14 J.El'TOPODIAD.E. 



at Wcymoutb, from which locality he designated it Cancer 

 Dorsettensis. His work was published in 1777 ; and the 

 Eotomologia Systematica of Fabricius, in which it first re- 

 ceived the name of C. Scorpio, not until 1793. The Fab- 

 rician name has recently been adopted by Dr. Milne 

 Edwards, as it had previously been by Desmarest, probably 

 from some objection to the local origin of the former name ; 

 this, however, is quite admissible in the present instance, 

 as indicating the locality in which it was first discovered. 

 At all events, it is not more objectionable than the other. 



The carapace of this species is triangular, rounded poste- 

 riorly, and ventricose. The rostrum is very short and 

 bifid ; the orbits oval, so that the eyes, which are attached 

 by their peduncles to the anterior portion of the orbit, can 

 be laid backwards into the posterior portion of that cavity ; 

 a character which belongs to most of the genera of the 

 triangular or oxyrynchian families. The eyes are protected 

 by a spine on the anterior, and a stronger one on the 

 posterior margin of the orbits, of whicli the upper margin 

 is also raised, and the inferior, formed by the basal joint of 

 the antenna?, slightly tuberculated. The external antennre 

 are short ; the moveable portion not much exceeding twice 

 the length of the rostrum. There are four small tubercles on 

 the anterior part of the carapace arranged transversely, and 

 one much larger behind them, on the centre of the gastric 

 region; there are two tubercles on each branchial region, 

 one at the anterior part and another rather larger on the 

 centre ; there is also a conspicuous one on the cardiac region. 

 The external pedipalps are elongate, the second joint being 

 much produced anteriorly at the inner angle ; and the third, 

 which is somewhat triangular, has the inner and anterior 

 angle truncated, for the articulation of the terminal portion, 

 which consists of three joints. The anterior pair of legs in 



