SIX NEW MARINE SHELLS FROM SOUTH AFRICA. 



By J. K. i.K B. TOMLIN, M.A. 



(Read before the Society, 6th April, 4th May, 7th Septeml)er, 1921). 



Plate VIII. 



Cryptodon eutornus nov. sp. Plate VIII, fig. 5. 



This name is proposed for the fine and well known South African 

 bivalve that has hitherto passed as Lzicina globosa Forskal, Forskal's 

 species has recently been shown by Lamy (Bull. Mus. H.N. Paris, 

 1915, p. 155) to =Lud?ia lactea L., and in any case Forskal's descrip- 

 tion of the hinge shows that his shell was not C. eutornus^ which has 

 a hinge typical of Cryptodon. The shell is putty-coloured, showing 

 traces of a yellowish-brown epidermis, remarkably tumid as the 

 dimensions will show ; dorsal margin very nearly straight ; ventral 

 margin regularly rounded posteriorly till it joins the dorsal margin, 

 but anteriorly the shell is narrowed into the form of a very blunt 

 wedge. 



Length, 66 mm. ; height, 53 mm. ; diam., 49 mm. 



Habitat, Port Alfred (Turton) ; Swartkop River (Holub, fide 

 Bartsch); Durban (McClelland). 



Type in coll. Tomlin. 



Clementia mcclellandi nov. sp. Plate VIII, fig. 6. 



This splendid species bears a considerable resemblance to the 

 Australian papyracea Wood, but attains a much larger size. It has 

 the same sort of sculpture — broad, rather distant, concentric ridges, 

 which are most strongly marked on the umbones, and gradually 

 become obsolescent towards the ventral margin ; these ridges and 

 the interstices between them are irregularly and closely grooved with 

 rather fine lines. 



The umbones are very prominent and swollen and much produced 

 towards the anterior margin. Posterior dorsal margin slightly curved 

 and sloping steeply. Pallial sinus deep and tongue-shaped. 



Length, 80 mm. ; height, 78 mm. 



Habitat, Muizenberg (McClelland), single valves only. 



^Ve have great pleasure in dedicating it to its energetic discoverer. 



Type in coll. Tomlin. 



In the Annals of the Natal Government Museum, vol. i, part i, p. 28, 

 Smith records Marginella angustata Sow. from 42 fathoms, off Cape 

 Point, and remarks : — " By a curious accident this species was 

 wrongly recorded by Mr, Sowerby under the genus Ancilla." It was, 



