HH 



mm 





hi y ni.u 1 1 ilu i 



CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 49 



the genus a little doubtful. The posterior end of the hinge seems to be marked 

 with the longitudinal teeth peculiar to Cucullcea, while in the interior moulds 

 there is a slight, rounded depression bordering the posterior muscular imprint 

 below, and extending some distance toward the beak. As to shape the form is 

 truly Cucullean. Size of a medium specimen: length 27 mm.; height 18 mm.; 

 depth of both valves 16 mm. 



"Very abundant, as interior moulds, in the whitish limestone of the Cretaceous 

 at Maria Farinha, Province of Pernambuco, Brazil. Dedicated to my teacher 

 and friend, Prof. Ch. Fred. Hartt." 



Remarks. — Cucullcea harttii is by far the commonest shell of the Soldado 

 Rock, Bed No. 2, fauna. Together with Calyptraphorus, Venericardia, Turritella 

 and other less common forms, it makes up a very indurated shell breccia. All 

 sizes of the species occur from very small, young shells, up to the large adult 

 forms like the one figured, which measured 29 mm. in length, 19 in height and 

 20 in diameter. 



This species has never before been found except at the type locality, near the 

 mouth of the Rio Maria Farinha in the State of Pernambuco, Brazil. The type 

 shells were collected in 1870 by Messrs. 0. A. Derby and D. B. Wilmot under the 

 direction of Professor Hartt, and were submitted to Dr. Rathbun for study. As 

 Dr. Rathbun did not figure the species and Dr. White's figures were of imperfect 

 specimens, it has been thought best to figure one of the very fine shells from 

 Soldado. 



Locality.— Bed. No. 2, Soldado Rock, Gulf of Paria, near the S.W. point of 

 Trinidad. 



Geological horizon. — Midway Eocene. Equivalent to the Midway of Alabama 

 and of Rio Maria Farinha, State of Pernambuco, Brazil. 



Genus GLYCYMERIS Da Costa. 

 Glycymeris (Axinea) viamediae new species. Plate VIII, Figure 13. 



Description. — Shell small, ovate-orbicular, thin, slightly convex; beaks low, 

 inconspicuous, pointed, approximate; teeth concealed in all the specimens by 

 the silicious matrix; concentric sculpture of several lightly impressed crenulate 

 lines of growth, irregularly disposed, marking resting stages; radial sculpture of 

 very delicate, narrow, flattened riblets alternating with microscopic, radial 

 threads. 



Height of shell 16, length 17, diameter 8 mm. 



Remarks. — This very pretty and delicate shell is the first of the genus ever 

 found in the Midway or earliest Eocene. 



It was rather a common shell in the Soldado fauna, as we have a number of 

 specimens. The one figured, although showing the sculpture best, has a more 

 sloping hinge line than the majority of the shells. 



Locality.— Red No. 2, Soldado Rock, Gulf of Paria. 



Geological horizon. — Midway Eocene. Equivalent to that of the Midway 

 of Alabama and of the Rio Maria Farinha beds, State of Pernambuco, Brazil. 



4 JOURN. ACAD. NAT. SCI. PHILA., VOL. XV. 



1 



