58 MARINE SHELLS OF SOUTH AFRICA. 
GASTRANA ABILGAARDIANA, Spengler = G. Guinaica (Chem- 
nitz), Conch, Cab. vol. x. p. 170, figs. 1651-1653.—Port 
Elizabeth. 
Donax SERRA, Chemnitz, Sowb. Thes. Conch. vol. iii. 
pl. 282, fig. 87.—Common at Port Elizabeth. 
Donax sorpipus, Reeve, Conch. Icon. (Donax), pl. 5, 
fig. 32.—Cape (Krauss), Port Elizabeth. 
Donax ELoNGaTUS, Lamarck, Sowerby, Thes. Conch. 
vol. ii. pl. 280, fig. 12.—Port Elizabeth. 
Donax Exaratus, Arauss, Sudafr. Mol. p. 6, pl. 1, fig. 5. 
—Natal (Krauss), Port Elizabeth (rare). 
Donax seEmisuLcaTus, Hanley, Conch. Icon. (Donax), 
pl. 4, fig. 25.—Indian Ocean, Port Elizabeth (rare). 
Donax OWENI, Gray, Sowb., Thes. Conch. vol. iii. pl. 1, 
fig. 8.-—Port Elizabeth (rare). 
Donax BiparTiTus, Sowerby, nov. sp., pl. 3, fig. 74.— 
Testa subtrigono-oblonga, valde inzequilateralis, solidiuscula, 
mediocriter compressa, albida, obscure pallide violaceo 
radiata, antice levigata, nitens, postice transversim crenato 
lirata, obscurissime radiatim sulcata; umbones acuti, pro- 
minentes. Lunula leviter impressa; margo dorsalis anticus 
elongatus, leviter declivis, posticus abrupte truncatus; area 
postica dense clathrata; pagina interna albida, antice ob- 
scure violaceo radiatim tincta, postice nigro-purpureo uni- 
radiata; cardo normalis. 
Diam. antero-post 20, umbono marg. 11 millim. 
This species, of which Mr. Ponsonby has shown me several 
specimens, may be distinguished by the intense violet ray 
inside the posterior end. Rather less than half the valve is 
sculptured, and the remaining portion smooth and polished. 
CYTHEREA (TIVELA) CoMPRESSA, Sowerby, Thes. Conch. 
vol, ii. pl. 128, figs. 38, 34.—Large, well-grown specimens 
of this species from Port Elizabeth [at first thought distinct, 
but upon further comparison am unable to separate them. 
C. polita (Sowerby) is merely the young of this species. 
CYTHEREA (TIVELA) DOLABELLA, Sowerby, Thes. Conch. 
vol. ii. pl. 127, fig. 15.—Port Elizabeth. 
