g4 Pelecypoda. — Ostreacea. 



imbricatis undulatis; valva superior plana aut convexa, margine valde denticu- 

 lato; valvae griseae, intus albidae. — Diam. 80 mm. 



Distrib. : Atlanticum: Lusitanicum, litora Africae; ins. Canariae, Madeira. 

 — Fossilis in stratis tertiariis Italiae et Siciliae. 



Habit. : Litora Galliae (Dubbeuil), Aigues-Mortes (Clemext), Marseille 

 (Ancey), fort S. Jean, La Joliette (Makion), S. Tropez, Porquerolles (Locard)*^ 

 Cannes (Montekosato) ; Nizza (Vekany, Risso); litora pedemontana (Jeffreys); 

 Corsica (Paybaudeau, Requien); Sardinia: Bonifacio (Rolle); Spezia (Tappakone- 

 Canefki); Sicilia (Philippi); Adria: Venezia (Gr. v. Martens, Weinkauff), Trieste 

 (Gbube), Zara (Sandbi); Morea (Deshayes); mare Aegeum: Paros, Lycia (Fokbes). 



m 6. Ostrea ruscuriana Lam. (0. coymicopiae Wkff., nec L.). ,,Testa 

 crassa, oblongo-ovata, sub nate cucullata, intus albida, limbo interiore purpureo- 

 nigricante; septo marginis inferioris recto" (Lamarck). 



Habit. : Litora Algeriae (Lamakck, Weinkauff). 



7. 0. senegalensis Gm. („le Royel" Adans.). „Testa rotundata, com- 

 planata, sublaevigata, valva inferiore plana, superiore convexiuscula, rubro-fusca: 

 umbonibus minimis vix prominentibus, valvis ad cardinem granulosis" (Lamakck). 



Distrib. : Litora senegalensia Africae. 



Habit. : Sidi Feruch, litus Algeriae (Weinkauff). 



8. 0. rosacea Desh. (O. parasltica Chemn. , 0. pUcaMa var. C. Lam.). 

 ,,Testa suborbiculari , valva inferiore profunde plicata, superiore subplana, plicis 

 marginalibus instructa, in disco nullis, rubro-rosea; umbonibus minimis acutis" 

 (Deshayes in Lamarck). 



Distrib. : Litora Africae senegalensia? (Deshayes). 



Habit. : Alger, poi^tus (Weinkauff). 



Subgen. Gryphaea Lam. Valvae longitudine iuaequali, sinistra aflixa, in 

 statu adulto saepe libera, rostro saliente, incurvo aut spiraliter antrorsum (proso- 

 gyro) aut retrorsum (opistliogyro) involuto; valva dextra plana aut concava, 

 brevis, operculiformis. 



m 9. 0. cochlear Poli (0. italica Desh.). Testa suborbicularis, tenuissima, 

 sed solida, rosea, membranis fere nullis; valva inferior maxime convexa, semi- 

 globosa, superior multo minor, concava, quasi operculiformis ; altero latere prope 

 cardinem denticulato; rostrum breve, latiusculum, angulo terminatum. — Long. 

 50 mm, lat. 36 mm. (Var. Grypliaca navicula Montee.) — Fossilis (0. navica- 

 laris Brocchi) in stratis tertiariis Italiae, Algeriae, Graeciae. 



H a b i t. : Cartagena (Jeffreys) ; ins. balear. : Palma, Ciudadela (Hidalgo) ; 

 Alger (Weinkauff), Jijeli, Bona, Benzert, Easel Amusli, „Adventure Bank", 

 Tunis („Porcupine", Jefpreys); litora Galliae (Dubreuil), Cette (Granger), 

 Aigues-Mortes (CLfiMENT), Toulon (Gay); Nizza (Eisso); Corsica, ad 100 org. 

 prof. (Payraudeau, Eequien) ; Napoli (Scacchi), Sicilia (Philippi), zona coralli- 

 gena maris siculi, Palermo (Monterosato), Messina, communis (Seuuenza); Adria: 

 litora Dalmatiae (Brusina); Morea (Deshayes); insulae maris Aegei, rar. (Forbes). 

 Forma Monterosati De Greg. „valva inferiore niolto turgida, internameute 

 molto cava con una larga macchia paonazza piu o nieno brnua". 



Fornia lineocostnta Dk Greg. „10 nini , rosea, ornata di qualche costoletta 

 esile diretta, raggiante filiforme; nell' interno paie gialListra." — Palermo. 



2. Fam. ANOMIIDAE Stol. Palpi orales obsoleti, cum branchiis con- 

 nascentes; pallium apertum, sine ocellis; branchiae externae margiue lato repli- 

 cato ; pes parvus cylindricus , sulcatus , in cavnm infundibuliforme terminatus ; 

 byssus magnus, lobum dextrum pallii perforans; valvae adnatae, superior convexa, 



