1879.] THE COREAN AND JAPANESE SEAS. 49 



One individual was collected at a depth of 100 fathoms, in lat. 

 41° 40' N., long. 141° 10' E. 



By the form of the ophthalmic scales, the dilated carpus of the 

 right anterior leg, and the externally concave palm of the left ante- 

 rior leg, this species is easily distinguishable from its congeners. 



It does not seem to be allied in any close degree to any of the 

 species described by Stimpson from the Chinese and Japanese seas. 

 In Eupagurus forceps, M.-Edw., a Chilian species, which has the 

 wrist of the larger hand strongly cristate above and beneath, the 

 fingers of the smaller hand are described as being very long, slender, 

 and acute, whereas in E. cavimanus they are of moderate length. 



There are a few other specimens of Paguridea in the collection, 

 which, being in mutilated condition, cannot be determined with 

 certainty. One, obtained at the Goto Islands at low-water mark, 

 has lost the postabdomen and one of the anterior legs, but is perhaps 

 referable to the Pagurus lanuginosus of De Haan. Another, which, 

 like Pomafocheles jeffreysii, inhabited a shell of Dentalium, is too 

 imperfect to be described. 



PoMATOCHELES, gen. nov.^ 



Cepbalothorax and its appendages as in the Paguridce. Carapace 

 with a median frontal lobe, and postfrontal and other sutures j pos- 

 teriorly it is partly membranaceous. Postabdomen as in the Ma- 

 crura, extended, straight, with parallel sides, composed of seven 

 distinct segments, interiorly closed by two longitudinally-folding 

 membranaceous flaps, which meet in the middle line. Eye-peduncles 

 slender, cylindrical, straight. Autennules and antennae rather short, 

 the latter with simple multiarticulate flagella. Antennal aciculum 

 small. Outer maxillipeds subpediform. Anterior legs (as in Cancel- 

 lus) equal ; hands bent obliquely downwards from the wrists, and flat- 

 tened above, fingers opening horizontally, and acute at tips. Second 

 and third legs slender, elongated, terminal joints long, straight, and 

 acute. Fourth and fifth legs small and weak ; last joint of fourth 

 pair with a small terminal claw, and that of the fifth pair with a tuft 

 of hairs and minute claw at its distal end. Postabdominal appen- 

 dages of the second to fifth segments slender, those of the second 

 segment elongated, and 4- or 5-jointed, the rest short. Appendages 

 of the penultimate segment (uropoda) with two lamellate unequal 

 rami. Telson membranaceous in its distal half, and divided by a 

 terminal notch into two rounded lobes. 



I have much pleasure in dedicating the single species of this re- 

 markable genus to Dr. J. Gwyn Jeff'reys, F.R.S., by whom the 

 entire series of Crustacea collected by Capt. St. John was presented 

 to the British Museum. 



PoMATOCHELES JEFFREYSII, Sp. U. (Plate III. fig. 2.) 



The animal is slender and elongated. The carapace is marked 



1 'TTwfia, a lid, and x^^^'h ^ claw. 



PROC. ZooL. Soc— 1879, No. IV. 4 



