Mr. W. H. Benson on new forms of Cyclostomacea. 231 



exhibente, subtus cum basali exteriore canalem incisum, margiui- 

 bus extus callosis, ascendentem, construente. Operculo ? 



Long. 10, diam. anfract. penult. 5 mill. 



Hab. in provincia Bengalensi orientali Sylhet. 



This handsome species is singular on account of the great 

 development of the callus, which runs up the penultimate whorl 

 two-thirds of its height, forming, with the prolongation of the 

 outer lip, a channel leading to the incision at the top of the 

 aperture. 



No species of Pupina has hitherto been described as inha- 

 biting the mainland of either Cis- or Ultra-Gangetic India, 

 although Sowerby has assigned a species to the island of Singa- 

 pore, situated at the extremity of the Malayan Peninsula ; these 

 three species are therefore an interesting addition to the genus 

 in a geographical point of view, the last one especially, on 

 account of its occurrence so far to the northward. 



15. Otopoma Blennus, n. s. 



Testa anguste et profunde umbilicata, eonoideo-globosa, crassiuscula, 

 leviter striatula, sordide albida; spira conoidea, sutura submar- 

 ginata, apice acutiusculo ; anfractibus 5 convexiusculis, ultimo 

 ventricosiore ; apertura obliqua, ovali, superne angulata ; peristo- 

 mate recto obtuso, marginibus callo brevi, tenui, junctis, colu- 

 mellari leviter revoluto, expanse . Operculo ? 



Diam. major 18, minor 15, alt. 18^, axis 13|^ mill. Apert. 10^ mill, 

 longa. 



Hab. raro ad Moulmein. 



This species is in a worn condition, and in a fresh state may 

 exhibit more colour. In form it is less depressed in proportion 

 to the diameter than O. clathratulum, from which it differs other- 

 wise in sculpture. 



16. Hydrocena IlleXy n. s. 



Testa vix perforata, ovato-acuta, minutissime striata, spiraliter con- 

 fertim tenuisulcata, succinea, translucente, versus spiram rubelio- 

 fusca ; spira nitida, elongato-conica, sutura profunda, apice obtu- 

 siusculo ; anfractibus 4 valde convexis, ultimo ^ totius testae supe- 

 rante ; apertura obliqua, ovata, superne angulata, peristomate 

 tenui, non continuo, marginibus conniventibus, dextro recto, acuto, 

 columellari reflexiusculo. Operculo tenui, corneo, pellucido, pauci- 

 spirato, nucleo basali. 



Long. 2f, diam. If mill. 



Hab. ad Phie Than, vallis Tenasserim, satis frequens, saxis calcareis 

 adhserens. 



Nearly allied to Hydrocena {Cyclostoma) sarrita, nobis. An- 

 nals, vol. viii. N.S. p. 188, but more slender in form. The 



