94 THE VOYAGE OF H.M.S. CHALLENGER. 



Genus Pagurodes, n. gen. 



Front with the rostral projection of moderate size. Ocular peduncles short ; the 

 ophthalmic scales spinular and separated by a considerable interval. Antennules long. 

 Antennal acicle strongly developed, the fiagellum long. Chelipedes slender and unequal, 

 the right larger ; fingers moving in a horizontal plane, and calcareous or but slightly 

 corneous at the tips. Ambulatory limbs with long and slightly tortuous dactyli, the 

 penultimate pair subchelate. Males with a short curved tubular organ (formed by the 

 protruded vas deferens) attached to the coxa of the fifth right leg. Abdominal segments 

 with the terga linear ; males with three minute appendages on the left side, of which the 

 first and second are uniramous, and the third is partially concealed by the appendage of 

 the penultimate segment ; females with four appendages on the left side, the first two of 

 which are biramous and oviferous. 



This genus agrees in some respects — particularly in the position of the protruded vas 

 deferens, — with Catapagurus, A. Milne-Edwards, from which it is, however, distinguished 

 by the form of the eyes, and the non-ciliated ambulatory dactyli, as well as by the tricho- 

 branchise. The shape of the chelipedes, the protruded vas deferens, and the absence of 

 genital appendages from the first two abdominal segments in the male, separate it from 

 Parapagurus, S. I. Smith. 



Pagurodes inarmatus, n. sp. (PI. X. fig. 5). 



Characters. — The anterior portion of the carapace is smooth and moderately convex, 

 with the median frontal j^rocess fairly prominent and acute, the lateral projections are 

 also acute and no less prominent ; the frontal margin is slightly raised, and a few slight 

 inequalities are seen towards the lateral margins ; the cervical groove forms a straight 

 line on each side of the carapace, placed obliquely to a deep transverse sulcus which 

 connects the two, and a deep sinuous depression runs immediately in front of and parallel 

 to each ; the posterior portion is entirely membranous. 



The ocular peduncles are short and compressed laterally, with a few haii-s on the 

 upper surface, and their bases swollen, the cornese are slightly dilated ; the ophthalmic 

 scales are short and spinulous, with their apices acute. The antennal peduncle exceeds 

 the ej^e-stalk by the length of its two last joints ; the acicle is strongly curved 

 and extends beyond the apex of the ultimate joint ; the second joint has a prominent 

 and acute external prolongation, as well as an acute spinule on the inner and distal 

 margin ; the first joint bears a minute spinule on its outer border ; the proximal 

 half of the fiagellum shows slight lateral compression. The antennular peduncle 

 exceeds the eye-stalk by the length of the ultimate and penultimate joints, the former 



