Aliae Ostreae novae quatuor, 



a cl, Sctiwßinfürtli in agris Aegyptiae nümmuliticis invenlae, 



auctore 

 C. Mayer-Eyniar, Prof. 



September 1890. 



E Serie Ostreae (Alectryoniae) loannae")- 



Ostrea (Alectryonia) pterygota, May.-Eym. 



0. (A.) testa irregulariter triangulari, longiuscula, 

 lubrecta, applanata, crassula, aequivalvi, valde inaequi- 

 saterali; latere antico longo, trimcato, fere recto, postico 

 obliquo-declivi, leviter concavo, inferne angulato, inferiore 

 oblique dilatato , leviter flexuoso ; costis circiter 30 , 

 orassiilis, subaequalibiis, fornicato-triangularibns, ad mar- 

 gines plerumque irregulariter dichotomis, ad umbonem 

 minoribus, densioribus, obliquis crenatisque; umbonibus 

 acutiusculis; cardine triangulari, canali lato, profunde, 

 areis latiusculis, planis; eicatricula musculi magna, semi- 

 circulari, leviter obliqua, marginibus antico et inferiori 

 approximata. — Long. 96, lat. 68 millim. 



Suessonianum I? : Chani et Naga el Schech, inter 

 Edfu et Esneh. (4) Mus. Berol. 



E Serie Ostreae (Alectryoniae) Janiis. 



Ostrea (Alectryonia) janigena, May.-Eym. 



0. (A.) testa mediocri, polymorplia, plerumque angusta 

 et leviter arcuata, raro superne latiuscula et inferne 

 dilatata, raro geniculata, tenui; valva inferiore convexa, 

 nmbone anguste aftixa, costis principalibus circiter 12, 



Clioff'at, 1886, Faune cretac. Portugal., p. 34, t. I. 

 XXXV. 2. 12 



