MUSEUM OF COMPARATIVE ZOOLOGY. 199 
form with G. elegans, but differs wholly in the pattern of its color marks 
from both G. elegans and G. panamense. G. zebra Richters, from Mauritius, 
is without much doubt the same as G. fasciolatum. Ortmann has lately re- 
corded a Gnathophyllum from Tahiti as a new species, G. pallidum. It differs 
from G. fasciolatum only in the absence of color marks,—a difference due 
possibly to the action of alcohol. 
Family CRANGONIDZ. 
Sclerocrangon atrox, sp. nov. 
Of the described species of Sclerocrangon, S. ferox G. O. Sars comes nearest 
to this species. These are some of the chief points of difference. In S. feror 
the upturned rostrum is simple, while in S. atrox a long acute tooth is given 
off from its ventral side, a tooth which reaches as far forward as the tip of the 
rostrum. In the former species the dorsal caring of the sixth abdominal seg- 
ment bear two pairs of well developed spines, while in the latter species one 
finds but one pair of very small spines at the posterior end of the carine. The 
pleural spines of the abdomen are much longer in the former than in the lat- 
ter, and on the fifth somite there are four to five spines on each pleura against 
two in S, atrox. The eyes are much smaller in S. feroz, and lack the spine 
above the cornea seen in S. atroz. 
Length of the largest specimen (a female), 162 mm. 
Station 3418. 660 fathoms. 3 males, 2 females (1 ovig.). 
“« 3424. 676 “ 4 females. 
Sclerocrangon procax, sp. nov. 
Nearly related to S. agassizii Smith, from the Atlantic side of the conti- 
nent. The rostrum of S. procaz is longer than in S. agassizii, and inclined 
upward at a much sharper angle ; the same is true of the antero-lateral spines 
of the carapace. The most conspicuous difference is found in the anterior spine 
of the median carina of the carapace, which is much longer and nearly erect in 
S. procax. The two flagella of the first antenna in the male, S. procaz, are 
subequal, while in the male S. agassizit the outer flagellum is much longer 
than the inner; the scale of the second antenna, moreover, is narrower in the 
former species than in the latter, and the terminal segment of the inner branch 
of the second abdominal appendage in the male bears on its inner margin a 
short blunt stylamblys, which is wanting in S. agassizii. In neither of these 
species is this segment produced into a lobe at the base of its outer margin, as 
it is in the more typical species of Seleracrangon, e. g. S. ferox and S. atrox, 
Length, 49 mm. 
Station 3380. 899 fathoms. 1 male juv. 
ie BASS) Coe a 2 males, 3 females. 
ms Sta0,. OU) 2 females ovig. 
«3436. 905° 1 female. 
