62 SYRIAN MOLLUSCAN FOSSILS. 



Locality and Position. — Beirut district. Not known to Fraa.s, but found 

 by Lartet assez ripandue en Palestine. Since Coquand refers it, in Algeria, 

 to the same horizon {Tetacje rhotmnagien) with the last species, like that it 

 is probably from the zone of Ammonites Syriacus, in Lebanon. 



Vola sp. i 



A single incomplete lower valve, less convex than the last two and pro- 

 portionally wider. Length, about 45 mm. ; height, about 50 mm. The ribs 

 are about twenty in number, and are wide, except those of the anterior and 

 posterior sides, which are narrower. All are very flat, and would entitle the 

 species to the name of Vola planicosta if the specimen were complete enough 

 to warrant a specific description. The upper (left) valve is unknown to us. 

 Coll. Merrill. 



Localiti/ and Posiiion. — Beirut district ; from a chnlky marl, probably 

 Senonian. 



Ostrea Syriaca? Conrad. 



Ostren F^i/rii/ra Conrad, Official Report, p. 212, PI. ii, fig. 12. 



Two complete specimens of a small Oyster, adhering to each other and 

 giving evidence of having been attached at the umbones. They answer 

 better to the description of this species than to that of any other. Greater 

 diauieter of the larger, 47 mm.; of the smaller, 45 mm. Coll. Thomson. 



Locality and Position. — Probably from the Beirut district; from a yellow 

 marl, Turonian. 



Ostrea (Alectryonia) alicula, sp. nov. 



Plate VI, figs. 3 a, b, c. 



Testa oblique cnneifonnis ; valva superior fere j^lanu, (id cardinem versus paii- 

 lulum convexa et concentrice tenuiter lamellosa, alioqui vix concava et plicis radiantibus 

 Mis demissis nonnunquani dichoiomis notata ; valva inferior alte fornicata, imihone 

 produdo affixa, costis angustis acidis crrbris dichoiomis mnnita. 



Shell obliquely cuneiform ; upper valve nearly flat, towards the hinge 

 somewhat convex and concentrically delicately lamellose, for the rest slightly 

 concave and having the lamellae crossed by wide, low, radiating folds, some- 

 times dichotomous ; lower valve highly arched, affixed by the elongated 

 umbo, and furnished with narrow, sharp, close-set dichotomous ribs. 



Two specimens, both figured. Dimensions of the right-hand individual of 

 the doublet: length, 16 mm.; height, 40 mm.; thickness, 15 mm 



