EDGAR A. SMITH. 



Tivela dunkeri {Rome)'). PI. I, figs. 9, 10. 



Venus (Cytherea) (Tivela) dunkeri R'umer, Novitat. Conch. 

 Monog. Yenus, p. 5, pi. v, fig. 1. 



Hab. — Port Sliepstone (H. Burnup). 



The locality of this species has not been hitherto recorded. 

 It is very donaciform in shape^ the anterior end being longer 

 than the posterior. It is described by Ronier as pale violet- 

 white, tinged with violet dorsally. His specimen was 25 mm. 

 in length, whilst the valves under examination, evidently 

 young shells, are only 15. 



The other S. African Tivelas are: T. natalensis Dkr. 

 1864 (=alucinans Sow. 1897), T. transversa Sow. 1897, 

 and T. polita Sow. 1851 (=dolabella Sow. 1851). 



Tivela rejecta n. sp. PI. I, figs. 11-13. 



Testa trigona, fere asquilateralis, sordida lactea rufo macu- 

 lata, distanter livido zonata, lineis incrementi striata; mar- 

 gines dorsales utrinque recte declives ; basalis late curvatus ; 

 latus anticum acute rotundatum, posticmn magis acuminatum ; 

 umbones acuti, purpureo tincti ; lunula vix definita, f usco- 

 purpurea tincta ; area postica f usco-purpurea ; pagina interna 

 fusco-purpurea, ad marginem basalem albida ; pallii sinus 

 angustus, trans medium procurrens. 



Longit. 15'5, alt. 11*5, crass, fere 7 mm. 



Hab. — South Africa. 



The shell here described may not be adult, but it differs 

 from the young of all the other South African Tivelas. T. 

 polita most nearly approaches it, but that species is higher 

 in proportion to its length, flatter, and the pallial sinus is 

 shorter and wider. The dorsal margins within the valves in 

 T. rejecta are of a deep purplish-brown with pale rays 

 beneath them, one on each side, which join the white ventral 

 margin. The reddish-brown markings on the outer surface 

 are irregular, but disposed more or less in transverse bands. 



