66 CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 



Genus TEREBRA Adanson, 1757. 

 Terebra sp. indet. Plate X, Figure 2. 



Remarks.— The impression of a fragment of what appears to have been a shell 

 of Terebra was found in the ferruginous marls at Brighton . 



The drawing is from a gutta-percha mould taken from the original. 



The sculpture suggests such forms as varieties of T. dislocata Say and of T. 



bipartita Sowerby. 



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



in a yellowish-brown, ferruginous layer. 



Geological horizon. — Upper Oligocene. 



Genus PLEUROTOMA Lamarck, 1799. 



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Pleurotoma guppyana new species. Plate X, Figure 3. 



Description. — Shell small, fusiform, when complete, number of whorls known 

 six; whorls ornamented by (1) a nearly central row of small, equidistant, rec- 

 tangular nodules ; (2) spiral threads revolving over the volutions on either side of 

 the row of nodules, being most marked on the basal side ; (3) a slightly elevated, 

 subsutural ridge; (4) transverse lines of growth which swing far back at the 

 nodular rows, making angular curves and forming an oblique cancellation with 

 the spiral threads. 



Length of fragment 9 , greatest width 5 mm . 



Remarks. — The close relationship of this shell to the group of Pleurotoma 

 denticula (Basterot) Edwards is at once apparent. It is very near to specimens 

 from the Lignitic of Alabama described as PL denticula var. by Professor Harris, 37 

 from which it differs some in outline and in the presence of the subsutural ridge; 

 but the type of sculpture is very like that of the Alabama shells . 



Pleurotoma denticula was originally described from the southwest of France 

 by Basterot. 38 Later, in 1860, Edwards referred a number of varying forms 

 found in the Barton beds of southern England to varieties of this species, and 

 Professor Harris has found certain varietal forms from England grade into those 

 in the Alabama Lignitic. It is now of interest to find a type closely allied to 

 the Alabama forms so far south as approximately 10° N. Lat. 



The writer takes great pleasure in dedicating this species to Dr. R. J. Lech- 

 mere Guppy, of Port of Spain, Trinidad, whose unremitting interest, enthusiasm 

 and careful study has done so much to further the world's knowledge of the 

 paleontology of the Antilles. 



Locality.— Bed No. 6, Soldado Rock, Gulf of Paria, near the Serpent's Mouth. 

 Geological horizon .—Lignitic Eocene. 



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