140 GUDE: GENUS SESARA, ALB., WITH TWO NEW FORMS. 



has the apex curved toicanis the periplienj, and the posterior one 

 towards the umhilicus ; the basal margin instead of being horizontal ns 

 in S. harmeri, descends obliquely and forms an obtuse angle with the 

 columellar margin. S. liarmeri is further separated from S. diplodon 

 in having the keel more acute and compressed ; and finally the last 

 whorl of the latter shell is not deflected in front. 



S. diplodon (figs 3, 4) was described by Benson in 1859^. As the 

 double nature of the tooth on the basal margin is not mentioned in 

 the original description, I was at first uncertain which of the two 

 forms to refer to Benson's species. Mr. Harmer, however, obligingly 

 forwarded to me for inspection the three type specimens from the 

 Cambridge ^Museum of Zoology, and although these are not mature — 

 a trace of a tooth, being shown only by one specimen — the distinctive 

 character of the base of the shell leaves no doubt that the form with 

 the double basal tooth is Benson's species. That the difference in 

 the character of the teeth of the two species, and the scrobiculation of 

 S. dijilodon, are not dependent on age is amply demonstrated by my 

 examination of immature specimens of both in my collection. 



Twelve specimens of S. dij)lodon, together with the new species, 

 were received from a native collector, these former measure : 



Diam. 8'5, alt. 6 mm. Diam. 7, alt. 5 mm. Diam. 6, alt. 45 mm. 



/S. dipjlodon is known to be of fairly wide distribution. Mr. 

 Nevill - having recorded the following habitats : Preparis Island, 

 Little Cocos Island, Thyet Myo, Ponsee and Bhamo, Arakan Hills, 

 Naga Hills, Sylhet, Chittagong, Khasi Hills, Dafla Hills. 



Sesara harmeri v. anodonta, n. var. Figs. 5, 6. 



In this variety, which to some extent connects the two fore- 

 mentioned species, the spiral lines are more distinct, and the base 

 broader than in the type. There are no teeth in the aperture. 



Diam. maj. 8"5, minor 775, alt. 6 mm. One specimen. 



Hah. — That of the type. 



5. 6. 



Figs. 5 and 6. — Sesara harmeri v. anodonta, n. var. 



As the species and varieties of Sesara have not hitherto been 



1 Ann. and Mag. N. H., 1S59 (ser. 3), vol. iii, p. 187. 



2 Hand-List Moll. Ind. Mus. Calcutta, 1878, i, p. 53. 



I 



