88 Messrs. J. C. Melvill and J. H. Ponsonby on 
habitat of this little species, of which there are three speci- 
mens, two being hardly full-grown, and consequently smaller 
than that selected for the type. It falls under the “‘ dbésculpta”’ 
section of Pella, considered typical in Tryon’s Manual, while 
it is there mentioned that the name “Sheldonia” has been 
employed by Ancey (1887) for such species as natalensis, 
Trotteriana, and cotyledonis. 
HH. rhysodes is thin, horny, fuscous, five-whorled, with white 
oblique lire longitudinally crossing, somewhat irregularly, 
there being here and there small spaces left quite clear and 
free ; and the shell presents a wrinkled appearance in conse- 
quence. ‘The umbilicus is deep, but narrow ; mouth lunar- 
ovate, lip a little reflexed at the columellar margin. 
3. Helix (Pella) tuguriolum, sp.n. (Pl. V. fig. 5.) 
HH. testa obtecte umbilicata, tenui, albo-cornea, subplanata, infra 
ventricosa ; anfractibus quinque, longitudinaliter indistinctissime 
striatis, transversim tenuiter et minute concentrico-decussatis ; 
apertura lunari-ovata ; peristomate simplici, ad marginem colu- 
mellarem paullo reflexo. 
Long. 6 (sp. majoris), lat. 8-50 mill. 
Hab. “S. Africa”? (#4. LZ. Layard). 
Three specimens, of which two are perfect. A plain, 
smoothish, horny shell, bearing indistinct lines of longitudinal 
ribbing (when closely examined with a lens), very minutely 
decussated by spiral striw. Allied to H. Lovéni (Krauss), 
represented by only a poor specimen in the National Collec- 
tion, South Kensington, from which this species seems to 
differ chiefly in the absence of any keel at the periphery, and 
likewise in there being no sign of epidermis, which in A. 
Lovéni adheres to the ribs and renders them more conspicuous. 
4, Helix (Pella) erateina, sp.n. (Pl. V. fig. 3.) 
H. testa profunde sed anguste umbilicata, lenticulari, depresso- 
conica; anfractibus quinque, cinereis, undique confertim costulis 
lamellosis regularibus oblique cinctis, flammisque rufis longitu- 
dinaliter decoratis, ad suturas quasi-crenulatis, anfractu ultimo 
apud peripheriam serri-carinato ; apertura subquadrata ; peristo- 
mate simplici, ad marginem columellarem paullum reflexo. 
Long. 2°25, lat. 3 mili. 
Hab. Bredasdorp, in sand under stones; and Cape Point 
(EZ. L. Layard). 
A most elegant and beautiful little shell, found, as noticed 
above, by Mr. Layard in two localities ; we have taken the 
