58 MARINE SHELLS OF SOUTH AFRICA. 



GASTRANA ABILGAARDIANA, Spennler = G. Guinaica (Chem- 

 nitz), Conch. Cab. vol. x. p. 170, figs. 1651-1653. Port 

 Elizabeth. 



DOXAX SERRA, Chemnitz, Sowb. Thes. Conch, vol. iii. 

 pi. 282, fig. 87. Common at Port Elizabeth. 



DONAX SORDIDUS, Reeve, Conch. Icon. (Donax), pi. 5, 

 fig. 32. Cape (Krauss), Port Elizabeth. 



DONAX ELONGATUS, Lamarck, Sowerby, Thes. Conch. 

 vol. iii. pi. 280, fig. 12. Port Elizabeth. 



DONAX EXARATUS, Krauss, Sudafr. Mol. p. 6, pi. 1, fig. 5. 

 Natal (Krauss), Port Elizabeth (rare). 



DONAX SEMISULCATUS, Hanley, Conch. Icon. (Donax), 

 pi. 4, fig. 25. Indian Ocean, Port Elizabeth (rare). 



DONAX OWENI, Gray, Sowb., Thes. Conch, vol. iii. pi. 1, 

 fig. 8. Port Elizabeth (rare). 



DONAX BIPARTITUS, Soiverby, nov. sp., pi. 3, fig. 74. 

 Testa subtrigono-oblonga, valde inaequilateralis, solidiuscula, 

 mediocriter compressa, albicla, obscure pallide violaceo 

 radiata, antice laevigata, nitens, postice iransversim crenato 

 lirata, obscurissime radiatim sulcata ; umboues acuti, pro- 

 minentes. Lunula leviter impressa ; margo dorsalis anticus 

 elongatus, leviter declivis, posticus abrupte truncatus ; area 

 postica dense clathrata; pagina iuterna 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. Eather less than half the valve is 

 sculptured, and the remaining portion smooth aud polished. 



CYTHEREA (TIVELA) COMPRESSA, Sowerby, Thes. Conch, 

 vol. ii. pi. 128, figs. 33, 34. Large, well-grown specimens 

 of this species from Port Elizabeth I 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) DOLAHELLA, Sowerby, Thes. Conch. 

 vol. ii. pi. 12V, fig. 15. Port Elizabeth. 



