ACADEMY OF SCIENCES. 69 



Var. Icevis. 



Rostrum, orbits, antero-lateral spines, and limbs exactly as previously de- 

 scribed, but the carapax more broadly ovate, and without tubercles, and the 

 chelipeds much larger in the male. 



M. M. 



Length of carapax '. 21 



Greatest width at fourth antero lateral spine 19 .5 



Length of first pair 30 



This is a well-marked species, and exceedingly elegant in appearance. The 

 male which I have described as var. lavis is the largest among several from 

 various localities. The smooth carapax and laige chelipeds render it con- 

 spicuous among the others, yet I am inclined to believe these characters only 

 varietal, and not improbably only individual. 



No. 20. Male and female, in spirits. Gulf of California. Fisher and 

 Lockington. 



CHORININ.2E. 



16. Chorilia longipes. Dana. U. S. Ex. Exp., 1, p. SI, pi. 1, fig. 5. Stimp- 



son. Crust, and Echi. Pac. S. N. A., 14. 



17. Sci/ra acutifrons. Dana. U. S. Ex. Exp ., vol. I, p. 95, pi. 11, f. 2 



Stimpson. Crust, and Echi. P. S. N. A., 15. 



No. 7. A single dried specimen from San Diego, by Henry Hemphill, 

 caught between tides. 



Chorillbinia. nov. gen. 



Rostrum long, broad, and emarginate at tip as in Libinla, but the eyes con- 

 cealed beneath it as in Chorinus and its allies. Pie- and post-orbital spines 

 acute, separated above and below by an acute fissure, aud together constituting 

 the orbit. Carapax triangular. 



18. Chorilibinia angustus. nov. sp. 



Carapax triangular, narrowing gradually to the region of the eyes, the or- 

 bits of which are salient. Rostrum long, emarginate at tip, the bifurcation 

 divergent, extending only one-third the length of rostrum. Fixed joint of 

 external antenna? terminating outwardly in a long spine which precedes the 

 pre-orbital when looked at from above. Pre-orbital spine large, acute, sep- 

 arated from the acute post-orbital by an acute fissure, both above and below. 

 Antero-lateral margin with three spines beside the post-orbital, the largest 

 spine at the angle between antero- and postero-lateral margins. Tubercles of 

 carapax prominent, each culminating in a single spine. A tubercle with 

 spine on the posterior angle. Movable basal joints of outer antennas setose, 

 slender, cylindrical. Chelipeds slender, about the same length as second 

 pair; merus (arm) with four tubercles above; manias smooth, slender; dactyli 

 small, slender, in contact most of their length, serrate on inner border. Four 

 hinder pairs rounded, slender, second much the largest; claws sharp. 



