( 72 ) 



The left cheliped is shorter, being, in the adult female, not half again as 

 long as the carapace, and the edges of all its joints are considerably setose : 

 on the lower inner border of the merus there is a single large spine : the 

 merus is as long as the carpus, and the carpus a little longer than the palm : 

 the palm is higher than long and the fixed finger is not deflexed. As in 

 D. redimanus, the whole outer surface of the left hand is granulous, the spines 

 on the lower edge of the hand are continued on to the fixed finger, and there 

 is a longitudinal row of spines in the upper part of the outer surface of the 

 palm, but no oblique crest in the lower part. 



The legs, although their edges are setose as in D. costatus, are practically 

 smooth, there being only a few inconspicuous spinules at the far end of the 

 upper border of the carpus. 



From D. redimanus it is distinguished in the following particulars ; — 



The free edge of the ophthalmic scales is spinose throughout. The 

 antennal and antennular peduncles are of equal length: the antennal fiagel- 

 lum is coarser and shorter, and the antennal acicle is shorter. 



The left cheliped is shorter and has a much broader hand ; the upper 

 border of its merus is serrulate and the inner lower border is armed with a 

 large spine at its proximal end. 



Length of carapace of adult female 12 millim. 



4722 



-i^. OS Vizagapatam coast, 20 fath. " Investigator." 



9. Diogenes bicristimanus, n. sp. Plate VII , fig. i. 



This species also is very similar to D. costaius, from which it differs only 

 in the following particulars : — 



The carapace is narrower and more elongate. 



The antennal acicle falls a good deal short of the base of the terminal 

 joint of the peduncle: the antennal fiagellum is considerably longer than the 

 carapace and carries only a few lank setae. 



In the left cheliped the merus is a little longer than the carpus, and has 

 the upper border ill-defined and the lower border not serrulate : the anterior 

 border of the carpus is not spinose : the whole outer surface of the hand is 

 granulous : a broad longitudinal ridge runs without a break along the middle 

 of the outer surface of the palm and is continued downwards to the tip of the 

 deflexed fixed finger ; above this is a second obliquely-longitudinal ridge not 

 quite reaching to the dactylus ; while below it is a distinct trace of the begin- 

 nings of the oblique ridge seen in D. costatus : the lower edge of the fixed 

 finger is serrated. 



