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104 CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 



Remarks. — A single Dentalium shell was found at Soldado. On comparing 

 this with a large number of D. microstria from the Lignitic of Alabama, it is 

 found to resemble them very closely, the only apparent difference being that the 

 microscopic striae on the Soldado shell are slightly more pronounced and a trifle 

 more close-set than those on the Alabama shells. They appear to be the same 

 species, although the Soldado shell should perhaps be classed as a variety. 



Locality. — Bed No. 8, Soldado Rock, Gulf of Paria. 



Geological horizon. — Lignitic Eocene. 



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Class CEPHALOPODA. 

 Genus AMMONITES (Breyn, 1732) Lamarck, 1801. 

 Ammonites cf. mosquerae Karsten. Plate XIII, Figure 16. 



Remarks. — Associated with Inoceramus plicatus (Orb.) Karsten (which is 

 apparently identical with Inoceramus labiatus Schlotheim) in the dark, cherty, 

 hard layers of the Cretaceous limestones near Guanoco, Venezuela, are a number 

 of small, worn Ammonites. 



Dr. Stanton, of the United States Geological Survey, well-known as the 

 leading American Cretaceous paleontologist, kindly examined a number of the 

 latter and compared them in general form and sculpture with Karsten's Am- 

 monites mosquerce and A. barbacoensis. Dr. Stanton remarked in his letter, 

 " Unfortunately, your specimens do not show either the sutures or the character 

 of the ventral margin, and it is therefore impossible to assign them to their proper 

 genera. Their form and sculpture — so far as it is preserved in these specimens — 

 are practically duplicated in the genera Schlcenbachia, Prionotropis, etc., which 

 are common in the lower part of the Upper Cretaceous and are represented by 

 similar types as low as the Gault." 



On comparing the specimen figured with Karsten's A. mosquerce* 1 the general 

 type of ornamentation is seen to be the same. It is very likely this species, for 

 both A. mosquerce and barbacoensis were found by Karsten with Inoceramus 

 plicatus in the Barbacoas limestone. 



Locality.— Ravine on the right hand side of the trail going from Guanoco to 

 Hurupu, Venezuela, just above Rio Colorado. Latitude approximately 10° 8' 

 North; longitude approximately 3° 59' 6" East of Caracas. 



Geological horizon.— Upper Cretaceous, probably equivalent to the European 

 Turonian, or the Benton of the western United States,— certainly not lower 

 than the Gault (Stanton). 



Class BRACHIOPODA. 

 Genus TEREBRATULA (Llhwyd, 1699) Klein, 1753. 

 Terebratula stantoni new species. Plate XIII, Figures 17, 18. 



Description.— Shell of moderate size, oblong, substance thin and fragile; 

 beak slightly incurved, terminated by a large, circular foramen; surface orna- 

 87 G6ol. de Pancienne Colombia Bolivarienne, pi. IV, figs. 4a, 4b, 1886. 



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