240 Notes on North Americcm Crustacea. 



densely crowded, — the second long (a tenth of an inch), and nearly as 

 thick as the first, but fusiform, with pointed extremities, and sparsely 

 distributed over the surface, generally in groups of three or four, of 

 unequal lengths. Surface of the carapax beneath the setae crowdedly 

 granulated ; granules, however, not prominent ; sulci defining the areolets 

 not deep. Antero-lateral margin longer than the postero-lateral, regu- 

 larly curved, not sinuated as in D. hispida, and armed with five small 

 spines, not including that at the angle of the orbit. Front low- 

 triangular ; margin somewhat arched, and continuous with the superior 

 margin of the orbit, which forms a low projection opposite the juncture 

 of the cornea of the eye with its peduncle. In other characters this 

 species bears great resemblance to B. hispida, except that the dactyli of 

 the ambulatory feet are setose like the other joints, and have sharp, 

 black, much-curved unguicles. The color is more or less reddish or 

 crimson ; setae of a light golden color. Length of carapax in a female, 

 0.5 ; breadth, 0.6 inch. Males are somewhat smaller. 



This is an interesting addition to a genus, the species of 

 which are very few and rarely seen. In this genus the first 

 three pairs of ambulatory feet are alike, the third pair not 

 being reduced in size, as in Dromia, but rather larger than 

 smaller than the second pair. Those of the last pair are very- 

 small and weak, but not prehensile, since the animal does not 

 cover itself with a foreign body like the Dromiae ; and they 

 fill, apparently, no office in the economy of the animal, except 

 that when in place, they fill up neatly the chink between the 

 carapax and the stouter walking feet. 



D. Ursula was found at Cape St. Lucas by Mr. Xantus. 



^ EAKmOIDEA. 



Ranilia ang'ustata, nov. sp. 



Very closely allied to B. muricata, but with the carapax conspicu- 

 ously narrower, smoother, and more glabrous. Colors : carapax pale- 

 red in alcoholic specimens, closely maculated with white, the spots being 

 generally about one-fifteenth of an inch in diameter, but sometimes 



