Ifotes on North American Crustacea. 181 



dactylns, which is very much curved and sharp. The posterior 

 feet are broadest. 



Length of the carapax, 0.44 ; breadth, 0.33 inch. 



Found at Cape St. Lucas, by Mr. Xantns. 



Pericera laevig'ata, nov. sp. 



Carapax elongated, convex ; surface pubescent and partly hairy, liair 

 crispate ; back and sides smoothly rounded, with no spines or tubercles 

 except a minute one on the intestinal region. Orbital tubes rather 

 large ; post-orbital teeth more prominent than the praeorbital, the dis- 

 tance between their tips equalling five- sixths of the greatest breadth of 

 the carapax. The rostrum forms between a fourth and a fifth of the 

 length of the carapax ; it is deflexed, curving downward, bifid, with the 

 horns united at base for one-third their length, then divergent. The 

 moveable part of the external antennae is longer than the rostrum ; the 

 spine of the basal joint is large, prominent, exposed from above, divergent 

 from the rostrum, and much nearer to the orbital tubes. In the chelipeds, 

 the meros-joint is armed above with obtuse spines ; the hands are rather 

 compressed, crimson in color; fingers with the distal half black, except 

 the tips, which are white. 



Length of the carapax in the male, 0.88 ; greatest breadth (pos- 

 teriorly) 0.49 inch. 



Inhabits St. Thoraas, West Lidies. A. H. Riise. 

 Pericera fosi^ata, nov. sp. 



Surface everywhere covered with a uniform short, dense, closely- 

 adhering pubescence. A few curled setas on the rostrum, and on the 

 concave antero-lateral slopes of the carapax. Lateral processes long, 

 blunt, and a little curved forward. The regions of the carapax are pro- 

 tuberant and separated by very deep sinuous pits or channels, appearing 

 somewhat as if eaten out; but the protuberances themselves are not 

 vermiculated. The rostrum is as long as the distance between the eyes ; 

 — the horns diverge, the distance between their tips equalling about 

 two-thirds that between the orbits. The spine of the basal joint of the 



