Jaw and Lingual Dentition of Pulmonata. 191 



show the two cutting points which characterize the section b (see my 

 paper referred to above, p. 334). On the same membrane, however, are 

 some marginals having three cutting points and some which are quite 

 pectinate, being, therefore, like my section c to which I formerly referred 

 the subgenus. This variation shows that my distinction between b and c 

 was not well founded. 



Of Laminella there was one species : A. obesa, Newc. The jaw is like 

 my fig. 7 (1. c). Teeth 27-1-27, of same type as other species of the 

 subgenus (see my paper, 1. c). I have, however, figured the 19th tooth 

 (pi. xiv, fig. H), to show that here, again, I do not find the character of 

 only two cutting points to be constant in the marginals, the outer cutting 

 point being trifid in the tooth figured. 



Of Newcombia there was A. venusta, Mighels. There are 24-1-24 

 teeth, with about 8 laterals (pi. xiv, fig. D). Here, again, the marginals 

 figured are pectinate, though others are simply with two cutting points 

 as I formerly (1. c.) supposed the case in all species of this subgenus. 

 Jaw slightly arcuate, with blunt ends; a few vertical wrinkles. 



From my finding the variation I have noted above in the marginal 

 teeth of Leptachatina and Newcombia, I am forced to doubt the accuracy 

 of the distinction in my sections b and c (see 1. c). 



There were also specimens of Achatinella auricula, Fer., which is in- 

 cluded in Achatinella by Pfeiffer (Mon. VI), but referred by von Martens 

 to Partula. The dentition proves it to be an Achatinella, beiug of the 

 same type as Achatinella s. s., and Parlulina. 



Note on the Classification of the Achatellince. 



BY THOMAS BLAND. 



In the paper by my friend Mr. W. G. Binney and myself, 

 " On the Lingual Dentition and Anatomy of Achatinella and 

 other Pulmonata" (Annals X, 1873), we adopted and gave 

 particulars of the classification of v. Martens (Die Heliceen, 

 ed. 2) and came to the following conclusion, viz., that three 

 groups are indicated by the forms of lingual dentition in the 

 genus Achatinella. 



a. Partulina, Achatinella s. str. 



b. Newcombia, Laminella. 



c. Leptachatina. 



As regards the subgenera (of v. Martens) not represented 

 among shells received from Mr. Gulick, we concluded, judg- 

 ing from the shell alone, that Bulimella and Apex belong to 

 the group a, and Labiella rather to b or c than to a. 



