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. agussizii ; 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 tj-pical species of Schrucru/ijon, e. g. S. fcrox and 

 S. atrox. There are four thoracic and five abdominal sternal spines in the 

 male, as in S. agasskii. In the mature female these spines are obsolete as in 

 the female S. agassizii. 



Length of a male specimen, 49 mm. ; carapace, 13. .3 mm. ; abdomen, 36 

 nmi. ; length of a female, 64 mm., carapace, 18 nun., abdomen, 46 mm. 



Station 3380. 899 fathoms. 1 male. juv. 



" 3418. 660 " 2 males, 3 fem. (1 bopyrized). 



" 3435. 859 " 2 fem. ovig. 



" 3436. 905 " 1 fem. 



This species is very nearly related to aS'. agassim Smith,* of the east coast 

 of Xortli 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 spine of the median 

 carina of the carapace, which is much longer and nearly erect in ^S*. procax. 

 The arrangement of the carinaj and spines is the same in tlie two species. 



I agree with Professor Smith in consigning these two species to the genus 

 Sclerocrmigon, altliough G. 0. Savs'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, wliile in *S'. agamsii and S. procax 

 it is spine-like ; the terminal segment of the inner branch of the second 

 abdominal appendage is bilobed ni the male of the typical Sclerocrangon, 

 whereas in ^S'. agassizii 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. 



• Ceraphiluf agaaahii Smith, Bull. Mils. Comp. Zool., Vol. X., No. 1, pp. 32-34, Plate VII. Fig. 4-5", 

 1882; Sclerocrangon agnmizii Smith, Ann. Rep. U. S. Fish Comm. for 1885, p. 652, 1886. This species, as 

 before stated, is apparently the same as Ponlopliilus jacqueti A. M. Edw. (Coniptcs Rendiis, XCIII. 935, 1881 ; 

 figured in A. Milne Edw.irds's Ilecueil dc Figures de Crustac6s nouveaux ou pen connus, 1*'" Livr., 1883), 

 collected off the south coast of Europe by the " Travailleur " expedition. 



