8 Crustacea and Echinodermata of the 



to Philadelphia for that purpose, to examine the typical 

 specimens of Randall's species, and those of De Saussure. 

 To Professor Dana I am indebted for much assistance, and 

 for the use of the few specimens of his types which were 

 particularly desired for comparison, — the admirable exact- 

 ness of his figures and descriptions rendering any further 

 means of identification in most cases unnecessary. 



Full descriptions will be here given of the new species 

 only, but notes are appended to several already known, 

 including remarks on characters which have been over- 

 looked by previous authors. Enough is given in most 

 instances to enable the reader to determine any known 

 California or Oregon species. 



DECAPODA BRACHYURA. 



Tribe OXYRHYNCHA. 



CIIIONcECKTES CEHRINGIANUS. SUmpSOfl. 

 Chioncecctcs Bchringianus, Stimpson ; Proc. Bost. Sue. Nat. Hist. vi. 84. 



Carapax with numerous scattered unequal rugose prom- 

 inences which are blunt and wart-like about the middle, but 

 become more acute anteriorly and at the sides. Superior 

 surface covered with a short pubescence. The broad chan- 

 nels above the postero-lateral margins are nearly smooth, 

 but their double margins are granulated. The inferior an- 

 terolateral margin is armed with about fourteen small bifid 

 teeth which diminish in size forwards. The feet are every- 

 where slightly pubescent, with the third articles scabrous or 

 echinulate above ; those of the first pair are muricated along 

 the angles, and everywhere somewhat scabrous on their 

 upper surfaces. The abdomen in the male is one third the 

 width of the sternal plastron at its penultimate article, the 

 infero-lateral angles of which are somewhat produced and 

 tumid. Length of the carapax, 2.5 ; width, 2.52 inch. 



