SO\VERCV : MARINE SHELLS OF SOUTH AFRICA. ll 



PELECYPODA. 

 Basterotia obtusa Sowh., n. sp. 



Testa (Equivalvis, inaquilateralis, qiiadrato-siibovata, leviter 

 inflata, antice abbrcviata, rotunde truncata, postice obtuse 

 angulata, oblique producta, sordida, conceiitrice dense striata. 

 Umbones appivxiiiiati, leviter promine7ites. Cardo in utraque 

 valva deiiiem uniaan valde productuin, leviter excurvatiim, 

 postice lamina abbrevitata crassiuscula angiilato-elevata 

 munitus. Impressiones 7nusculares vix perspicua. 



Antero-post. 12, unibono-marg. 8 millini. 



Hab. Durban. 



The genus Basterotia Mayer in Homes ('Die Fossilen 

 Mollusken des Terticer-Beckens von Wein,' vol. iv., p. 40, 

 pi. 3, fig. II a-g, 1859) was founded on a fossil species 

 B. corbuloides Mayer. The recent type is Corbula quad- 

 rata Hinds ('Proc. Zool. Soc.,' 1843), for which Recluz 

 proposed the generic name of Eucharis ('Journal de Con- 

 chyliologie,' vol. i., p. 168, 1850); name pre-occupied by 

 Latreille in 1804. The new species Basterotia obtusa re- 

 sembles B. corbuloides in form, but instead of a keel from 

 the apex to the posterior margin, it has only a very obtuse 

 rounded angle. 



Pandora dissimilis Sowb., n. sp. 



Testa fere cequivalvis, incequilateralis, oblonga compressa, pos- 

 tice latior, antice angustior, utrinque obtuse siibangulata ; 

 extus sordida, concentrice irregulariter rugata. Margo dor- 

 salis acutus ; anficus curtus leviter declivis ; posticus longus 

 rectiusculus ; lunula nulla. JMargo vent rails leiiter flexuo- 

 sus. Valvis utrinque leviter liiantis. Umbones acuti. Cardo 

 lira longa crassiuscula, oblique desce/idens, liganientuni fer- 

 ente ; in valva dextra dente unicus elevatus claviforniis 

 instrucius. Pagina interna niargaritacea iiidescens ; im- 

 pressiones musculares duie subcirculares. 



Antero-post. 4S, umbono-marg. 2j millim. 

 Hab. Sea Point, Cape To7vn. 



After some hesitation I have decided to place this 

 remarkable species in the genus Pandora. It differs very 



