Reference List of South African Non-marine Mollusca. 111 
Genus MICROKERKUS, Godwin-Austen, 1912. 
(A.M.N.H. ix. p. 128.) 
Type of Genus, M. symmetricus (Crvn.). 
178. MickoxerKus PoNnDoENSIS, Godwin-Austen. [S.A.M.] 
1912 Mierokerkus pondoensis, G.-Aust., A.M.N.H. ix. p. 128. pl. 4, 
Teese Al sia: 
Type in British Museum. 
Hab. Care or Goop Horr. Kentani (Miss Pegler). _ 
179. MickoKERKUS SYMMETRICUS (Craven). 
1880 Helix symmetrica, Crvn., P.Z.S. p. 614. pl. 57, £.2. DF. 
1887 ,, (Pella) symmetrica, Crvn., Tryon, Man. of Conch. iii. 
p: LOB ply al) £. 99) “DF. 
1898 Pella symmetrica, Crvn., Stur., $.A. Moll. pp. 39, 40. N. 
1912 Microkerkus symmetricus, Orvn., G.-Aust., A.M.N.H. ix. 
Pea sep Ae pl, Be f4. © yA 
Type in British Museum. 
Hab. Transvaat. Lydenburg (Craven). Pretoria (McBean). 
SuB-Faminy ZONITINA, Pilsbry, 1898. 
(Nautilus, xi. p. 128.) 
Genus VITREA, Fitzinger, 1833. 
(Beitriige zur Landeskunde Oesterreichs u.d. Enns, Wien, iii. Desous) 
(= Hyalinia, Charpentier, 1837, nec Schumacher, 1817.) 
Type of Genus, V. diaphana (Studer). 
180, VirrEA cRysTALLINA (Miller). [S.A.M.] 
1774 Helix crystallina, Mill., Verm. ii. p. 23. D. 
1805 ,, cristallina », »Drap., Hist. Moll. Fr. p, 118. pk s; 
f. 13-18. D.F. 
1821 ,, eburnea, Hartm., Neue Alp. i..p. 234. 
hs » erystallina, Miull., C. Pfr., Syst. Anordn. deutsch. L.-u. 
W. Schn. p. 46. pl. 2, f. 36... DF 
1829 ,,  vitrea, Brown, Edinb. Journ. Nat. & Geogr. Sci. i. p. 12. 
Diode eto... Dif. 
1830 ,,_—crystallina, Mill. (=vitrea, Brown), Alder, Cat. New- 
castle, p. 11. D. ; ; 
