54 SYEIAN MOLLUSCAN FOSSILS. 



Hippurites plicatus Conrad. 



Plate III, fig. 8. 



Hippurites plicatus Conkad, 1S52, Official Report, p. 234, App., PI. vii, fig. 49. 



Two specimens, apparently of this species. Tiie one figured is a free 

 lower valve : height, 68 mm. ; greatest width, 45 mm. The other is a 

 cluster of aggregated individuals, upon one of the imperfect shells of which 

 a single upper valve is present. This is in place, and, so far as it is distin- 

 guishable in the mass, has the general form and about one fourth the height 

 of the figured lower valve, with its apex central and directed upwards. 

 Coll. Merrill. 



Localiti/ and Position. — Beirut disti'ict ; probably from the same horizon 

 as the species next following. 



Hippurites Lewisii Fr.\as. 



Hippuriles Lewisii Fra.ys, 1878, Aus dem Oricut, II. Tlicil, p. 71, PI. v, figs. 5 a, b. 



A single lower valve, entire and answering fairly to Fraas's description 

 and figures. Height, 65 mm. ; greatest widtli, 60 mm. Whether this and 

 plicatus are distinct species may perhaps be doubted. Coll. Thomson. 



Locality and Position. — Probably the Beirut district; assigned by Fraas to 

 the Cardium bed of the Turonian (see pp. 6, 7). 



Trigonia Syriaca Conrad. 



Trigonia Syriaca Conkad, 1853, Official Report, pp. 214 and 232, PI. iii, figs. 19, 20, 21, 23, and App., 



PI. iv, fig. 26. 

 Trigonia Si/riaca Fraas, 1878, Aus dem Orient, II. Tiicil, p. 43, PI. iii, figs. 2-5. 



Seven specimens. Three with both valves nearly entire; one single right 

 valve ; three casts. Fraas's figm-es of the exterior of this species are far 

 better than Conrad's. 



The best shells and casts — two of each — are from a private collection of 

 Professor Louis Agassiz, and are labelled only " Lebanon." The others are 

 from the Merrill collection. 



Locality and Position. — Probably from the Beirut district. Fraas styles 

 this the " leading fossil " of the Cenomanian Sandstone. 



