A. E. Verrill — Decapod Crustacea of Bermuda. 3G5 



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

 raeshed seines in the shallow bays, and by the use of trawl-nets in 

 deeper water. 



We should naturall}^ expect to find there Charyhdella rubra, 

 Arenceus cribrarius, Acheldus spinicarpus, and Acheloxs 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 ; carajjace wide, thick, aud strong ; marginal 

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

 sharp Callinectes 



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

 der, prismatic. 



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

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



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

 fringed ; swimming legs without longitudinal ribs and grooves on merus 

 and carpus ; merus of maxillipeds not prolonged Portumis 



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 flat ; merns of maxillipeds prolonged beyond 

 insertion of flagellum .... Acheloiis 



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

 gated; flagellum of antennae wholly 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 ai'e 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. tumidas, may be 

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



