412 ME. J. R. HENDERSON — A CONTRIBUTION 



miles is now termed Pagurus diaphanus, and what is probably tbe Cancer Diogenes of 

 Herbst is termed Pagurus miles. A new species, Pagurus custos, appears in this work 

 for the first time, and there can be little doubt that it represents the very common Indian 

 species which Milne-Edwards and others identified from Eabricius's short diagnosis. 

 De Man, in his Report on the Mergui Crustacea, has referred to the Pagurus miles of 

 Eabricius the species which I follow Milne-Edwards in regarding as P. custos, Fabr. ; this 

 determination was based on an examination of the type of the former, which is unfortu- 

 nately in a fragmentary state and some of the most important parts are missing, but I 

 imagine there has been some mistake in connexion with the labelling of the specimen, 

 for it does not agree with Eabricius's later diagnosis of P. miles. An examination of 

 types is not likely to be of much service in this case, for it appears almost certain that 

 Eabricius described two distinct species under the name of P. miles. 



The species described by Milne-Edwards in the ' Histoire Naturelle des Crustaces ' as 

 P. miles, P. custos, and P. diaphanus are, in my opinion, identical with those so named 

 by Eabricius in the ' Supplementum Entomologise Systematica?,' and, as I have pointed 

 out, Herbst's earlier names must be adopted in the case of two of these. 



207. Diogenes Diogenes (Herbst). 



Cancer Diogenes, Herbst, Naturges. Krabben u. Krebse, Bd. ii. Heft 1, p. 17, Taf. xxii. fig. 5 (1791). 

 Pagurus miles, Eabricius, Suppl. Ent. Syst. p. 412 (1798) ; Milne-Edwards, Hist. Nat. Crust, t. ii. p. 235 



(1837). 

 Diogenes miles. Dana, Crust. U.S. Explor. Exped. pt. i. p. 439, pi. xxvii. fig. 9 (1852) ; nee D. miles, 



De Man. 



Rameswaram and Tuticorin (Thurston). Common at Madras and on the S. Indian coast 

 generally (J. R. S.). 



The ophthalmic process is narrow and elongate, exceeding the ophthalmic scales by almost 

 half its length, and the distal half is armed with well-developed lateral spinules. The 

 eye-stalks are slender and faintly curved, slightly exceeding the penultimate joint of the 

 antennal peduncle ; the outer border of the ophthalmic scales is straight for the greater 

 part of its course, and armed with minute spinules which increase in size towards the 

 apex of each scale. The antenna! peduncle is elongated ; the antennal acicle is bifurcate 

 and minutely spinose, with the outer process considerably longer than the inner, and 

 extending almost to the distal end of the penultimate peduncular joint ; the flagellum is 

 rather long and sparingly pubescent. The antennular peduncle is elongated, exceeding 

 the antennal peduncle by almost half the length of its terminal joint. 



The hand of the left chelipede is armed externally and on its upper and lower margins 

 with strong, blunt, pointed spines, which are, however, deficient on an oblique area 

 extending from the carpo-propodal articulation to the base of the immobile finger ; the 

 dactylus is armed with two rows of similar spines— one on the upper border and the other 

 on the outer surface. The ambulatory legs are strongly pubescent, more especially their 

 dactyli, and the anterior surface of the three terminal joints is armed with short horny- 

 tipped spinules, which are arranged in three rows on the propodus. 



The total length of the body in a full-grown adult is about 60 mm. 



Distribution. Indian Seas (Fabricius, Milne-Edwards, &c.) ; Madras and Nicobars 



