152 Annals of the South African Musewm. 
(axis 6’, diam. 8'’’) with a white mouth is not uncommon at Bredas- 
dorp, while a large white form (axis 1", diam. 1” 3’) exists at 
Mossel Bay.” 
Chemnitz’s figure (1786) is almost unrecognisable, while Lamarck 
(1822) described globulus for lucana, and Rossmissler (1837) figured 
globulus as the last-mentioned species. Krauss (1848) included 
lucana, Lam., in the synonymy of globulus, Mill., but unaccountably 
omitted lwcana, Miill., altogether from his catalogue. 
986. DorcASIA PONSONBYI, Fulton. 
1910 Dorcasia ponsonbyt, Fulton, A.M.N.H. vi. p. 212. D. 
Type in British Museum. 
Hab, Care or Goop Hops (fide Fulton). Mossel Bay (Gibbons), 
Sus-Genus TULBAGHINIA, Melv. & Pons., 1898. 
(A.M.N.H. i. p. 28.) 
Type of Sub-Genus, D. isomerioides, M. & P. 
287. DorcASsIA ISOMERIOIDES, Mely. & Pons. [S.A.M.] 
1898 Dorcasia (Tulbaghinia) tsomerioides, M. & P., A.M.N.H. i. p. 28. 
DLS; LAO) Dey 
Type in British Museum. 
Hab. Carre or Goop Hors. Winterhoek Mt., Tulbagh (Marloth). 
Owing to its considerable divergence from the type, I append the 
description of a fine specimen in the South African Museum. 
Shell depressed-globose, deeply and openly umbilicate, thin, trans- 
lucent, thickly covered above with rough, curved striz, which are 
continued more smoothly beneath. The upper portion moderately 
glossy, of dark olive-brown horn colour, beautifully marked on the 
earlier whorls with pale yellow dots and blotches, merging later into 
irregular, interrupted concentric streaks ; the earlier whorls similarly 
marked on the underside, but the last is paler, of a greener tint, 
glossy and unmottled. The interior shows plainly the colour and 
markings of the epidermis. Spire but little produced, apex flattened. 
Whorls 44, rapidly increasing, rounded, with no trace of carination, 
Aperture ovate, peristome white and glossy, a little thickened and 
reflexed. The columellar margin, half-way up between the base of 
the aperture and the umbilicus, shows trace of two small pro- 
tuberances on its inner side; above these it becomes more widely 
reflexed, and forms a sharp angle of about 95 degrees, projecting 
