Mr. W. H. Benson on new species of Helix. 185 



subtus Iseviori, traiislucente, olivaceo-cornea ; spira gracili, conica, 

 lateribus concavis, sutura marginata, apice acutiusculo, hyalino ; 

 anfractibus 7^, superioribus convexiusculis, turn planiusculis, ulti- 

 mo acute carinato, subtus convexiusculo ; apertura obliqua, tra- 

 peziformi, peristomate recto, acuto, margine columellari breviter 

 reflexo, superne perforationem subtegente. 



Diam. major 10, minor 9, axis 7i mill. 



Habitat ad collem Therabuin, vallis Tenasserim, nee raro ; detexit 

 W. Theobald. 



Distinguished by its sculpture and slender concave spire, 

 which recalls that of my Nilgherry species, H. cacuminifera. 



4. Helix Catinus, 



Testa sinistrorsa, late umbilicata, lenticulari-depressa, laevigata, su- 

 perne demum oblique rugata, fuscescente ; spira depresse conoidea, 

 apice obtuso, sutura marginata ; anfractibus 7i lente crescentibus, 

 superne planulatis, ultimo non descendente, acute carinato, carina 

 compressiuscula, basi convexa, circa umbilicum profundum per- 

 spectivum subangulata; apertura perobliqua, rotundato-lunari, 

 peristomate expanse, reflexo, superne prope carinam prominente, 

 angulato, marginibus lamina valde elevata lamellam breviter in- 

 trantem emittente junctis. 



Diam. major 18, minor 16, axis 6^ mill. 



Habitat prope Moulmein, provincise Tenasserim, rarissime. 



Intermediate between H. plectostoma, B., and its own provin- 

 cial neighbours, H, Achatina, Gray, and refuga, Gould. It is 

 distinguished from the former by its inconspicuous sculpture 

 and more depressed form, by the entering parietal plait, greater 

 size, and solidity ; and, representing the two latter by the feature 

 of a parietal plate, it presents a strong contrast to them in its 

 subconoidal spire, carination, and deeper umbilicus. 



The single specimen transmitted for examination is in such a 

 corroded state, that the true nature of the sculpture can merely 

 be guessed at. The aperture is whitish. 



5. Helix Oldhami, n. s. 



Testa late umbilicata, orbiculato-depressa, tenui, oblique irregulariter 

 flexuoso-striata, cornea ? ; spira vix elevata, vel depressissime co- 

 noidea, apice exsertiusculo, obtuso, sutura impressa; anfractibus 

 6^ lente crescentibus, planulatis, ultimo antice breviter rapide 

 descendente, superne obtuse carinato, subtus convexo, circa umbi- 

 licum profundum perspectivum angulato ; apertura obliqua, sub- 

 circulari, peristomate expansiusculo, reflexiusculo, marginibus 

 conniventibus, approximatis. 



Diam. major 13, minor 11, axis 6 mill. 



Habitat in regno Burmano. 



Collected by Professor Oldham, Chief of the Indian Geological 



