428 MK. J. E. HENDEESON — A CONTEIBUTION 



The antennal pedixncle is elongated, the penultimate joint being longest ; the flagellum 

 is long and naked. 



The chelipedes are long and snbequal, the right being but slightly la)'ger. The merus 

 is short and massive, graniilated above, and ■ndth a small projecting lobe on the inner 

 distal end of the upper surface ; on the right side there is a sharp moderately long spine 

 on the middle of the lower anterior surface. The carpus is about twice the length of the 

 merus, with the upper surface uneven but scarcely granulated, the anterior margin 

 moderately sharp and crenulated but without teeth, and the posterior margin rounded. 

 The hand is slightly granulated above, the granules being more numerous on the smaller 

 chela; the lower and outer surfaces, including both fingers, are densely pubescent. The 

 fingers are strongly curved at their apices, and even when closed there is a considerable 

 intervening hiatus ; a single tooth is present ou the immobile finger slightly beyond the 

 middle ; the mobile finger has a small basal tooth and is crenulated along the inner 

 margin, its upper surface is rounded and granvilated chiefly in the smaller chela. The 

 ambvilatory legs are long and slender, with the joints simply pubescent ; the dactyli are 

 entire, slender, and straight, about two thirds the length of the propodi, densely hairy 

 above, and with a sulcus on the antei'ior suriace. 



The carapace is 6"5 mm. long and 9*5 mm. broad, tlie right chelipede 23 mm. long, the 

 first ambulatory leg 14'5 mm. long. 



This little-known genus bears some resemblance to Polyonyx, from which it is distin- 

 guished by the form of the front, the smaller eyes, the longer antennal peduncle, longer 

 legs, and especially by the form of the ambulatory dactyli. The only previously known 

 species, H. ciliatus, Stm., from China and Japan, has the carapace flatter and narrower, 

 with the regions well defined ; the postero-lateral margin of the carapace carries two or 

 three spines, and the carpus of the chelipedes has a median row of tubercles on its outer 

 surface. 



Genus Pachycheles, Stimpson. 

 236. Pachycheles tomentosus, n. sp. (PI. XXXIX. figs. 16-18.) 



Kiu'achi ; four males, and five females all bearing ova {Brit. Mus.). 



The carapace is flattened, glabrous, and depressed anteriorly, with the regions not 

 defined, the protogastric lobviles slightly prominent, and the surface slightly uneven 

 towards the sides of the anterior branchial regions, which are raised above the level of 

 the lateral margin. A few faint lines or wrinkles cross the posterior rounded lateral 

 margin in passing to the under su.rface, and the remainder of the lateral border is defined 

 by a somewhat sharp entire convex edge ; opposite the penultimate joint of the antennal 

 peduncle is a shallow depression or notch in the margin. The front is depressed, 

 obscurely tridentate, and most prominent in the middle, with its upper surface densely 

 tomentose. The upper orbital margin is obtusely rounded, and the eyes are of moderate 

 size. 



The chelipedes are unequal, and either may be the larger ; they are granulated and densely 

 tomentose above, the hairs being arranged in short tufts. The merus has a denticulated 

 lobe on its inner and superior distal margin. The carpus is slightly convex and densely 



