I 



A. E. Verrill — Decapod Crustacea of Bermuda. 365 



ously recorded. No doubt others can be obtained by using small- 

 meshed seines in the shallow ba^^s, and by the use of trawl-nets in 

 deeper water. 



We should naturally expect to find there Charybdella rubra, 

 Arencetis cribrarhis, Achelous spinicarpus, and Achelous sulcatus, 

 all of which are found at least as far north as the Georgia and 

 Carolina coasts, and part of them as far north as Cape Hatteras. 



Analytical Table of the Bermuda Genera. 



A. — Abdomen of male T-shaped ; carapace wide, thick, and strong ; marginal 

 teeth 8, besides onter orbital, all except last siibequal ; 8th stout and 

 sharp -. Callinectes 



A'. — Abdomen of male not T-shaped ; carapace weaker, less thick ; chelte slen- 

 der, prismatic. 



B. — Marginal teeth 8, snbequal, excejit last, which is generally longer or stouter; 

 flagellum of antennae included in the orbit, the antennal notch wide. 



C. — Carapace convex, nearly smooth, glossy ; ambulatory legs remiform and 

 fringed ; swimming legs without longitiidinal ribs and grooves on merus 

 and carpus ; merus of maxillipeds not prolonged Portunus 



C. — Carapace more depressed, usually with granulated transverse ridges, and 

 covered with short scale-like hairs ; ambulatory legs tapered, not evidently 

 remiform ; swimming legs flat, strengthened with longitudinal ribs and 

 hairy grooves on most or all the segments except basal, which is trans- 

 versely grooved ; merus fiat ; merus of maxillipeds prolonged beyond 

 insertion of flagellum .... Achelous 



B' . — Marginal teeth 8, alternately larger and smaller; last one not much elon- 

 gated; flagellum of antennae wholl.y or partly excluded from orbit; anten- 

 nal notch of orbit narrow Charybdella 



Callinectes Ordway, 1863. 



This genus embraces a considerable number of species of large, 

 very active, predaceous swimming crabs, most of which are American, 

 but a few occur on the West coast of Africa. They occur on both 

 coasts of America, in the temperate and tropical zones. Nearly all 

 the species are valued as food. 



The common "blue crab" or "edible crab" of the eastern coast 

 of the United States ( C. sapidas, formerly C. diacanthiis) is the 

 type. The species resemble each other pretty closely, and can best 

 be distinguished, in doubtful cases, by the form and length of the 

 male generative appendages, as was first pointed out by Ordway, in 

 his monograph of the genus. 



Four species have been taken at the Bermudas, but only one ( C. 

 ornatus) is common. Other species, especially C. tuniidus, may be 

 expected to occur, when the fauna becomes more fully known. 



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