382 MR. C4. C. ROBSON ON LAND AND 



Shell minutely perforated, depressed, thin ; 5j whorls ; suture impressed ; 

 the part of the body-whorl above tlie periphery about the same size as that 

 below ; surface smooth, scarcely marked by the lines oi: growth. The peri- 

 phery rounded. Colour yellowish, becoming lighter underneath ; the body- 

 whorl traversed by two spiral chestnut bands, one on the peripheiy, the other 

 above it; the latter is continued on to the upper whorls. Aperture flattened, 

 lunate, gently curved without any angulation. (.^olumella very slightly 

 reflected over the umbilicus. 



Dimensions: 19 mm. (max. diam.) x ll"25 mm. (max. alt.). 



Holotype in the Zoological Department, British Museum. 



21. *Hemiplecta oleata, AnceT/ (v. Appendix). 



Hemiplecta oleata, Ancey, Nautilus, 16, p. 65. 



Forest of Folohy. 



The examples representing this s[)ecies agree very closely with the type- 

 description, except that the upper surface can scarcely be regarded as entirely 

 " irregulariter grauulata," the granulations being in most parts regular and 

 formed by the decussation of spiral stria? on the lines of growth. 



22. *He]miplecta bathensis, n. sp. (Plate 35. figs. 1-3.) 

 Woods, liassic limestone, Ambongo. 



The author experiences considerable diffidence in })lacing this in the above 

 genus. It resembles javanica, Lamk., ranked by Pilsbry (Man. Conch, 

 ser. II. 2, p. 80) along with certain other Indian and Malaysian forms as 

 "connecting [A^s^a] with. Xestina," and by Gude (Journ. Malacology, x. 1903, 

 p. 54) as a Hemiplecta. Gude's view appears to be the more correct, 

 though, from consideration of examples in the British Museum, it would 

 seem as though javanica is not a true Hemiplecta, but more probably a 

 form intermediate between the latter and Xesta. 



Shell perforate, subconoid, thin ; whorls 6, periphery rounded. The closely- 

 set lines of growth decussated by spiral strise that are sometimes closely 

 gathered and undulating, sometimes scattered and irregular. Aperture 

 without any angulation, rounded, somewhat effuse. Colour white or yellow, 

 the body-whorl traversed by two bright chestnut bands,, one at the periphery, 

 the other above it, the latter continued onto the upper whorls. The columella 

 reflected as a short, rather broad-based callus. 



Dimensions: 36 mm. (max. diam.) x 2'2 mm. (max. alt.). 



Holotype in the Zoological Department, British Museum, from Ambongo. 



23. *Bathia madagascariensis, n. gen., n. sp. (Plate 35. figs. 11-13.) 

 It is only after considerable hesitation that the author has decided to assign 



a generic position to the single representative specimen. 



