6 MARINE SHELLS OF SOUTH AFRICA. 
Icon. fig. 68.—This species is peculiar to South Africa. It 
varies very much in the prominence of the longitudinal ribs, 
which in some specimens are obsolete. 
PLEUROTOMA (CLIONELLA) SEMICOSTATA, Aiener, Icon: 
Coq. Viv. p. 39, pl. 19, fig. 1—Cape coast (Krauss). 
PLEUROTOMA (CLIONELLA) ROSARIA, Eeeve, Conch. Icon. 
sp. 314.—I doubt very much whether this can be properly 
separated from the extremely variable P. sinuata. 
PLEUROTOMA (CLIONELLA) Batrstowl, Sowerby, pl. 1, 
fig. 6; Journ. of Conch. vol. v. p. 8.—Port Elizabeth. 
PLEUROTOMA (CLIONELLA) Bornul, HL. A. Smith, pl. 4, 
fig. 77; Ann.and Mag. of Nat. Hist. 1877, vol. xix. p. 499.— 
Cape of Good Hope. 
PLEUROTOMA (CLIONELLA) TRIPARTITA, 7. A. Smith, pl. 4, 
fig. 83; Weinkauff, Conch. Cab. ed. 2, 120, pl. 26, figs. 12 
and 13.—Tyron thought this to be P. obesa (Reeve), but 
it is quite unlike it, and certainly belongs to a different 
section of the genus. 
PLEUROTOMA (CLIONELLA) SUBVENTRICOSA, EZ. A. Smith, 
pl. 4, fig. 76; Ann, and Mag. of Nat. Hist. 1877, vol. xix. 
p. 500.—Various South African localities. 
PLEUROTOMA (CLIONELLA) stGILLata, Reeve, Conch. Icor. 
sp. 363.—Cape of Good Hope (Reeve). 
PLeuROTOMA (CLIONELLA) DIVERSA, LE. A. Smith, pl. 4, 
fig. 79; Ann. and Mag. of Nat. Hist. 1882, vol. x. p. 207. 
—Port Elizabeth. 
PLEUROTOMA (CLIONELLA) CAFFRA, E. A. Smith, pl. 4, 
fig. 80; Ann. and Mag. of Nat. Hist. 1882, vol. x. p. 209. 
—Port Elizabeth. 
PLEUROTOMA (CLIONELLA) Kraussu, 2. A. Smith, pl. 4, 
fig. 78; Ann. and Mag. of Nat. Hist. 1877, 4, vol. 19, 
p- 500.—Port Elizabeth, &e. 
DEFRANCIA AMPLEXA, Gould, Proc. Boston Soc. Nat. Hist. 
vol. vii. 338.—Simon’s Bay and Port Elizabeth. 
DEFRANCIA CAPENSIS, £. A. Smith, pl. 4, fig. 84; Ann. 
and Mag. of Nat. Hist. 1882, vol. x. p. 296.—Port Eliza- 
beth. 
