588 Records of the Indian Musenm. [Vol. VIII, 



ing, last well rounded; aperture narrowly lunate, vertical ; peris- 

 tome thin ; columellar margin oblique. 



Size: major diameter no, minor 95, alt. axis 5*0 mm. 



Unfortunately there is only one example of this species and 

 that is not fully grown, the shell is new to me and of peculiar 

 form, and would readily be recognized when found again. 



Tadunia^ gen. nov. 



Shell globosely conoid, whorls numerous, narrow, closely 

 wound and regularly increasing. 



Animal : foot with broad peripodial margin, a small lobe 

 above the mucous gland. In the generative organs, no amatorial 

 organ, no caecum to the penis, spermatheca very long. 



Tadunia oakesi, n. sp. 

 (Plate li, figs. 10, 10a.) 



Locality. — Abor Hills, Assam {G. F. T. Oakes, R.E.). 



Shell globosely conoid, scarcely perforate, rather flat on base; 

 sculpture very fine longitudinal striation only to be seen with a 

 high power, this is divided up at very regular intervals by stronger 

 striae, this is also seen on the base; colour pale umber brown; 

 spire high, rather flatly conoid, apex rounded; suture very im- 

 pressed; whorls 7, narrow, closely wound and regularly increasing; 

 aperture semilunate, nearly vertical; peristome thin; columellar 

 margin suboblique. 



Size: major diameter g-o, minor 85, alt. axis 5'0 mm. 



Three specimens were found by Capt. Oakes and put up alive, 

 but they died en route. One was put to soak and the radula was 

 secured and mounted but much broken The centre tooth and 

 admedians are rather small on nearly square plates, the laterals 

 are curved with a minute cusp some way below the point. The 

 formula is +20. 7.1.7. 20-t-- 



The foot showed a very broad peripodial fringe, and an over- 

 hanging lobe above the mucous pore. The genitalia are preserved, 

 but not in a very good state. The penis is simple, no caecum, 

 the spermatheca very long and containing a single spermatophore, 

 which is very elongate with many bifid spines on the flume. 



Although belonging in all probability to the Macrochlamyinae, 

 the shell of this species differs so very much in every way from 

 typical Macrochlamys, on conchological grounds it cannot be placed 

 in that genus, and I am obliged to create yet another one for its 

 reception, naming it Tadunia after one of the Abor Tribes of the 

 outer hills. What has been seen of the animal bears this out also. 



Tadunia? muspratti, n, sp. 



Locality. — Eastern Naga Hills, a single specimen, Beddome 

 collection, B.M. {Muspratt). 



