244 Annals of the South African Musewm. 
517. Istpora compra, Mely. & Pons. [S.A.M.] 
1903 Isidora compta, M. & P., A.M.N.H. xii. p. 606. pl. 32, f£.14. DF. 
Type in British Museum. 
Hab, Transvaau. Boksburg (McBean, per Burnup). 
Orance Free State. Kopjes; Morgendal; Valsch River, Lind- 
ley (Connolly). 
MasHonatanp. Enkeldoorn District (Miss Sharpe- Young). 
Near J. tropica (Krs.), from which it can be distinguished by the 
curve of the outer lip, which may be called normal and regular in 
tropica, but in compta is usually distinctly flattened and almost 
incurved for a short way below the suture. 
518. Istpora contTorTA (Michaud). 
1829 Physa contortus, Mich., Bull. Soc. Linn. Bordeaux, iii. p. 268. 
plate, f.15,16. DF. 
1831 ,, contorta, Mich., Complément Hist. Moll. Fr. p. 83. 
plelGs ais Ol Oo oe 
1838 - M, Desh., Hist. nat. An. s. Vert. viil. 
p. 403. WD. 
184d 3" = a " Kiist., Conch. Cab. (Limn.) p. 8. pl. 1, 
{f,.9-l1l. DF. 
1864) 5 33 5 Bet., Mal. Algérie, ii. p. 171. pl. 10, 
f. 38-40. DF. 
1870 ~ is Ex Blanf., Obs. Geol. and Zool. Abyss. 
pottZ., JN. 
1874 Isidora _,, Jick. (=tropica, Krs., and cyrtonota, 
Bgt.), Fauna N. Dees 203. pl. 3, f. 4. pl. 1, f. 14: Ddiek, 
», Physa contorta, Mich., Sow., Conch. Icon. pl. 11, f.92. DF. 
1886 “A 2, as Cless., Conch. Cab. p. 314. DN. 
1908 Istdora ¥ a: (=sericina, Jick.), Neuville & 
Anthony, Ann. Sci. nat. Paris, viii. pp. 274, 275. NF. 
Type—ubi ? 
Hab. Care or Goop Horr. Quarry near Fort England, 
Grahamstown (Farquhav). 
A set of hardly mature shells from the above locality appear 
inseparable from Michaud’s variable species, which is widely 
diffused through the South of Europe and North Africa, and 
recorded from West Africa and the Euphrates. Jickeli (1874) was 
very possibly right in placing tropica in the synonymy; but I have 
so far been unable to confirm his views, and as the last-named 
species is, typically, a well-marked one in South Africa, with a 
