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NOTE ON THE SPECIES OF CYGLOPHORUS FOUND AT HONG-KONG. 

 By Staff-Surgeon Kenneth H. Jones, R.N. 



Read I2th March, 1909. 



During a period of service extending over three years recently spent 

 at Hong-Kong, I collected several hundreds of a species of Cyclophorus, 

 which, as far as I can ascertain, is the only one of the genus to be 

 found there. 



Mr. J. H. Ponsonby has also been unable to find more than one 

 species in the island. The following are the most important references 

 to the occurrence of Cyclophorus at Hong-Kong : — 



Kobelt (Tierreich, Cyclophoridae, pp. 138, 142) states that C. punc- 

 tatus, Grat., and C. exaUatus, Pfr., are found at Hong-Kong. 



Mollendorff (Jahrb. deutsch. Malak. Ges., 1882, p. 266, pi. ix, 

 fig. 3) quotes C. exaltatus, Pfr., from Hong-Kong (from Happy Valley, 

 Sheko, and Little Hong-Kong). 



Dr. E. von Martens (Preuss. Exped. Ost. Asien, p. 39, pi. xix, 

 fig. 8) gives C. exaltatus, Pfr., from Hong-Kong, and mentions that it 

 was taken there by Mr. Fortune and also by himself. 



C. exaltatus, Pfr., was described from a shell in the Mus. Cuming, 

 locality unknown, and Reeve (Conch. Icon., Cyclophorus, species 24) 

 considers it to be "a small C. volvulus.'''' C. punctatus, Grat., does 

 not occur at Hong-Kong, but is common at Canton, and I have also 

 taken it at Hoi Ha, on the mainland, about 40 miles to the east of 

 Hong-Kong. No doubt, if the country is ever properly worked, it will 

 be found elsewhere. C. exaltatus, Pfr., is described as having the lust 

 whorl " obtuse angulatus," but in all the specimens of the Hong-Kong 

 species that portion of the shell presents a well-marked keel, Avhich 

 can be readily seen and felt. On examination of actual specimens of 

 C. exaltatus, Pfr., collected by Mr. Fortune in China, it is found that 

 the periphery of the last whorl is almost, if not quite, rounded, 

 certainly presenting nothing resembling the carination so obvious in 

 the Hong-Kong species. 



It was noticed by von Martens that the specimens of Cyclophorus 

 which he collected in Hong-Kong were angulated and not rounded on 

 the last whorl. 



Mollendorff states that C. exaltatus, Pfr., is about as much keeled 

 as C. punctatus, Grat., but the latter certainly presents nothing at all 

 resembling carination. 



The probability is that Mr. Fortune collected his specimens of 

 C. exaltatus, Pfr., either in the Northern or Central Provinces of the 

 Chinese Empire, hundreds of miles from Hong-Kong, but that by some 

 error the last-named locality has been ascribed to them. Indeed, 

 Mollendorff writes that "as only one species of Cyclophorus is found 

 in Hong-Kong, he does not doubt, any more than von Martens did, 

 that it is C. exaltatus, Pfr., always assuming that that species really 

 was taken by Mr. Fortune in the island." 



