CALIFORNIA STALK-EYED CRUSTACEA. 53 



may be easily distinguished from that species by the 

 greater convexity and smoothness of the carapace, the 

 character of the antero-lateral teeth and its smaller size. 



Genus Trichocarcinus Miers. 



(Trichocera DE HAAN preoccupied.) 



Carapace cancroid in form, the sides rounded; antero-lateral margins not 

 sharply marked off from the postero-lateral; upper surface very uneven. 

 Front with five teeth. Antennules nearly longitudinal. Antennae quite 

 long, setose on all sides, the first joint elongated and occupying the inner 

 orbital hiatus. Abdomen of the female seven- jointed; in the male five- 

 jointed, the third, fourth and fifth joints fused. Crabs of small size. 



Type. T. gibbosula (DE HAAN.) 



Although this genus was formerly placed among the 

 Corystoid crabs it is in many respects, as Miers has 

 observed, quite closely allied to the genus Cancer. Can- 

 cer antennarius shows many characters in common with 

 this genus. 



Trichocarcinus Walkeri (new name). 



Trichocarcinus recurvidens WALKER, Trans. Liverpool Biol. Soc., Vol. XII 

 1898, p. 271, PI. XV, figs. 1-16. 



" Carapace 19 mm. long by 23 mm. wide, divided into a number of promi- 

 nent areolaa of which the surfaces are flattened and granulated; they are 

 separated by deep interspaces. * The antero- and postero-lateral 



margins are ill defined; the former has ten teeth (including the orbital) 

 which are convex on the upper surface, widening distally, and inclined 

 upwards, whence probably the specific name. * ' * Eye-stalks short with 

 a bifid calcareous appendage on the upper and inner side. * Differs 



from T. oregonensis (Dana) in the flatter, more sharply defined areolaa, in 

 the distal expansion of the teeth of the antero-lateral margin, and in the 

 different form of the calcareous ocular appendage. Color of areolse bright 

 red, chelipeds and legs flesh color, fingera black. One male." 



Puget Sound. 



