{ G2 ) 

 I. Diogenes diogenes Herbst, Henderson. Plate XV,, fig. 3. 



Cancer diogenes, Herbst, Krabben, II. i. 1791, p. 17, pi. xxii., fig. 5. 



Diogenes diogenes, Henderson, Trans. Linn. Soc, Zool., (2) V. 1893, p. 412 



Pagtirus wiles, Fabricius. Ent. Syst. Suppl. 1798, p. 412 : .'Milne Edwards. Ann. Sci. 

 Nat. Zool. (2) VI. 1836, p. 284 [nee. pi. xiv., fig. 2]. 



Greatest breadth of carapace about three-fourths its length in the middle 

 line ; the anterior and antero-laterai borders more or less crenulate and 

 spinulose ; numerous spinules and transverse serrated setose ridges on 

 anterior half, and scattered vesiculous granules on posterior half of carapace ; 

 branchial regions with numerous tufts of setse. 



Rostrum much longer than ophthalmic scales, more than a third the 

 length of the eyestalks, its anterior half spinose. 



Eyestalks about four-fifths the length of the anterior border of the 

 carapace, only just surpassing the 2nd joint of the antennular, and hardly 

 reaching the middle of the terminal joint of the antennal, peduncle. 

 Ophthalmic scales large, the free edge spinulose. 



The antennal peduncle reaches to about the middle of the terminal joint 

 of the antennular peduncle : the antennal acicle is bifurcate, the opposed 

 edges of the forks being spinulose ; the outer (longer) fork just, or barely, 

 reaches the base of the terminal joint, the inner fork reaches about half-way 

 along the penultimate joint of the peduncle : flagellum nearly half again as 

 long as the carapace, sparsely setose near the base only. 



The chelipeds and legs are copiously and elegantly spinose, and the 

 edges of their joints also setose, the fingers of the smaller cheliped and the 

 dactyli of the 2nd and 3rd legs being thickly plumed. 



Left cheliped nearly twice as long as the carapace ; the merus, carpus 

 and palm of nearly equal length ; the carpus triangular and longer than 

 broad, and the palm a little broader than long : a sinuous groove on the upper 

 surface of the wrist and a broad oblique patch on the outer surface of the 

 palm are deficient in spines : the spines on the outer surface of the palm are 

 claw-shaped, The dactylus makes up two-thirds of the total length of the 

 hand and its spines are arranged in raised longitudinal rows (of which tv/o 

 in the upper part of the outer surface are particularly prominent), as they are 

 also on the propodites of the 2nd and 3rd legs. 



In the 2nd and 3rd legs the anterior edges of the joints are spinose and 

 the outer surfaces granulose, the propodites, as mentioned, being also fiuted 

 with rows of spines. The legs on the left side just exceed, those on the 

 right side exceed by about half their dactylus, the larger cheliped. The 

 dactyli in both pairs are more than half as long again as their propodites. 



