General Catalogue of South African Crustacea. 355 



1907. D. b., Stimpson, Smithson. Misc. Coll., vol. xlix., p. 201, pi. 19 



(facing p. 166), fig. 2. 



" Dredged in twelve fathoms on a sandy bottom in Simon's 

 Bay, Cape of Good Hope." 



;: DIOGENES COSTATUS, Henderson. 



1893. Diogenes costatus, Henderson, Tr. Linn. Soc. London, Ser. 2, 

 vol. v., pt. 10, p. 418, pi. 39, figs. 7, 8. 



1908. D. c., Stebbing, S.A. Crustacea, pt. 4, p. 24. 



No. 239, sent by Dr. Gilcbrist, from Great Fish Point 

 Lighthouse, N. 4- W., 2^- miles, depth 55 m. 



* DIOGENES EXTBICATUS, n.n. 



1791. Cancer diogenes, Herbst, Krabben und Krebse, vol. ii., pt. 1, 



p. 17, pi. 22, fig. 5. 



Henderson, Tr. Linn. Soc., vol. v., p. 411, considers that prob- 

 ably several species are included under the name Cancer diogenes, 

 Linn., 1767, and that the species named Pagurus diogenes by 

 Fabricius in 1775 and 1787 was " unrecognisable, perhaps a 

 Pagurus." Since, then, Herbst's species is not necessarily identical 

 with any one of those covered by the Linnean name, and may 

 be generically distinct from that named by Linnaeus, the safest 

 plan is to consider Herbst's use of the name as void by preoccupa- 

 tion. Henderson, however, names a species Diogenes diogenes 

 (Herbst), which he identifies with Pagurus miles, Fabricius, 1798, 

 Milne-Edwards, 1837, and Diogenes miles, Dana, 1852. But be- 

 tween Dana's species and Herbst's there is a notable difference. In 

 Dana's, as Henderson well expresses it, " 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." In Herbst's figure the process only reaches the 

 top of the scales, and is spoken of as little, without any allusion 

 to denticulation. In this, as generally in other respects, our 

 specimen agrees with Herbst's figure and description. The 

 ophthalmic scales are fringed with a dozen graduated teeth. The 

 smaller cheliped of the right side is conspicuously beset with the 

 long yellow hairs which Herbst mentions. The carapace measures 

 20 mm. in the central line of its length. The pleon is missing. 

 No. 236, a male, sent by Dr. Gilchrist, was obtained off Seal Island, 

 W.S.W. (Mossel Bay). The specific name refers to the disen- 

 tanglement of the synonymy and the rescue of the species from a 

 tautologous designation. 



