A. E. Verrill — Decapod Crtistacea of Bermuda. 335 



Siiperfamily or tribe CYCLOMETOPA = CANCROIDEA (see p. 14). 

 Family Pilumnid^. 



Key to the Bermuda genera of the famih/ Pihunnidce.* 



A. The ridges that define the efferent branchial channels, if present, are usually 

 low and ai-e confined to the posterior part of endostome, never 

 reaching to anterior boundary of buccal cavern. 

 B. Fronto-orbital border less than half the greatest width of carapace. 



C. Antero-lateral borders of carapace sharp, crest-like ; upper border at least 

 of arms, and of fourth, fifth, and sixth segments of legs sharp and 



crest-like -.. Platypodia 



C. Antero-lateral borders of carapace and upper borders of legs not crest- 

 like 

 D. Antero-lateral borders divided into lobes or teeth. 



E. Carapace usually conspicuously lobulate, granulate, and hairy, che- 



lipeds and legs also granulate and hairy Actma 



E'. Carapace, chelipeds, and legs not sharply granulate and hairy. 



F. Fingers sharp-pointed, not hollowed Cycloxanthops 



F'. Fingers blunt-i^ointed, hollowed at tiji Xanthodius 



B'. Fronto-orbital border half or more than half the greatest width of the 

 carapace. (True of American species of Liomera.) 

 C. Carapace transversely oval. 



D. Ambiilatory legs with upper margins of the carpal joint bearing a 



horned or lunate crest _ . Heteractoea 



D'. Ambulatory legs with upper margins smooth or nearly so. 



E. Antei'o-lateral teeth strong, greatly projecting. Carapace deeply 



areolated Leptodius 



E'. Antero-lateral teeth small, little projecting. Carapace slightly or 

 not at all areolated. Carapace without transverse granulated lines. 



Fingers somewhat hollowed at tip -- Liomera 



C. Carapace more or less hexagonal, or subquadrate. 

 D. Ambulatory legs spinulose. 

 D'. Ambulatory legs not spinulose. 



F. Front of moderate width. Postero-lateral margins not strongly 



converging . - Eupanopeus 



A'. The ridges that define the efferent branchial channels extend to anterior 

 boundary of buccal cavern and are often very strong. 

 B'. Fronto-orbital border just about half or less than half greatest breadth of 

 carapace, which is broad and transversely oval. 

 C. The basal antennal joint does not nearly reach the front. 

 C. The basal antennal joint reaches the front. 



D. Anterior margin of merus of outer maxillipeds not noichedi -Eurytitim 



* This table is taken from that of Miss M. J. Eathbun (Brachyura and Mac- 

 rura of Porto Rico), with some alterations and omissions. It includes two addi- 

 tional genera {Heteractcea and Lohopilumnus). 



