1859.] Descriptions of Burmese and Indian Helicidce. 307 



Diam. 0.58. Alt. 0.25. Habitat ad Akowtoug Proviucia Pegu, 

 prope ripas Irawadi. 



A single dead shell, occurred with numbers of H. rotatoria, which 

 it generally resembles, but from which it is distinguished by its 

 sharper keel, more depressed spire, and simpler sculpture. 



H. Poongee, n. s. 



Testa turbinate conoidea, tenui, apice depressiusculo, anguste 

 umbilicata, tumida, fusco-cornea, Aufract. 6^ convexis. Apertura 

 rotunde lunari. Perist. recto, acuto. 



Diam. 0.26. Alt. 0.20. Habitat prope Maulmein. 



A thin brown helix, somewhat resembling the small H. molecula 

 but with a more elevated spire, which, however, varies a little in 

 different specimens. 



In addition to these, two new helices of a peculiar type and a new 

 Sheptaxis (S. Sankeyi. B.) have been received by Mr. Benson from 

 near Maulmein, descriptions of which may soon be looked for. The 

 shells forwarded to me by Capt. Haughtou have enabled me to rectify 

 an error in Mr. Benson's description of a somewhat singular origin, 

 viz. that Megalomastoma gravidum is merely the adult shell of 

 Otopoma Blennus, which should now stand as Otopoma Gravidum. 

 The only live specimen of 0. gravidum procured by me at Maulmein^ 

 was furnished with a thin operculum, without doubt being abnor- 

 mally formed after the loss of the origiual shelly one. This oper- 

 culum was, I believe, sent to Mr. Benson and hence the mistake in 

 question. The true operculum of 0. Gravidum is the same as that 

 described by Mr. Benson as appertaining to O. Blennus. 



There appear to be two species of Streptaxis at Maulmein besides 

 the new one just received by Mr. Benson. The shell which I take 

 for S. Petiti is very variable in size and other particulars, which may 

 account for some discrepancy in the description and my specimens. 

 In the largest shells the description holds — " anfract. penultimus 

 subangulatus," but in the smaller shells the keel is well pronounced. 

 The extremes of this species (?) are Diam. max. 0.54 in the largest 

 specimen and 0.39 in the smallest. The aperture too is more round- 

 ed thau in the next species, in which it is very square. 



The other species which I cannot identify is tolerably uniform in 

 size being about 0.47 in extreme length. The penultimate whorl 



2 it 2 



