A. E. Verrill Decapod Crustacea of Bcnnmln. 



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form has the carapace more strongly areolated and appears rougher, 

 owing to the relatively larger granules and more elevated tuber- 

 cles. The two frontal teeth are more acute and have a small lobe or 

 shoulder on the outer edge, while those of C. Bairdii are obtuse at 

 tips and have no lobe. The carapace has the posterior lateral spines 

 sharper, longer, and farther back, in the Atlantic form, and the sides 

 are more rapidly contracted behind the spines ; the crests of the 

 ehehe are higher and the edge more convex, the third tooth from 

 the front being longest, while in typical C. Bairdii the second is 

 longest. These teeth in the former are angular or carinate on the 



O O 



front side, while in the latter they are evenly convex ; they are 

 granulated in both. The outer surface of the chelae has fewer but 



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larger tubercules in the Atlantic form, and the lower edge is bevelled 



Figure 47. Cycloes Bairdii, var. atlantica, from Bermuda, under side, x 

 about 1. Phot. A. H. V. 



and has two rows of small rounded granule-like denticles, while in 

 O. Bairdii it is flatter, with two rows of larger obtuse denticles. 

 The large tooth, near the lower proximal end, is acute-triangular in 

 O. Bairdii ; broadly rounded and obtuse in the Atlantic form. 



There are various other minor differences, but whether they are 

 constant or not is uncertain, on account of the small number of 

 Atlantic specimens available for comparison. I have not been able 

 to compare the male appendages. 



There is much difference in the abdomen, but this is evidently 

 largely due to the immaturity of the smaller specimen. 



