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



The following list, giving all the known localities, defines the geographical limits of 

 the genus : — 



Sicyonia sculpta, Milne-Edwards ; Mediterranean, Cape Verde Islands. 



Sicyonia carinata (Olivier) ; South America and West Indies. 



Sicyonia (Hippolyte) cristata, de Haan ; Japan. Gulf of Kagosima, Stimpson. 



Sicyonia {Hippolyte) parvula, de Haan ; Japan. Gulf of Kagosima, Stimpson. 



Sicyonia (Hippolyte) bispinosa, de Haan ; Japan. 



Sicyonia ocellata, Stimpson ; China. 



Sicyonia lancifer (Olivier) ; Indian Ocean. 



Sicyonia Itevis, n. sp. ; New Guinea. 



Sicyonia sculpta, Milne-Edwards (PI. XLIII. fig. 1). 



Sicyonia sculpta, Milne-Edwards, Ann. d. Sci. Nat., ser. 1, t. xix. p. 339, pi. ix. figs. 1-8, 1830; 

 Hist. Nat. Crust., torn. ii. p. 409. 



Eostrum as long as the peduncle of the first pair of antennae ; six large teeth on the 

 dorsal crest of the carapace, and a solitary tooth on the under surface near the point of 

 the rostrum. Flagellum of the second pair of antennae slender and cylindrical. 



Length about 50 mm. (2 in.). 



Habitat. — Off St Vincent, Cape Verde Islands, and " The Mediterranean Sea." 

 (Milne Edwards). 



Such is Milne-Edwards' description of this species, with which our specimen, that was 

 taken off St. Vincent, Cape Verde Islands, seems to agree. There are six teeth on the 

 dorsal crest, the two larger ones are on the posterior half of the carapace, and the four 

 others are smaller and gradually lessen from the gastric region to the extremity of the 

 rostrum. There is a small tooth on the under surface near the point of the rostrum, but 

 this appears to be common to all the known species. 



The dorsal surface of the pleon is elevated into a narrow carina, of which the anterior 

 portion on the first somite is produced to a small tooth, directed forwards, while that on 

 the posterior extremity of the sixth somite is directed backwards. 



The telson is shorter than the lateral plates of the rhipidura. 



Length about 30 mm. (l"25 in.). 



Sicyonia carinata (Olivier) (PL XLIII. figs. 2, 3). 



Palxmon carinahis, Olivier, Encyclop., t. viii. p. 667. 



Sicyonia carinata, Milne-Edwards, Ann. d. Sci. Nat., ser. 1, t. xix. p. 344, pi. ix. fig. 44; Hist. 

 Nat. Crust., t. ii. p. 410. 

 „ ,, Dana, loc. cit., p. 602, pi. xl. fig. 1. 



The dorsal surface is carinated in the median line from the rostrum to the posterior 

 somite of the pleon. Carapace with a short rostrum directed obliquely upwards, armed 



