ex agris Aegyptiae nummuliticis- 291 



umbone prominente, pleriimque leviter incurvo; cardine 

 lato, longiiisculo, triaagulari, canali latissimo, pauliim pro- 

 fuudo, areis validis, siibplanis; marginibiis ex toto laevi- 

 bus; cicatricula musculi maxima, transversa, semilunari; 

 valva superiore plana, epidermide subregiilariter radiata; 

 cardine lato, piano; marginibus laevissimis, — Long. 60, 

 lat. 50 millim. 



Parisianum II, c: Mokattam (2), Wadi el Tih (3) 

 et regio ad oecidentem lagi El Qerun vergens. (4) Mus. Tur. 



E Serie Ostreae Germaini. 



Ostrea Aschersoni, May.-Eym. 



0. testa ovato-rotundata, leviter obliqua, compressa; 

 valva inferiore crassula, irregulari, dorso pro parte affixa, 

 irregiilariter crassilamellosa ; costis non multis, irregula- 

 ribus, depressis, plerumque obscuris, pro parte a lamellis 

 leviter crispatis; umbone prominente, obtusulo; cardine 

 leviter obliquo, triangulari; canali areas aequante, areis 

 validis, planis; marginibus superne tenue scrobiculatis ; 

 cicatricula musculi majuscula, semicirculari; valva superiore 

 plana, multilamellosa, obscure radiata; cardine lato, piano ; 

 marginibus superne crenulatis. — Long. 62, lat. 48 millim. 



Parisianum I,a?:Nokba, oasis Farafrah. (2)Mus.Mon. 



E Serie Ostreae Polyphemi. 



Ostrea fluctuosa, May.-Eym. 



0. testa angusta, leviter arcuata ; valva inferiore 

 crassissima, dorso obtuse carinata, gibbosa; costis novenis, 

 ad umbonem minutissimis, dorso subevanescentibus, in- 

 ferne valde inaequalibus, alternantibus, majoribus crassis- 

 simis, a lamellis concentricis crassis, fluctuosis, irregula- 

 ribus, squamoso-spinosis; umbone longo, angusto, obliquo; 

 cardine angusto, canali longiusculo, profundo, areis an- 

 gustissimis; marginibus superne leviter scrobiculatis, in- 



