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border of the four terminal joints of the 2nd and 3rd legs — are spinose or 

 spinulose, the exposed surfaces of these appendages are finely and copi- 

 ously granular, they are also much barer of setae. On the upper border of 

 the dactylus of the left cheliped there is only one longitudinal comb of 

 enlarged serrations. The granules on the outer surface of the propodites 

 of the 2nd and 3rd legs are arranged in close-set, transverse, almost squami- 

 form, series. 



The species inhabits all sorts of wide-mouthed, often encrusted, shells. 

 Distribution : Seas of India, S.-E. coast of Australia, to 18 fathoms. 



J. Barnett. 



■ " Investigator.'' 



Messrs. Milner, Daly, and West. 

 J. ADderson. 



3^. Diogenes custos var. affinis Henderson. Plate VI., fig. 2. 



Diogenes affinis, Henderson, Tr. Linn. Soc, Zoo.I, (2) V. 1893, p. 415, pi. xxxix., flg. I, 2 : 

 Nobili. Boll. Mus. Torino, XVIII. No. 452, 1903, p. 15. 



Diogenes custos, Dana, U. S. Expl. Bxp., Crust, pt. I. 1852, p. 439, pi. xxvii., fig. 10 a-g. ? 

 PStimpson, Proc. Ac. Nat. Sci. Philad., (1858) 1859, p. 245 : ?Hess, Archiv f. Nat. xxxi. 1865, 

 i. p. 161: PHaswell, Cat. Austral. Crust. 1882, p. 157: Henderson, Challenger Anomura, 

 1888, p. 53: POrtmann, ZooU Jahrb., Syst. VI. 1892, p. 294. 



This form differs from typical D. custos in the following particulars :— 

 The rostrum is shorter, being little longer than the ophthalmic scales. 

 The antennular peduncle is often distinctly shorter than the antennal 

 peduncle. 



The inner fork of the antennal acicle is so short that the acicle can 

 hardly be called bifurcate, nor does the outer fork reach to the base of the 

 terminal joint of the peduncle. 



The antennal flagellum is not much more than half the length of the 

 carapace, and is thickly setose almost to the tip. 



In the left cheliped the hand is shorter and broader, the dactylus does 

 not make up two-thirds the total length of the hand, and the lower edge of 

 the fixed finger is sinuous. 

 9 



