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136 



STALK-EYED CRUSTACEA. 



brancli of the second abdominal appendage in the male bears on its inner 



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margin a short blunt stj]amb]j>s, which is absent in S\ agassim ; 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 Merocrangon, c. g. >S'. ferox and 

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



In the mature female these spines are obsolete as in 



male, as in 8. 



the female 8. agassizii. 



Length of a male specimen, 49 mm. ; carapace, 13.3 mm.; abdomen, 

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



Station 3380. 899 fathoms. 1 male, juv. 



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660 



3435. 859 



3436. 905 



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2 males, 3 fem. (1 bopjrized). 

 2 fem. ovig. 

 1 fem. 



This species is very nearly related to 8. agmmvi Smith,* of the cast coast 

 of North America. In addition to the differences between the two species 

 already noticed, I may mention the following : the rostrum of 8. 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 8. procax. 

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



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

 Sckrocrcwgon, although G, 0. 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 8. agassizu and 8. 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 8clcrocrangon, 

 w^hereas in 8, agassizii it is simple, and in 8. 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 8clerocrang(nu . 



* CerapMlus agassizii Smith, Bull. Mus. Comp. ZooL, Vol. X., No. 1, pp. 32-34, Plate VII. Fig. 4-5«, 

 18S2; Sderocrangon agassizii Smith, Ann. Hep. U. S. Fish Comm. for 1885, p. 652, 188G. This species, as 

 before stated, is apparently the same as Ponlophihs jar.gueti A. M. Edw. (Comptes llenduS; XCIII. 935, 1881 ; 

 figured in A. Milne Edwards's Recueil de Figures de Crustacds nouvcaux ou pen conuus, 1^''« Livr., 1883), 

 collected off tiie south coast of Europe bj the " Travailleur " expedition. 



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