54 CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 



Locality. — Southern main road just south of Pitch Lake, Brighton, Trinidad 

 in a yellowish-brown , ferruginous marl . 



Geological horizon. — Oligocene, probably a rather late stage of that period. 



Genus CRASSATELLITES Kruger, 1823. 

 Crassatellites sp. indet. Plate IX, Figure 4. 



In the black shales near Coycuar, Venezuela, are a number of very small 

 shells with the marked umbonal-basal carination, and strong concentric groovings 

 characteristic of the young of Crassatellites. 



They are therefore tentatively referred to this genus. 



Locality.— On the trail from Parare to Coycuar, about six miles south of 

 Parare and three south of Caituco, Venezuela. 



Geological horizon. — Basal Upper Cretaceous? 



CARDIUM Linnaeus 



Cardium 



Plate IX, Figures 5, 6. 



Description.— Shell small, convex, triangularly cordate, anterior margin 

 sloping in a rounded curve to the basal margin, posterior margin truncated; 

 shell divided, by a prominent carina extending from the beak to the posterior 

 end, into a body area and a truncated posterior area; ribs on the body nine, 

 rather sharp-edged, ornamented by bead-like nodules which on the four ribs 

 towards the carina are on the carina side of each rib, on the remaining five ribs 

 the beads are nearly central; ribs on the truncated area eight, more crowded, 

 less elevated, squamose rather than beaded; interspaces on the body much 

 narrower than the ribs, except the space beside the carinal rib, which is wider 

 than the others, and is beautifully and conspicuously marked by the cross stria 

 of lines of growth which also cross the other interspaces, but there are hardly 

 seen except with a lens. 



Height of shell 11, greatest width 7, diameter 8 mm 



Remarks.-Thit 5 exquisite little shell is closely allied to Dr. Guppy's Cardium 



ZnTJT the ^ k anZaniUa bGds " but that s P<*ies has twenty-two stout 



Z L?X ^ P .? teri ° r Sl0pe near the be *k is different. In general 



MaTurt VUTa Te T b ^ nCe t0 Car<Uum mature ™ D«n ^om the Pliocene of 



^^T^ff * S amiW DaU from Santo Domin g° 01i g° cene beds - 



L%Z T A? T te t t0 MrS ' ^^ a Veatch > °i Washington, D. C. 

 ^■Sf^ Sh ° re ° ne th ~ d ^et west of the pie" at Brighton, 



Geological horizon.-Vpper Oligocene about Chipolan. 



Protocardia co 



Descript 



PROTOCARDIA 



Plate IX, Figure 7. 



posterior surface ^S^S^T' *"F e <* uilat ^ subcircular in outline; 

 • Quart t n T^T * fteen radiatin S ribs J anterior sculptured only 



Quart. W Geol. See. London, vol. XXII, p. 582, pi. XXVI. «.. 4. iJ 



