1576 THE VOYAGE OF H.M.S. CHALLENGER. 



have been classified elsewhere. In 1879 and 1887 Claus placed the Oxycephalida? as the 

 fifth family of the Platyscelidan group, and defined it to the following effect : — 



" Body more or less laterally compressed and elongate, with long rostrum, the pleon 

 extensive, with stiliform uropods. The branchial vesicles are elongate, simple. The 

 laminar first joints of the third and fourth pereeopods thin and comparatively weak. 

 Fifth pereeopods very weak, but generally complete. The hinder antenna? of the female 

 and both pairs of maxilla? degraded. Two otolith-vesicles are uniformly present." 



Claus includes in the family only the two genera, Oxycephalus and Rhabdosoma, for 

 which Dana originally formed the subfamily Oxycephalina?. Streets added the genus 

 Leptocotis in 1877 and Calamorhynchus in 1878. Bovallius in 1887 added the genera 

 Glossocephalus and Tulbevgella, changed the name Rhabdosoma into Rhabdonectes, and 

 gave the following diagnosis of the family : — 



" Head long, produced anteriorly into a rostrum. Eyes large, not occupying the 

 whole head. First pair of antenna? fixed at the under-side of the head in a special 

 groove between the rostrum and the eyes ; first joint of flagellum tumid, the rest 

 subterminal, few-jointed. Second pair fixed at the under hinder corner of the head, 

 angularly folded (£) or wanting (?). Pereiopoda [Gnathoi^ods and Pereeopods] are 

 walking legs. Seventh pair [Fifth Perseopods] complete or rudimentary." 



The expression " pereiopoda are walking legs " is rather obscure, and not applicable 

 to the gnathopods. 



Genus Oxycephalus, Milne-Edwards, 1830. 



1830. Oxycephalus, Milne-Edwards, Ann. d. Sci. Nat., t. xx. pp. 385, 396 (extr., pp. 34, 45). 



1832. Orio (pars), Cocco, Eflemeridi scient. e lett. per la Sicilia, t. ii. N. 6. 



1833. „ „ Cocco, Giornale di Scienze Lettere e Arti per la Sicilia, t. xliv. 

 1833. „ Prestandrea, Eflemeridi scient. e lett. per la Sicilia, t. vi. N. 16. 

 1836. Oxycephalus, Gu6rin, Magasin de Zoologie, t. vi. CI. vii. p. 9. 



1838. „ Milne-Edwards, Hist. nat. des Anim. sans vertebres, t. v. 



1840. Orio (j>ars), 0. G. Costa and A. Costa, Catal. de' Crost. del Regno di Napoli. 



1840. Oxycephalus, Lucas, Hist. Nat. des Crust., Arachn. et Myriap., p. 240. 

 1840. ,, (pars)-, Milne-Edwards, Hist. Nat. des Crustaces, t. iii. p. 99. 



1849. „ Nicolet, Historia fisica y politica de Chile por Claudio Gay, Zool., t. iii. 



1850. Ornithoramphus, de Natale, Descr. Zool. di alcuni crost. del porto di Messina. 



1850. Erpetoramphus, de Natale, Su pochi Crostacei del porto di Messina (See Appendix). 



1851. Orio (pars), Costa, in Hope's Catal. dei Crost. Ital., p. 21. 

 1851. Ornithorhamphus, Costa, in Hope's Catal. dei Crost. Ital., p. 21. 



1851. Erpetorhamphus, Costa, in Hope's Catal. dei Crost. Ital., p. 22. 



1852. Oxycephalus, Dana, Arner. Journ. Sci. and Arts, ser. 2, vol. xiv. No. 41. 

 1852. „ Dana, U.S. Explor. Exped., vol. xiii. pt. ii. pp. 1009, 1443. 

 1862. „ Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 342. 



1864. Natalius, Costa, Rend, della R. Acad, delle Sci. Fis. e Matem. di Napoli, Fascicolo iv. 

 1864. Carcinornis, Costa, Rend, della R. Acad, delle Sci. Fis. e Matem. di Napoli, Fascicolo iv. 

 1871. Oxycephalus, Claus, TJnters. iiber den Bau und Verwandschaft der Hyperiden, Nachrichten 

 K. Gott. Soc, p, 155. 



