14 SOWERBY : MARINE SHELLS OF S. AFRICA. 



arcuatus ; posticus elongatus, declivis ; inargo veniralis 

 leinter arcuatus; liga77ientum externum ■parvum ; caido 

 iwriiialis. 

 Dlam. antero-post. 13, umhono-majg. 8, crass 3 ;;////. 



A small species of a thin horny substance, rayed with dark 



purplish brown. 



Lucina columbella Lamarck. 



Donax serra Gmelin. — A large species, common on the 

 South African coast, which seems to be its principal, if 

 not exclusive, habitat. 



Donax sordida Reeve. — A very distinct species which I have 

 not seen from any other locality. 



Donax exarata Krauss. — A remarkable species with oblique 

 ridges ; allied to D. Madagascariensis., but distinct, and I 

 believe confined to the South African coast. 



Gastrana Guinaica Chemnitz. — More angular than the 

 British species. 



Dosinia consobrina Deshayes. 



Dosinia hepatica Lamarck. 



Venus verrucosa var. capensis. — Transversely oblong as 

 compared with the British and Mediterranean specimens. 



Tapes corrugafa Deshayes. — A curiously sculptured species, 

 common at the Cape. 



Tapes paupercula Chem7iitz. 



Cardita (Thecalia) concamerata Brug. — A very remark- 

 able sub-genus, represented by only one species which 

 seems to inhabit exclusively South African and Australian 

 waters. It has been quoted (I believe erroneously) as 

 West Indian. 



Cardium Natalense Krauss. 



Modiola capensis Krauss. 



Modiola auriculata Krauss. 



Area lactea Linn. — Differing but little from British specimens. 



Area obiiquata Gray. 



Area Kraussi Phil. 



J.C, vi., Jan., 1889. 



