SOVVERBY : MARINE SHELLS OF SOUTH AFRICA. 377 



I know of no species bearing a very close comparison 

 with this. It is of much the same texture as M. semisiilcata 

 Desh., but higher and much more nearly sequilateral ; it is, 

 moreover, equally sulcated at both ends, the sulci, except- 

 ing near the umbones, crossing the valves. 

 Donax burnupi Sowb., n. sp. 



Testa eloiigata, aiigusta, leviter Jlexuosa, pallide fuhnr, obscure 

 fiisco 7odiata, polita ; area postica sulcata, sulcis iiui/ierosis 

 profjuidis oblique suh-verticalis. Margo dorsalis anticus 

 longus, lectiusculus, leviter declivis, posticus brevis, rotundatus. 

 Cardo normalis. Pagitia interna albida, utrinque violacco 

 tiiicta. 

 Anteropost. 26, umbono-inarg. 12 viillim. 

 Hab. Natal {Bjirnup). 



At first sight this shell resembles the European D. 

 politus, but it is distinguished by the remarkable posterior 

 sulci. 

 Cytherea (Caryatis) manillae Sowb., 'Thes. Conch.,' vol. 



ii., p. 634, pi. 136, figs. 180-181. Natal (a single valve). 

 Cytherea (Meretrix) zonaria Lamarck. —Sowb., 'Thes. 



Conch.,' vol. ii., p. 620, pi. 129, figs. 53-54- Natal. 

 Circe (Crista) divaricata Chem.— Sowb., 'Thes. Conch.,' 



vol. ii., p. 250, pi. 137, figs. 8-9. Natal. 

 Meroe contempta Smith, ' Proc. Zool. Soc' Natal. 

 Cardium tenuicostatum Lamarck. — Reeve, 'Conch. Icon.,' 



Cardiui/i, pi. 10, fig. 50. Natal. 

 Cardium rugosum Lamarck. — Reeve, 'Conch. Icon.,' Car- 

 dium, pi. 14, fig. 68. Natal. 

 Cardium rubicundum Reeve, 'Conch. Icon.,' Cardium, 



pi. 9, fig. 44. Natal. 

 Cardium papyraceum Chemnitz. — Reeve, 'Conch. Icon.,' 

 Cardium, pi. 2, fig. 9. Natal. A specimen in excellent 

 condition, with epidermis in raised ridges on the ribs. 

 Cardium turtoni Sowb., n. sp. 



Testa sub-oblique orbiculata, cequivalvis, incequilateralis, solidi- 

 uscula, parum inflata, albida, maculis fuscis diversiformibus 



