6 BULLETIN OF THE 



This species has also heen taken in considerable abundance, in 50 to 200 

 fathoms, off Martha's Vineyard, by the U. S. Fish Commission. The remarks 

 under the last species in regard to coloration, acuteness of the dentation of the 

 edge of the carapax, etc., apply equally well to this species. The fact that this 

 species and C. irroratus as well are regular inhabitants of the deep water off 

 our southern coast is sufficient to account for their occasional occurrence in 

 shallow water at the Bermudas, and even in the West Indies. 



Cancer Bellianus Johnson (Proc. Zool. Soc. London, 1861, p. 240, PI. 

 XXVIII.) from Madeira, is much like this species, but apparently distinct 

 from it. 



Geryon quinquedens Smith. 



Trans. Conn. Acad., V. p. 35, PI. IX. figs. 1-1 b, 2, 1879 ; Proc. National Mus. 



Washington, III. p. 417, 1881. 



These specimens and others recently obtained by the U. S. Fish Commission 

 show that this species groAvs to be one of the largest of the Brachyura. The 

 very large individuals differ considerably from the specimens originally de- 

 scribed. In all the large specimens the teeth of the antero-lateral margin of 

 the carapax become reduced to angular tubercles, and in some of the larger 

 ones the fourth tooth becomes entirely obsolete. Thus in specimens No. 2, 3, 5, 

 7, and 8 of the table of measurements given below, the fourth tooth is distinct ; 

 in No. 9, distinct, but very obtuse ; in No. 4, distinct, but the right side of the 

 carapax deformed by some injury ; in No. 1, nearly obsolete ; while in Nos. 

 6 and 10 it is entirely obsolete. 



Ten specimens give the following measurements : — 



No. station. Sex. Length of Carapax. Breadth including spines. Breadth excluding spines. 



1 312 ^ 41.0 mm. 51.6 mm. = 1.26 Igth. 45 mm. = 1.10 Igth. 



2 309 " 54.0 65.5 



3 334 " 81.0 97.0 



4 " " 94.0 113.0 



5 3.32 " 116.0 136.5 



6 " " 130.0 152.5 



7 309 9 47.5 61.0 



8 343 " 82.5 99.5 



9 " " 84.0 100.0 

 10 « " 92.0 107.5 



