98 Contributions to Indian Malacology. [No. 2, 
opercula, which is flat like that of Pt. pullatus, 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, Pir., 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 Cyclotus is known from Burma. 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 Cyclot?, and represents them; while the Cyclotc 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. 
Alyceus. 
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. Ave, 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. sculptilis, Bens., is abundant, especially on 
the hills a few miles south of the town, where also A. armuillatus, 
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. wmbonalis, 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, pavvus. 
Tt may be distinguished as Pt. Arakamensis, n. sp. I have not specimens at 
hand, so cannot add a complete description. 
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