SMITH : MARINE SHELLS FROM PORT ALFRED. 



43 



Quite distinct from any of the other S African mussels. The most 

 remarka' le feature is the prettily dentate dorsal margin of the valves, the 

 crenulation extending on both sides the iimhones. The two or three radia- 

 ting sulci at the anterior end are visible within the valves also. 



Limopsis pumilio, nsp. 

 PI. iii, figs. 27, 28. 



Testa minima, trigona, crassa, alba vel rufo maculata, laevis ; margo dorsi 

 utrinqiie valde declivis, rectiiisculus, ventralis curvatus ; umbones peculiares, 

 cj asi truncati ; cardo crassissimus, dentibus anticis tribus, posticis quaternis 

 mnnitiis; sulcus ligamenti profundus; pagina interna radiatim striata; cica- 

 trices profundae. 



Longit. 3 millim., alt 3.25. diam. 2. 



Remarkable for the strength of the hinge and the peculiar umbones 

 which have the appearance of being truncate, but, when the tip is closely 

 examined, appear to have a circular cap. 



Lima perfeeta, nsp. 

 PL iii, fig. 29. 



Testa parva, convexa, alba, radiatim costata et sulcata, costis granosis, sulcis 

 aeqnanti ms, clausa, antice oblique truncata, profunde excavata, postice et 

 inferne regulariter curvata ; valvae crassiusculae ; area dorsalis parva, excavata, 

 fossa ligamentali obliqua triangulari sculpta; pagina interna radiatim sulcata, 

 ad marginem late dentata. 



Longit. 12 millim, alt. 15, diam. 10. 



The costae are about eighteen in number, exclusive of a few finer ones 

 near the posterior margin, and those in the anterior excavation which are 

 also finer than those on the central part of the valves. 



