus, are omitted. 
The genus Sergestes was established by H. Milne-Edwards in 
1830 (“ Deser. d. genres Glaucothoé, Sicyonie, Sergeste et Acéte,” 
Ann. d. Se. 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 G. de Natale (Descriz. zool. d’una nuova specie di Plojaria et 
di aleune Crostacei del porto di Messina) described and figured one 
new species.—In 1855 H. Kroyer published preliminary de- 
scriptions (“ Bidrag til Kundskab om Krebsdyrslegten Sergestes, 
Edw.,” Overs. K. D. Vidensk. Selsk. Forhandl. i 1854) of 15 new 
species, and in 1859 his well-known monograph (“ Forség til en 
monographisk Fremstilling af Krebsdyrslegten Sergestes, Med. 
Bemerkninger om Decapodernes Héreorganer,” K. D. Vidensk. 
Selsk. Skrifter, 5 Raekke, 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 these 
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 larve 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. serrulatus, S. caudatus, and S. laciniatus were captured in the 
Kattegat off Denmark, this is absolutely a mistake, all 3 species 
originating in the subtropical or tropical seas.—In 1861 
W. Stimpson published (“ Prodrom. deser. animal. evertebr., quae in 
Exped. ad Ocean. Pacific. Septentrion. .. .,” Proceed. Acad. Nat. 
Se. 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. Ordnungen Edriophthalmata und Podoph- 
thalmata,” Jahresber. der Commission 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 Penzidea,” Ann. & Mag. Nat. Hist. ser. 5, vol. viii.) 
preliminary descriptions of 4 new species (and of the new genus 
Petalidium), 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’ 
Report, 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 
Kréyerian descriptions and a new representation of 7 of Kréyer’s 
species examined by himself. He indicates “Greenland ” as the 
