1862.] Contributions to Indian Malacology. 139 



Hat>. cum A. grapMco ad Moditoung. 



But a single specimen of each variety was found. The first was 

 obtained on the banks of the Pado Khyoung, a stream running 

 from the Arakan range on the Pegu side in the district of Henzada. 

 A single specimen either of another variety, or of a distinct but 

 closely allied species occurred to me on the banks of another stream, 

 the Alon Khyoung, lying between the two previously mentioned 

 localities. This form differs in having a simple lip, and, apparently, 

 a longer sutural tube. None of the specimens are quite fresh, 

 although all are in fair condition and unbleached. Of the epidermis 

 only traces remain on both shells. 



This species is not affined to any known form. It is perhaps 

 nearer to the little group to which A. graphicus belongs than to any 

 other, but it has not the short sutural tube nor the ovately conoid 

 form which characterizes that section of the genus. The shortness 

 of the constriction, and the very slight degree in which it expands 

 towards the aperture, connect this form somewhat with the section 

 Dioryx of Mr. Benson. 



5. Altc^etjs succineus, n. s. 

 Testa aperte umbilieata, depresso-turbinata, acute sinuato-costu- 

 lata, succinea, translucens. Spira conoidea, apice obtusula, sutura 

 impressa. Anfr. 4, ultimus ad latus inflatus, ibidem confertissime 

 costulatus. Strictura longa, medio tumida, et duobus vel tribus 

 costulis obliquis, sulculis internis correspondentibus, signata. Tubu- 

 lum suturale mediocre, £ peripheric subsequans. Apertura obliqua, 

 irregulariter circularis, superne subangulata : peristoma duplex ; in- 

 terno continuo, incrassato, expansulo, margine dextro bis obtuse angu- 

 lato, ad basin canaliculo haud intrante perforato ; externo breviter 

 expanso, retro relicto. 



mm. inch 



Diam. maj. 5 or 0.2 



„ min. 4 0.16 



Alt. 3i 0.13 



Ap. diam. \\ 0.06 



Habitat in montibus Arakanensibus. 



Some of the peculiarities of this species, such as the canaliculate 

 base of the peristome, and the two or three small plaits on the con- 

 strictions are repeated in that next described. The plaits or ridges 



