136 STALK-EYED CRUSTACEA. 
branch of the second abdominal appendage in the male bears on its inner 
margin a short blunt stylamblys, which is absent in S. agassizii ; in neither of 
these two species is this segment produced into a lobe at the base of its outer 
margin as it is in the more typical species of Selerocrangon, e.g. S. ferox and 
S. atrox. There are four thoracic and five abdominal sternal spines in the 
male, as in S. agassizii. In the mature female these spines are obsolete as in 
the female S. agassizi. 
Length of a male specimen, 49 mm. ; carapace, 13.3 mm.; abdomen, 36 
mm.; length of a female, 64 mm., carapace, 18 mm., abdomen, 46 mm. 
Station 3380. 899 fathoms. 1 male, juv. 
S418. G60. 9% 2 males, 3 fem. (1 bopyrized). 
‘i eta0%, Soo.” 2 fem. ovig. 
te OLoOn- oom oi 1 fem. 
This species is very nearly related to S. agassizii Smith,* of the east coast 
of North America. In addition to the differences between the two species 
already noticed, I may mention the following :- the rostrum of S. procax is 
longer and inclined upward at a much sharper angle than in the Atlantic 
species; the same is true of the antero-lateral spines of the carapace ; the 
most conspicuous difference is found in the anterior spe of the median 
carina of the carapace, which is much longer and nearly erect in S. procaz. 
The arrangement of the carinz and spines is the same in the two species. 
I agree with Professor Smith in consigning these two species to the genus 
Selerocrangon, although G. O. Sars’s diagnosis of this genus must be somewhat 
modified for their inclusion. In the typical species of Sclerocrangon, the 
rostrum is expanded into a keel below, while in S. agassiza and S. procax 
it is spine-like; the terminal segment of the inner branch of the second 
abdominal appendage is bilobed in the male of the typical Selerocrangon, 
whereas in S. agassizi it is simple, and in S. procax it consists of a single 
lobe which bears a stylamblys on its inner edge. In other respects these 
two species agree with the more typical species of Sclerocrangon. 
* Coraphilus agassizii Smith, Bull. Mus. Comp. Zoél., Vol. X., No. 1, pp. 82-34, Plate VII. Fig. 4-5¢, 
1882; Sclerocrangon agassizii Smith, Aun. Rep. U. 8. Fish Comm. for 1885, p. 652, 1886. This species, as 
before stated, is apparently the same as Poxtophilus jacqueti A. M. Edw. (Comptes Rendus, XCIIT. 935, 1881; 
figured in A. Milne Edwards’s Recueil de Figures de Crustacés nouveaux ou peu conunus, 1‘ Livr., 1883), 
collected off the south coast of Europe by the “ Travailleur ” expedition. 
