340 DR. O. F. VON MOELLENDORFF ON [Juiie 2, 



his " AuIo2)oma" lowi is the same as my Cydotiis hungerfordianus. 

 It is decidedly a Gydotus and belongs to my group PLatyrhaphe 

 (Jahresb. Seiickenb. 1890, \}. 2%1 = Cycloti suturales, v. Mart.); 

 how it could have been mistaken for an Aulopoma is hardly to be 

 comprehended. I still think that the publication of a Gijclotus as 

 an Aulopoma does not entitle the name to priority, besides the 

 description is not sufficiently detailed and lucid. 



48. Opisthoporus solutus, Stol. 



Opisthoporus solutus, Stoliczka, J. As. Soc. Beng. xli. 1872, p. 2G6, 

 t. X. figs. 8-10 ; Crosse, J. de Conch, xxvii. 1879, p. 337 ; v. Molldff. 

 1. c. p. 307; de Morgan, Bull. p. 51. 



Bukit Pondong (Townsend, Rungei-ford) ; Mt. Tchora and Lano, 

 Kinta valley {de Morgan). 



Gydotus dautzenhergi, de Morgan, 1. c. p. .'iO, t. iv. fig. 1, from 

 Mt. Tchora near Ijioh, is, accoi ding to the figure given, undoubtedly 

 an Opisthoporus, and most probably identical with O. solutus, Stol., 

 which de Morgan quotes from the t^ame locality. 



49. Opisthoporus penangensis, Stol. 



Opisthoporus penangensis, Stoliczka, I.e. p. 26.o, t. x. fig. 7; 

 H. Crosse, 1. c. p. 338; de Morgan, Bull. p. 51 ; v. Molldff. 1. c. 

 p. 307. 



Bukit Pondong {Townsend, Hungerford) ; Perak generally {de 

 Morgan). 



Gydophorus lahatensis, de Morgan, Bull. p. 61, t. iv. fig. 7, from 

 the Kinta valley, is apparently a young shell, of 1 1 millim. diameter. 

 The author compares it to "Gydophorus'" penangensis, Stol., 

 meaning probably Opisthoporus penangensis, which species he had 

 mentioned 10 pages before. 



50. Rhiostoma joxjsseaumi, de Morgan. 



Rhiostoma jousseaumi, de Morgan, Bull. p. 52, t. iv. fiz. 2. 



Kinta valley. 



According to the description and the very meagre figure, the 

 clfissification of this species as a Rhiostomais not quite beyond doubt. 

 The detached last whorl and the tube connecting it with the penulti- 

 mate whorl render it rather probable, but the description of the 

 operculum does not mention the curious cup-shaped formation 

 characteristic of Rhiostoma. 



51. Pterocyclus regelspergeri, de Morgan. 

 Gydophorus regelspergei-i, de Morgan, Le Naturaliste, 1885, p. 69. 

 Pterocydus regelspergeri, de Morgan, Bull. p. 52, t. iv. fig. 3. 



1 Spiraculum regelspergeri, v. Molldff. 1. c. p 308. 



Upper Kinta valley {de Morgan); Larut {colL Lid. Mus.). 



De Morgan's mention of a tube behind the aperture is misleading 

 and made me suppose that the species belonged to Spiraculum. It 

 is not a proper tube, but only an enlarged " wing " typical of 

 Pterocydus. The species is very much like P. albersi, Pet. 



