Mr. W. H. Benson on new species of Burmese Helices. 253 



The spire is more depressed and the apex less prominent than 

 in H, Tiieodori, Phil. ; the shell also is more solid, the aperture 

 wider, and the columellar lip descends more horizontally. 



10. Helix Laidlayana, n. s., nobis. 



Testa con striate perforata, sinistrorsa, turbinato-depressa, tenui, ob- 

 lique striata, striis confertissimis spiralibus decussata, nitidiuscula, 

 traaslucente, albida, fascia 1 supera angusta, rufo-castanea, peri- 

 phseriam tangente, interdum 1 supera lata, et altera infera remo- 

 tiuscula ornata ; periomphalo et pariete aperturali castaneis ; spira 

 depresse conoidea, apice obtusiusculo, sutura leviter impressa ; 

 anfractibus 5 sensim accrescentibus, ultimo ad periphseriam angu- 

 lato, aiitice breviter descendente, subtus convexo ; apertura valde 

 obliqua, subquadrato-lunata ; peristomate recto, acuto, margine co- 

 lumellari subrecte descendeute, anguste reflexo, perforationem con- 

 strictam subtegente. 



Diam. major 27, minor 23, axis 15 mill. Apart. 15 mill, lata, 13^ 

 alta. 



Hab. in Provincia Bengalensi Bheerbhoom, ubi exemplum unicum 

 Junius detexit J. W. Laidlay ; nuperrime in Provincia Orissse, 

 non procul ab urbe Cuttack, exempla majora non raro invenit 

 W. Theobald. 



Named after a former Secretary of the Asiatic Society of 

 Calcutta, to whom I am indebted for a specimen found by him 

 many years ago in the region of the late Santhal insurrection. 

 The rediscovery of the shell in about 20° N. lat., as well as the 

 detection of H, Capitium in the same quarter, shows that these 

 species range through nearly 5 degrees of latitude. The colour- 

 ing of H. Laidlayana has much resemblance to that of H. qiussitaj 

 Fer., but the shell has nearer relations to H. interrupta, nobis, 

 and H. trifasciata, Miill. It differs from H. interrupta in colour, 

 depressed form, greater number of whorls, contracted perfo- 

 ration, descent of the last whorl above the aperture, and in the 

 disposition of the bands. When a single broad dark band is 

 present in interrupta, it touches the angulate periphery. From 

 H. 3-fasciata it differs in lustre, less depressed form, want of 

 solidity, contracted perforation, more vertical columellar lip, and 

 in the disposition of the bands, that which is above the periphery 

 in 3-fasciata never touching the angle. The colour of the peri- 

 omphalus and parietes of the aperture is also peculiar. 



Among the known Burmese Helices, H. Achatina, Gray [an- 

 guina, Gould), var. yS, Pfr., was taken by Mr. Theobald at Maul- 

 main, and at the Rangoon Caves on the Salween River. A 

 small variety of H, refuga, Gould, occurred at Kwadouk, near 

 Thyet Myo, on the Northern Frontier, and an interesting dex- 



