1871.] F. Stoliczka — Notes on terrestrial Mollusca. 1.55 



x, fig. 9). This species has the general form, usual costulation of the 

 whorls, and the coluinellar tooth of Diplommatina, but no apparent 

 constriction at the termination of the penultimate whorl. Only 

 if this last character should prove constant, could the subgeneric 

 name be retained, though this seems to be rather doubtful. Mous- 

 son recently (J. de Conch. 1870, p. 188, pi. viii, fig. 9), described 

 from one of the Viti islands a If. fuscula. It is about as much 

 elongated as the type species, smooth, but the constriction on the 

 penultimate whorl is distinctly perceptible ; therefore this species 

 does not differ in any essential point from Diplommatma. 



In 1864, E. v. Martens suggested the name Diancta for a sinis- 

 trorse species from Ternate, distinguished by a very marked 

 constriction of the penultimate whorl, hence the specific name 

 D. constricta (vide Moll, der Preuss. Exp. nacli Ost-Asien, p. 164). 

 The same author states (ibidem) that Diplommatina has no 

 columellar fold, which is evidently a mistake, for its existence 

 had been recorded in many of the Indian species then known, but 

 no figures were published. D. constricta does not possess a columellar 

 fold or tooth ; it is probably situated far internally, but the con- 

 striction evidently indicates that the columella must be strongly 

 twisted. Besides Adam's Diplommatina Martensi there have been 

 (J. de Conch. 1870, p. 180 et seq., pi. viii,) several species lately 

 described by Mousson under the subgeneric name Diancta. They are 

 all sinistrorse, like the Indian D. gibbosa, Blf., but in no other respect 

 generically, or even subgenerically, different from Diplommatina. 



In connection with these various forms of Diplommatina I must 

 mention H. and A. Adams' genus Paxillus, proposed for a species 

 from Singapore, P. adversus. The columellar fold is strong and the 

 constriction distinct in this species, as well as in Martens' P. rubi- 

 cundus. I do not see any characters by which these shells could be 

 separated from Diplommatina. Gould's two Chinese species referred 

 to Paxillus are too insufficiently characterized to admit of a correct 

 opinion being formed regarding them. 



In conclusion I have to allude to the subgenera Arinia, H. and 

 A. Adams and Nicida, Blanford. Of the former Sowerby's Cyclost. 

 minus, from the Philippines, has been considered as the type, and 

 another allied species, A. scalatella, was described by Dohrn from 



