98 THE VOYAGE OF H.M.S. CHALLEXGER. 



ambulatory dactyli, at ouce distiuguisli this species from Pagurodes inarmatus, to which 

 it is ill other respects closely related. The single male specimen is without the 

 protruded vas deferens, but as it is otherwise mutilated it is possible that this organ has 

 been accidentally removed. 



Habitat. — Station 214, south of the Philippines; depth, 500 fathoms; bottom, blue 

 mud. A male, in a shell of Pleuroto7na sp. 



A minute Pagurid found in the shell of a species of Pleiirotoma from Station 73, near 

 the Azores; depth, 1000 fathoms; bottom, Pteropod ooze, is probably referable to the 

 genus Pagurodes. It is, however, in too imperfect a condition for satisfactory identi- 

 fication. 



Genus Paguropsis, n. gen. 



Front with a prominent rostral projection. Ocular peduncles stout ; the ophthalmic 

 scales minute and separated by a considerable interval. Antennules of moderate length. 

 Antennal acicle of small size ; the flagellum of moderate length. Chelipedes subequal 

 and well developed ; the fingers moving in a horizontal plane, slightly corneous and 

 excavated towards the tips. Ambulatory limbs compressed and of moderate length, with 

 long, slender, and tortuous dactyli ; the last two pairs chelate and subdorsal in j^osition. 

 Abdomen short and simply bent, the terga membranous and of moderate width ; males 

 with two jiairs of genital appendages on the ventral aspect of the first and second 

 segments, and a minute uniramous appendage on the right side of the third and fourth 

 segments respectively ; females with a pair of appendages on the first segment, and three 

 biramous appendages of large size on the right side of the second, third, and fourth 

 segments, enclosed in a spacious marsupial pouch. 



The characters of this interesting genus are in many respects peculiar, indeed two of 

 these are sufiicient to give it a unique position among Hermit Crabs, viz., the subdorsal 

 position of the last two pairs of thoracic legs, and the presence of the unpaired abdominal 

 appendages on the right side. Among the Pagurids generally, the soft abdomen, as 

 a result of its being thrust into a Gastropod shell the spiral of which is normally right 

 handed, has assumed a similar curve, and the original right side thus closely applied to 

 the columella loses its appendages. In the species described below there is nothing to 

 indicate the nature of the habitation selected by the animal, and an examination of the 

 abdomen leaves little doubt that it must have been protected in some way ; the presence 

 of the abdominal appendages on the right side, and the fact that the abdomen is simply 

 bent on itself, render it probable that in this case a Gastropod shell has not been 

 selected. 



