ON NEW GENERA AND SPECIES OF ZONIVIDA FROM AFRICA. 787 
43. Diagnoses of new Genera and Species of Zonitidee from 
Equatorial Africa. By H. B. Preston, F.Z.8. 
[Received April 3, 1914: Read May 5, 1914. ] 
(Plates I-III.*) 
INDEX. Page 
Geoomap incall apeeses ithe penetra cone oa eictade cota ON 
Systematic : 
IOV GO DANG D1 il Scqubdodsoce dco teen sas ebIaagEae Om a) 
IE aPURT AMG FOE NG goo bscee dsocns ecocaacen or crgeee, UL 
TIGRE ANG, (RDBlo We do 30 dclachashonwedbeone can ehearen WEL) 
J GERDA Gi, (RDN Whe, csp baboceacesabaanaqaucoceepecesecen | tll) 
INCU T RA iy ERO Wo shnecsecacnsecannboeeseeeoneenss  telUY4 
DGIRETC AH Kei E295 We esnos nbudeoedaHeascodespaaace sencdd mae. 
WRGLERSANG, BOUS Silo enacbsaqnon copaosossoncensancee | AUB) 
IRON AL NING sodees beg seasacmes ooo cd=soc dapeepere yO 
Faltloonella, gen. MN. ....-..-.. eee eceeeeces. 1009, 
And 74sp.n., 1 sub-sp. n., and 2 var. n. 
In working at the present family the author has found it 
necessary to refer a number of the species to new genera, having 
found that the Zonitide of the Central African region have been, 
hitherto, in common with those of many other geographical areas, 
massed together in a few genera, so that these now contain many 
widely divergent forms; in very few instances has he found, as 
might have been reasonably expected, that the South African 
generic and subgeneric terms are applicable to the Central African 
types, hence the nine new genera described in the present paper. 
Generally speaking, the family, as represented in Central 
Africa, has not, so far, shown in any marked degree, the peculiar 
local phases common to both genera and species such as the 
author found when dealing with the agnathous forms from the 
same localities, and which were described last year in these 
‘ Proceedings.’ 
AFRICARION CONCAVOSPIRA, sp. n. (Pl. IL. fig. 20.) 
Shell subovate, very thin, almost membranaceous, transparent, 
polished, straw-colour; whorls 3, the first two small, sunken, 
sculptured with punctate spiral striz, the last whorl large, raised 
above the first two, dilated in front, marked only with transverse 
growth-plications ; suture deeply impressed, bordered below by an 
ill-defined granular zone; columella margin descending in a 
younded curve; labrum simple, projecting in front, receding 
above and below ; aperture broadly dilated. 
Alt. 7:25, diam. maj. 12, diam. min. 8°5 mm. 
Aperture : alt. 7°25, diam. 7°5 mm. 
Hab. Kiduha, Lake Mutanda, S.W. Uganda. (Robin Kemp.) 
* For explanation of the Plates see p. 810, 
