84 Mr. W. T. Blanford on Indian Species of Land-Shells 



Subgenus Trochomorpha, Albers (restricted). 



N. attegia, Bens. Irawaddy Valley, near Prome ; Ava. 



N. infula, Bens. Lower Bengal ; Orissa. 



N. cacuminifera, Bens. Nilgiri Hills. 



N. arx, Bens. Therabuin Hill, Tenasserim (Theobald). 



Subgenus Durgella, n. subg. 



N. levicula, Bens. Tenasserim (Theobald) ; Prome, in Pegu. 

 N. mucosa, W. & H. Blanf. Nilgiri Hills. 

 N. seposita, Bens. Darjiling. 



Subgenus Helicarion ?, Fer. 



N. ampulla*, Bens. "Western slope of Nilgiris (Elliott) ; Malabar 

 ( Jerdon) . 



Subgenus SESARAf, Albers. 

 Syn. Tridopsis, Pfr., part. 

 N. pylaica, Bens. Molmain. 

 N. impendens, Gould. Molmain. 

 N, capessens, Bens. Molmain (Theobald). 



Helix Tickelli, Theobald, is a variety of either of the two last- 

 named shells, with two of the teeth in the peristome blended 

 together. 



Section B. Mucous pore above the flattened posterior extremity of 

 the foot, and without a lobe above it. (Ariophanta,2)esmoM/m.) 



Subgenus Hemiplecta|:?, Albers. 



N. Tranquebarica, Fabr. E. coast of Southern India. 



N. Bombayana?, Grat. E. base of Nilgiri Hills. 



N. Belanyeri, Desh. Bombay ? 



N, Maderaspatana, Gray. Nilgiri and other hill-groups of Southern 



India. 

 N. solata, Bens. Nilgiri Hills. 

 N. bistrialis, Beck. Madras and Trichinopoly. 



N. semirugata, Beck, I have little doubt, is only a variety of 

 Tranquebarica. N. vitellina, Pfr., is almost equally question- 

 able. 



* I am indebted to Mr. Walter Elliott for a drawing of the animal of 

 Nanina ampulla, Bens., which I have not myself met with. It would 

 seem to be distinguished from Helicarion by the absence of the long 

 mantle-lobes reversed over the shell ; but I hesitate to separate it without 

 further information. Vitrina irradians, Pfr., observed by my brother, I 

 believe to be a true Helicarion, as are probably several of the other Indian 

 Vitrinas, e. g. V. gigas, Bens. 



t Classed by Albers as a subgenus of Helix. 



X The type of Albers's subgenus Hemiplecta is H. Humphrey siana. Lea, 

 which is a very different shell from any of those here attributed to the 

 section. Perhaps also IV. Tranquebarica and its allies should be separated 

 from the remainder. 



