220 SMITHSONIAN MISCF.LLAXEOUS COLLECTIONS 



able numbers molds its corneous base over the body of the crab, re- 

 ceiving for its reward and sustenance the fragments which float off 

 at the banquet of its voracious companion, as well as free transporta- 

 tion along the sea bottom. The shell thus formed is spiral, with de- 

 pressed whorls, laxly convoluted and resembling somewhat a Del- 

 pliimda, and often about an inch and a half in length. It is exter- 

 nally muricated with stout processes from one-tenth to one-half an 

 inch in height, one-twentieth in thickness, and more or less branched 

 at the top. Embedded in its apex we find the minute shell, seldom 

 over one-third of an inch in length, which served the hermit for a 

 cell when young. 



The same thing was observed by J. E. Gray (see Zoologist, i, 

 204) to occur sometimes with the common Bupaguriis bernhardus; 

 and on our own coast shells inhabited by Pagurl are often seen leav- 

 ing the margin at the mouth, continued out to some extent by the 

 addition of the crustaceous or coriaceous polypidom of Hydrac- 

 tinicc. With Blip, constans, however, this is a constant character- 

 istic, and to such an extent that the entire shell seems to be composed 

 of the adventitious substance. 



Several specimens of this curious species were dredged from^ a 

 rocky bottom in four fathoms in Hakodadi Bay, Northern Japan. 



339. EUPAGURUS PECTINATUS ' Stimpson 



Bupagurus pectinatns Stimpson, Proc. Acad. Nat. Sci. Phila., x, p. 249 

 [87], 1858. 



On the anterior part of the carapax there are two series of fas- 

 cicles of hair, as in B. constans, enclosing an oval naked space at the 

 middle; also two or three scattering tufts outside of this space pos- 

 teriorly. On the posterior part there are some tufts on the median 

 and postero-lateral surfaces. Rostriform point small but very acute, 

 and not much projecting. Lateral points or teeth of front acu- 

 minated, their tips spiniform, directed a little outward, and project- 

 ing nearly as far forward as the rostrum. Eyes long and slender, 

 reaching to the tips of the peduncles of the antennae and overreach- 

 ing the hairy acicle ; cornea not dilated. Ophthalmic scales with 

 slender acuminate apex. Flagellum of antennse reaching beyond 

 the tips of the chelipeds ; joints minute, setose. Chelipeds consider- 

 ably shorter than the ambulatory feet ; meros with smooth or slightly 

 squamous surface, and with its anterior margin armed above with 

 2—4 parallel spines like the teeth of a comb ; carpus and hand spinous 



^ Pagitrits pectinatns (Stimpson). 



