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 pi'obably directed iipwaid. The 

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

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

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

 /. 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, difler from each other but slightly, 

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

 proportions. 



The dimensions of the sj^ecimen represented by figures 2 «, h are: length, 

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

 length, 62|mm.; height, 64 mm.; thickness, 71mm. 



Collections Merrill, Congregational House, and Thomson. 



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

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

 casts of this genus. 



Cyprina orientalis, sp. nov. 



Plate V, figs. 3 a, b. 



Nucleus ohlongus, inflatus, (eqidvalvis [1), inoeqidlateralis : latus aidieum breve, 

 sub umbonibus emarcjinatum et infra emarginationem paulo producluni ac siihros- 

 tratum ; regio lunularis valde excavata: latus imsticum elongation, rotunde tritncatum; 

 area angusia, profunda, hand marginata : vmbones udniodmn prominentes, prorsum 

 inclinati ; apices magni, crassi, retusi, inciini, approximali : margo ventris suhrcctus : 

 prominentice impressionibus muscidorttm anteriorum ct pallii congruentes imignes. 



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

 emarginate beneath the umbones, and Ijelow the emargination slightly pro- 

 duced and subrostrate ; luiuilar region strongly excavated: posterior side 

 elongate, roundly truncate ; area excavated Ijut 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 mm. ; height, 69 mm. ; thickness, 

 64 mm. 



