490 ^Ir. II. B. Preston on new SheUs 



A single female specimen from between Wau and Chak 

 (yhak, in the Bahv-el-Gliazal Province, presented to the 

 British Museum by Mr. A. L. Butler. 



This snake appears to be most nearly related to S. Chanlert, 

 described by Dr. Stejneger from a specimen in bad condition 

 ol)tained at the mouth of the Tana River, British East Africa. 

 But the proportions of tlie liead-shields and the coloration 

 are too different to justify mo in referring the Bahv-el-Ghazal 

 specimen to that species. 



LXIX. — Descriptions of new Species of Land and Fresh' 

 voter Shells from Central and South America. By II. B. 

 Preston, F.Z.S. 



Folita peruviana, sp. n. (Fig. 1.) 



Shell somewhat depressed, thin, pale brownish horn- 

 colour ; whorls 4^, sculptured with transverse, arcuate strise ; 

 sutures deeply impressed ; umbilicus wide and deep ; peri- 

 stome simple ; aperture lunate. 



Alt. 3'25, diam. maj. 7*25 mm. 



Apertuie: alt. 2, diam. 1"5 mm. 



Ilah. Chanchamayo, Peru. 



Closely allied to P. insignis, D'Orb. *, which occurred with 

 it ; F. jxruviana is, however, not so depressed and of a darker 

 colour, the umbilicus is also rather narrower and the sutures 

 though well defined do not present the almost channelled 

 appearance which is the case with P. insignis. 



Stephanoda hogotensis, sp. n. (Fig. 2.) 



Shell orbicular, somewhat depressed, dark brown, sliowing 

 traces of having been covered with a hairy periostracum ; 

 whorls 5-^, sculptured with fine, arcuate, transverse, and very 

 minute spiral striae; umbilicus very wide and deep ; aperture 

 lunate. 



Alt. 4, diam. maj. 8 mm. 



Aperture: alt. 2'5, diam. 1 mm. 



Hah. Bogota, United States of Colombia. 



Fleurodonte {Lahyrinthus) Da Costiana, sp. n. (Fig. 3.) 



Shell thin, subdepressed, carinate, pale brownish horn- 

 colour; whorls 4^, obliquely striate with lines of grovv^th and 



* Voy. Am^r. M.5rid. t. 2(5. ff. 14-17. 



