42 SYRIAN MOLLUSCAN FOSSILS. 



The valves at their anterior junction form a projection, which is conspicu- 

 ous just below the lunular area, but farther down disappears, seemingly in 

 consequence of* flattening over a small space through pressure, which gives 

 a somewhat truncate appearance to the front margin. The slight rim of the 

 lanceolate cardinal area has been removed upon the right side. The radi- 

 ating ribs, though considerably worn, are still plainly visible, but no trace of 

 concentric lines or wrinkles of growth can be distinguished. 



The cast most nearly resembles Ph. rostrcda Matheron, as described and 

 figured by Zittel (Die Bivalven der Gosaugebilde in den Nordiistlichen 

 Alpen, Denkschriften Kais. Akad., Math. Naturwissensch., XXIV, p. 115, 

 PL ii, figs. 2 a-c, 1865). It is, however, proportionally higher, is more 

 ventricose, and lacks the area posticalis profunda, anguh elevato circumscripta, 

 which is very marked in that species. But for the difference in this last 

 respect, I should regard the two as identical, as they indeed may prove to be 

 upon the accumulation of more material. 



Comparison with Conrad's type may show this to be his PA. decisa (Official 

 Report, p. 217, PI. vii, fig. 44), which was described and figured from a single 

 specimen found at Bhamdun, in the Beirut district. But I am unable to 

 make the two to be one and the same species on the evidence of Conrad's 

 figure and description. Coll. Merrill. 



Local/I// (an/ Position. — Beirut district ; from a highly ferruginous Turo- 

 nian deposit. 



Cytherea (Callista ?) Libanotica, sp. nov. 



Plate IV, figs. 3 a. 1>. c. 



Nucleus ovato-triangularis, incequilateralis, tumidior, antice breviter el late rotun- 

 datus, postice oblique productus, cuneifomiis, subaitenuatus : margo inferior convexus, 

 extremilatem poslcriorem versus fere rectus sen paululum insinuatus : margo lunularis 

 concavus, areaUs rectiuscuhs ; depressio lunularis profunda, ovato-ehngata, infra 

 ucula, marginata ; depressio arealis insignis, lanceolata, marginibus rotundatis termi- 

 uala : umbones antemediani, prominuU, incurvi: cicatrix muscularis aniica conspicua, 

 postica cerni nan potest. 



Cast ovate-triangular, inequilateral, rather swollen, shortly and widely 

 rounded before, behind obliquely produced, wedge-shaped, somewhal attenu- 

 ate: lower margin convex, but toward the posterior end almost straight or 

 very slightly sinuated : lunular margin concave, that of the area nearly 

 rectilinear: lunular depression deep, ovate-elongate, sharp below ; depression 



