1877.] Tipper Bttnna and Timnan. 19 



Helix (PLECTOTBons) trichoteopis, P£r. 



miix frichofropis, Pfr., Zcits. Mai. 1850 (China) ; Conch.-Cab., pi. 134, fig. 9-10. 



This species differs from I£. tapeina by the shape being a trifle more 

 trochoid, the apex more central, and the whorls more concave ; the keel at 

 the periphery is even more developed, and the aperture a trifle more pro- 

 duced laterally ; a marked characteristic is the minute and close spiral 

 sculptm'e of the base, which in H. tapeina and all its A^arieties is on the 

 other han^ distinctly though minutely granulose ; it is principally on 

 account of this last character that I prefer to class S. tricliotropis as a 

 distinct species, and not as a variety of H. tapeina (near rotatoria and 

 akoutongensis.^ 



Major Godwin- Austen found an extremely interesting form in the 

 Khasi Hills, with more depressed spire and thinner texture (axis 6, diam. 

 18 mil.) ; it is, I believe, one of these specimens that is represented in the 

 Con. Indica (j^l, 15, fig. 4) as H. ahoutongensis, from Pegu. A few speci- 

 mens were found by Dr. Anderson at the Second Defile, Irawady ; they agree 

 exactly with specimens in the Museum from Shanghai. 



Specimen from 2nd Defile, Irawady, axis 6, diam. 15|^ mil. 



Helix (Plectotropis) peeplatvTata, n. sp. 



(H. trichotrojnsy var. ?) 



Four specimens only of this very remarkable form were found at Mim- 

 boo. Upper Burma ; a larger series is required to prove with certainty whe- 

 ther it be a distinct form, or only a variety of S. tricliotropis^ or of JBl. 

 tapeina (near var. rotatoria). 



After a most careful examination with a lens, I am unable to trace 

 airf sculpture whatever on the base ; the seven whorls above are perfectly 

 flat, as in the European H. explanata ; the keel on the periphery and the 

 shape of the aperture are about the same as in H. tricliotropis (especially 

 the Khasi form) ; the umbilicus, however, is considerably more open, quite 

 twice as open as in the Chinese and the above recorded specimens, and 

 about half as open again as in those from the Khasi Hills ; the epidermis 

 seems peculiar, having the appearance of being less close in texture and of a 

 decidedly more developed character. 



Axis 4|, diam. 17^ mil. 



Helix (Plectoteopis) Oldhami, Bens. 

 Helix Oldhami, Bens.— A. & M. 1859, ser. 3, vol. Ill, p. 184 ; Con. Indica, pi. 15, fig. 7. 

 This species, well represented in the Con. Indica, is next allied to H!. 

 catostoma and to S, tapeina ; the characters of the aperture distinguisli it 



