44 SYRIAN MOLLUSCAN FOSSILS. 



backward towards the lower-posterior margin : umbones inclined forward 

 and subterminal; beaks inflected and widely sundered at their apices, which 

 are acute and in the complete shell were probably directed upward. The 

 lunnlar region is excavated into a wide cordate pit, which agrees closely with 

 that of the recent Isocardia or Linn. The hinge line is represented by a 

 thin sinuous ridge similar to that which may be seen in an artificial cast of 

 J. cor. Elevations corresponding to the anterior muscular and pallial im- 

 pressions, and to the little pits above the latter, show all these to have been 

 deep and characteristic of the genus. 



The four specimens, all interior casts, differ from each other but slightly, 

 except in the shape of the posterior part, which is somewhat variable in its 

 proportions. 



The dimensions of the specimen represented by figures 2 a, b are: length, 

 Gl mm. ; height, 73 mm. ; thickness, 72 mm. ; — of that shown by figure 2 c : 

 length, 62.V mm. ; height, 04 mm. ; thickness, 71mm. 



Collections Merrill, Congregational House, and Thomson. 



Locality and Position. — Beirut district ; probably from the fourth of 

 Fraas's nine zones, that of the Turonian Cardium bed, which abounds in 

 casts of this genus. 



Cyprina orientalis, sp. nov. 



Plate V, figs. 3 a, b. 



Nucleus oblongus, inflatus, ceqruivalvis (?), incequilaieralis : lotus antieum breve, 

 sub umbonibus emarginatum ft infra emarginationeni paulo produclum ac subros- 

 I ml urn ; regio lunularis vdlde ezcavata: laius posticutn elongaium, rotunde truncatum; 

 area angusta, profunda, /mini marginata : umbones admodum prominentes, prorsum 

 i ncli nut i ; n fiirrs nnii/ni. crassi, retusi, incurvi, approximati: margo veniris subrectus: 

 prominentias impressionibus musculorum anteriorum et pailii congruentes insignes. 



Cast oblong, inflated, equivalve (?), inequilateral : anterior side short. 

 emarginate beneath the umbones, and below the emarginatior slightly pro- 

 duced and subrostrate ; lunular region strongly excavated: posterior side 

 elongate, roundly truncate; area excavated but not defined by a border: 

 umbones very prominent and inclined forwards; beaks large, swollen, blunt, 

 incurved, approximate: ventral margin almost straight: elevations corre- 

 sponding to the anterior muscular and pallial impressions protuberant. 



Single specimen, a cast. Length, 84 mill.: height. 69 mm.; thickness, 

 G4 mm. 



