SOUTH AFIJICAN MAKINE MOLLUSCA. 61 



versus paulo incurva, deinde subexcurva, postice oblique 

 arcuatim truncata, versus umbones pallida, viridi-albida, 

 deinde fuscescens vel fumosa, costis radiantibus circiter 15, 

 baud squamulatis, instructa, lineis incremeuti tenuissimis 

 sculpta ; valva3 tenues, supra latus ventralem apicem versus 

 oblique corrugatse. 



Longit. 155 mm., diam. obliqua max. 86, cross. 20. 



H ab . — Durban. 



Although somewhat resembling P. madida Reeve, I think 

 this species may be separated. It is not quite of the same 

 form, the ventral margin being less concave, the coloration 

 is different, the costee are more prominent, and the lines or 

 lamellae of growth are finer. 



One of the two specimens at hand is more obliquely truncated 

 posteriorly. The ribs in the other specimen are in certain 

 lights of an obscure golden tint. 



■^Modiola tenerrima Smith, 



Modiola tenerrima Smith, 'J. of Malac.,' vol. xi, p. 42, 

 PI. Ill, fig. 26. 



Hab.— Port Alfred. 



"^ Hochstetteria velaini Sviith. 



Hochstetteria velaini Smith, 'J. of Malac.,' vol. xi, 

 p. 42, PI. Ill, fig. 24. 

 Hab.— Port Alfred. 



* Hochstetteria limoides Smith. 



Hochstetteria limoides Smith, 'J. of Malac.,' vol. xi, 

 p. 42, PI. Ill, fig. 25. 

 Hab.— Port Alfred. 



"^Crenella striatissima Soirerhij. 



Crenella striatissima Soicerhy, ' Marine Invest.,' vol. iv, 

 p. 3, PI. VI, fig. 1. 



Hab. — Ofl^ Cape Colony, 56 and 100 fathoms. 



