154 CALIFORNIA ACADEMY OF SCIENCES. 



Holopagurus pilosus, sp. nov. 



Anterior portion of the carapace slightly wider than long, eroded at the 

 front and sides, and having a few short spinules near the antero -lateral 

 margin. Frontal margin transverse, rostral projection represented by a 

 small prominence which does not exceed the lateral ones. Ocular pedun- 

 cles cylindrical, rather slender, and about two-thirds the length of the 

 anterior portion of the carapace; corneae not dilated; basal scales very 

 wide at base, their inner sides produced forwards into a subacute, triangu- 

 lar lobe. Antennular peduncle about equalling the eye-stalks. Peduncle 

 of the antennae shorter than the eye-stalks, the second joint with a short 

 spine at the antero-exterual angle bat none at the antero-internal angle; 

 last joint of the peduncle short, less than twice as long as wide; acicle 

 straight, ciliated, evenly tapering to an acute tip, convex and roughened 

 above, and not reaching the tip of the peduncle; flagellum shorter than 

 the carapace and thickly set below with long hairs. Chelipeds of similar 

 form, furnished with long hairs and short spines; merus trigonous, the 

 lower side flattened, the upper edge sharp; carpus armed with short, scat- 

 tered spines on the upper surface which is convex, rounding off insensibly 

 to the small outer face; inner face flattened and separated from the upper 

 surface by a rather sharp edge which is armed with sharp spines and 

 turns outward near the base more sharply on the left cheliped than on 

 the right; hands horizontally flattened, the upper surface gently convex 

 and covered with scattered spines which are larger and more thickly set 

 near the rounded margins; the larger hand is widest across the base of the 

 fingers, beyond which it is quite abruptly contracted; the pollex is rather 

 narrow a short distance beyond the base, its inner and outer margins 

 rounded, the tip corneous; dactyl subconical, the tip corneous and strongly 

 curved, its surface thickly set, like the pollex, with short, corneous spines. 

 The smaller hand is relatively narrower than the larger one, the inner 

 and outer faces parallel; pollex not so much contracted beyond the base 

 as in the larger hand, its outer margin evenly convex near the base and 

 not slightly concave like that of its fellow. Ambulatory legs hairy and 

 armed with spines on the upper sides of the merus, carpus and propodus; 

 propodi subcylindrical, nearly smooth below; dactyls long, gently curved, 

 flattened towards the tip, subcylindrical at the base, about twice the 

 length of the upper side of the propodi, strongly twisted, and armed only 

 with very short, corneous spinules. Dactyl of the fourth pair of legs 

 extending for about one-third its length beyond the propodus. Coxae of 

 the last pair of legs separated by an oblong process of the sternum on the 

 posterior side of which is a sharp, median groove. Abdominal append- 

 ages long and hairy. 



The posterior portion of the carapace is more or less calcified, especially 

 over the cardiac area, and the branchial regions are reticulated with mem- 

 branous lines. 



