CAEDIUM CEEBRIECHINATUM. 49 



mcnt in outline between the easts and his figure, taking the side view, that 

 the propriety of referring the fossils to the species named above is manifest. 

 But the figure must have been drawn from a cast on which the ridge caused 

 by the filling of the posterior gape of the valves had been worn away. This, 

 as seen in our figure, presents at the margin a straight line running obliquely 

 downward from the obtuse angle which it forms with the hinge line. The 

 posterior view shows curved grooves proceeding from the beaks downward 

 and inward to the mesial X'idge. These are imprints left by internal umbonal 

 ridges, such as occur in the recent C. consors Sow., C. isocardia, Linn., and other 

 species of the subgenus Acanlhorardia, which ridges stamp upon plaster casts 

 of their interiors like grooves, but less deeply impressed. The species just 

 named, however, have no defined lunule, but their internal casts show be- 

 neath the beaks, in front, a widely cordate impression, left by the large 

 anterior lateral teeth. The corresponding cavity in the Lebanon casts is 

 due to a like cause, and outside of it is seen the border of a "lunule large 

 and cordate," but very feebly impressed. Two of the casts clearly show the 

 presence of thick-set, narrow radiating ribs. Coll. Thomson and Merrill. 



Localil// and Position. — Beirut district ; probably from the zone of the 

 Cardium bed. 



Cardiurn crebriechinatum Conrad, 



Cardium crebriechinatum Conrad, 1852, Official Report, pp. 217 and 231, PI. vi, figs. 41-43, PI. xv, fig. 77, 



and App., PI. ii, fig. 1(3. 



Two specimens, one with test, and nearly entire; the other an imperfect 

 cast. 



Fraas doubts the classification of this species as a Cardium, and is inclined 

 to consider it to be a Cardita, — on what ground is not evident. Lartet 

 thinks it may be identical with C. sulciferum Coquand (Geol. et Paleont. do 

 Constantine, p. 206, PL x, figs. 15, 10). The forms of the two species are 

 indeed very similar, and both are covered with radiating ribs; hut upon 

 sulciferum (which is much the larger of the two) the ribs are wide, while 

 upon crebriecMnatum they are much more numerous and very narrow. Coll. 

 Thomson. 



locality and Position. — Found at Abejh bv Fraas, and by him referred to 

 the Gasteropod zone of that vicinity. 



7 



