1921.] N. Annandale & B. Prashad : Imiiau Molluscs. 135 



The unique type of this variet}- differs from the shells of the 

 forma Ivpica in (i) all the whorls of the spire and jiarticularlj^ the 

 penultimate whorl being proportionateh' larger and more tumid, 

 (ii) body-whorl a little smaller, but distinctly keeled, (iii) suture 

 more deeply impressed and (iv) the peristome thicker owing to its 

 margins being greatly retroverted. 



Typc-spccinicn : — No. M 1 1866/2 in the collections of the Zoo- 

 logical vSurvey of India (Indian Museum). 



Lccality. — A single shell was collected at Port Canning in the 

 Gangetic Delta by the late Dr. F. Stoliczka. 



Remarks — This may possibly represent a distinct species, but 

 we prefer to leave it as a variety of A. miliacca owing to there 

 being a single specimen in which also the apex of the spire is 

 eroded. 



Var. subangulata, Nevill, MS. (Prashad). 



Plate XVI, figs. 9, 10. 



1S85. Hydyobia [Bythinella) miliacea subvar. subaiigulata, Nevill, op. 

 cit.. p. 52. 



1915. Paliidestrina {Belgyandnt) miliacea sub\ar. sabaiigitlata. Pres- 

 ton, op. cit., p. 68. 



iyi6. Stenotltyra perpnmila (in part), Preston, op. cit., p. 31. 



This variety, which is fairly common at Port Canning and in 

 the Chilka Lake, occurs at the former place with the forma typica. 

 Specimens of it were found in the Cochin backwaters on the Mala- 

 bar Coast by Dr. F. H. Gravely ; they were identified as 5. perpn- 

 mila by Preston. 



The variety differs from the typical form in having a propor- 

 tionateb' smaller body-whorl and in the aperture being subangu- 

 late instead of the evenly rounded one of the typical form. 



Type-series. — No. M 11867/2 in the collections of the Zoologi- 

 cal Survey of India (Indian Museum). 



Astenothyra burmanica, sp. nov. (Prashad). 



Plate XVI, figs. II, 12. 



The shell of this species is minute and of a dirty creamy col- 

 our. It is ovate, and has a bluntly pointed apex. There are six 

 whorls, and the suture is deeply impressed, somewhat canaliculate 

 and only slightly oblique. The whorls increase gradually though 

 a little irregularly ; the first two are very minute, the third is a 

 little more than half the breadth of the fourth, while the penulti- 

 mate whorl is more than twice as broad as the fourth. The body- 

 whorl is large, moderately inflated and, in dorsal view, somewhat 

 trumpet-shaped. The mouth is oblique, ovate but acutely point- 

 ed posteriorly ; the peristome is continuous and only slightly 

 thickened with a rather broad callus. The entire surface of the 

 shell is covered by spiral pitted lines ; these are specially well 

 marked on the body- whorl. 



