98 Contributions to Indian Malacology. [No. 2, 



opercula, wliich is flat like that of Pt. pullcubus, and not convex as in 

 Pt. rupestris, &c. These shells also closely resemble a species collected 

 by Mr. Theobald at Cherra Poonjee, and referred by Mr. Benson to 

 Pt. Albersi, Pfr., which has a convex operculum, and a peculiarly 

 shaped wing. The specimens from Tongoop and its neighbourhood 

 had a much thicker epidermis than those from Akyab, and were 

 larger, but otherwise similar.* 



No form of Gyclotus is known from Bunna. I have shewn, in a 

 paper published in the Annals and Magazine of Natural History for 

 June, 1864, that the Cyclophorus calyx group approaches very closely 

 to the true Cycloti, and represents them ; while the Cycloti of India 

 (e. g. C. subdiscoideus, Sow.) are allied to Cyclostoma, having the 

 peculiar cleft foot and mode of reptation of that genus. I have pro- 

 posed to place them in a new genus, Cyclotopsis. 



AlyccBus. 



Much concerning the distribution of the numerous species of this 

 genus has been communicated in previous papers. A brief recapitula- 

 tion may be useful. 



A. Avce, W. Blanf., is the only form as yet found on the Shan hills, 

 east of Ava. A. Vulcani, W. Blanf., occurs at Puppa hill, Pagan. 

 About Thayet Myo, A. scidptilis, Bens., is abundant, especially on 

 the hills a few miles south of the town, where also A. armillatus, 

 Bens., was found in very small numbers, its minute size doubtless 

 rendering the search for it difficult. A few specimens of a small 

 variety of A. umbonalis, Bens., first appeared here. They have a 

 " retro-relict" outer peristome, and coarse sculpture on the upper 

 whorls. The typical variety is rather common at Akoutoung, the 

 original locality. I found this species again at one spot, a little north 

 of Bassein, near the village of Kani. The older specimens obtained 

 there, and others from the base of the Arakan hills, west of Prome, 

 had the outer peristome retro-relict as in the Thayet Myo variety, a 

 peculiarity I never observed in the typical Akoutoung form. 



* Since the above was written, I have heard from Mr. Benson, who has kind- 

 ly compared the species with Pt. parvus. In the latter, the wing runs up the 

 penultimate whorl, while the wing and sinus of the Akyab and Tongoop species 

 resemble those of Pt. pullatus. In other respects the form resembles Pt. parvus. 

 It may be distinguished as Pt. Arakomensis, n. sp. I have not specimens at 

 hand, bo cannot add a complete description. 



