OBTSTACEA. 263 



trigonous merus-joint of the larger (left) chelipede is armed with 

 three or four spinules at its distal extremity : the carpus is but 

 little shorter than the palm and granulated externally, the granules 

 on the upper margin increasing in size to the distal end, where they 

 are spinuliform : the palm also is externally granulated and pubes- 

 cent ; the lower margin is in a straight line with the lower margin 

 of the immobile finger, and is armed with several much larger acute 

 spinules ; a few somewhat large granules exist also at the base of the 

 palm, and others are arranged in a longitudinal series along the outer 

 surface parallel to the upper margin, and also along the upper margin 

 of the palm and of the dactyl, which is about as long as the palm, flat- 

 tened externally, and fitting closely against the lower finger, having 

 on its inner margin near the base a rounded lobe, which is received 

 into a corresponding cavity in the inner margin of the lower finger. 

 The smaller chelipede has the slender wrist and hand clothed with 

 yellowish hairs ; the wrist armed above with small spinules arranged 

 in two longitudinal series. The second and third ambula'tory legs are 

 slender and thinly pubescent, with the dactyli arcuated and rather 

 longer than the foregoing joints. The fourth and fifth legs are sub- 

 chelate, the smaU dactyl impinging against the broad spongy pad 

 which terminates the penultimate joint. The filamentary appendages 

 of the postabdomen are clothed with long hairs. The left uropod only 

 is perfect ; it has the inner ramus larger than the outer. The colour 

 is whitish, with faint indications of pink upon the legs. Length of 

 the carapace about 4 lines (nearly 9 millim.), of the left chelipede 

 about 9 lines (19 mUlim.), of the third ambulatory leg about 11 lines 

 (23 miUim.). 



The single example in Dr. Coppinger's collection is from Prince 

 of Wales Channel, 7 fms. (No. 169). * 



This species scarcely differs from D.spinulimanus, Miers, except in 

 the longer slenderer rostrum, denticulated ophthalmic scales, and in 

 having the lower margin of the immobile finger in a straight line 

 with the lower margin of the palm (fig. c), whereas in the typical 

 D. spinulimanus the lower finger is bent downward and the oph- 

 thalmic scales subentire. In D. penicillatus the eyes are much 

 shorter, there is a median rostral spine, and the left chela has a 

 double series of spinules above. 



It may be distinguished from the species of Diogenes included in 

 Mr. Haswell's Australian Catalogue (pp. 156, 157) as follows :— 

 From D. miles, Fabr., by the much less spinulose chelipedes and 

 shorter tarsi of the ambulatory legs ; from D. custos, Fabr., by the 

 narrower, non-denticulated, rostriform appendage ; from B. granu- 

 latus, Miers, by the very different form and armature of the larger 

 (left) chelipede, &c.; and from D. senex. Heller, by the shorter 

 rostrum and eye-peduncles, which latter do not reach to the end of 

 the peduncles of the antennae, the different spinulation of the palms 

 of the cheUpedes, &c. 



