158 SOWERBY : MARINE SHELLS OF SOUTH AFRICA. 



at present I have not been able to discover any dis- 

 tinguishing character. 



Modiola lignea Reeve. 



Modiola elegans Philippi. Much larger than the Indo- 

 Pacific specimens. 



Modiola petagnas Scacchi. 



Modiolaria discors Linn. A common European species. 



Mytilus perna Linn. Presenting considerable variation in 

 form. 



Mytilus eduiis Linn. var. {=M. meridionalis Krauss). 



Mytilus afer Gmel. 



Pinna pernula Chemnitz. 



Avicula (Meleagrina) capensis Sowerby nov. sp. (Plate iii, 

 fig. 10). 

 A. testa solidula, ohlonga vel ovata snb-quad7-ata, plus 

 minusve tortuosa, plano-convexa, ubiqiie concent?-ue iri'egulari- 

 ter laminata, olivacea, m'gro-fusco obscure radiata, rostrum 

 latum, prominens ; area antica in valva sinistra latisinuata, 

 valide incrassata ; cauda lata, brevissima, cum margine postico 

 angulo p(Bne recto Jicncta ; umbones curvati ; area cardinalis 

 recta. 



This species has been quoted by Dunker as a variety 

 of A. niargaritifera, but the form is very distinct and con- 

 stant. It may be at once recognised by its oblong form, 

 and the remarkable broad sinus under the beak. 



Teredo (Hyperotus) nucivora Spengler. Several specimens 

 of this remarkable shell have been found in groups attached 

 one to another. 



Ostrea iridescens Gray. 



Pecten pusio Linn. In my last paper I noted a white variety 

 of this species. I have since seen several differently coloured 

 specimens from the Cape. I regard the Pecten tinctus and 

 altus of Reeve as belonging to this species. 



Pecten (Vola) capensis Gray. A rare species seemingly 

 confined to South African waters. 



J.C, vi., Oct., 1889. 



