new Mollusks from Sout/i or Central Africa. 87 



A very similar slicll to K. ihelodonta^ differing in being 

 composed of more whorls, namely seven, as against six, 

 greater attcnnation of build, and feebler development of lip, 

 though the various plica) are arranged as those of the above- 

 mentioned species. It is never ditficult, however, to distin- 

 guish them. 



XIV. — Descriptions of Seventeen new Terrestrial Mollusks 

 from South or Central Africa, in the Collection of Edgar L. 

 Layard, Esq. ^y James Cosmo Melvill, M.A., F.L.S., 

 and John Henky Ponsonby, F.Z.S. 



[Plates IV.-YL] 



The seventeen species which form the subject of the present 

 paper are from the collection of Mr. Edgar L. Layard, who 

 has most kindly placed them at our disposal for description. 



1. Nanina hypochlora^ sp. n. (PI. IV. fig. 8.) 



N. testa imperforata, effusa, pallida stramineo-cornea, vitrea, laevi, 

 nitida; anfractibus quinque, planato-depressis, ultimo rapide 

 accrescente ; apertura ovata ; peristomate simplici, tenui. 



Loug. 4-50, lat. 12 mill. 



Hah. Cape of Good Hope [Edgar L. Layard). 



A plain, smooth, shining, and delicate little species, some- 

 what flattened, the last whorl much the largest, lip thin, 

 aperture ovate. 



Though of simple character it does not appear to have been 

 previously noticed or described. Two specimens, precisely 

 similar. 



2. Helix {Pella) rhysodes, sp. n. (PI. IV. fig. 2.) 



H. testa profunde sed anguste umbilicata, teuui, depresso-convexa, 

 corneo-fuscescente, ad apicem planato-depressa ; anfractibus 

 quinque, apud suturas compressis, undique longitudiualiter liris 

 albulis irregularibus oblique cinctis, ultimo anfractu ad medium 

 vix angulato ; apertura luuari-ovata; peristomate simplici, tenui, 

 ad marginem columellarem reflexo. 



Long. 4, lat. 6 mill. 



Hah. " S. Africa " (E. L. Layard), 



Unfortunately Mr. Layard has no record of the precise 



