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58 CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 



seems to be a true Callista, as indicated by shape and hinge markings. Size: 

 length 14 mm.; height 11 mm.; depth of two valves 6 mm. 



"Moderately abundant in the Cretaceous beds at Pt. Nova Cruz and Sao 

 Jos6, Prov. of Pernambuco, Brazil. Respectfully dedicated to Dr. McGrath of 

 Pernambuco, to whom Prof. Hartt and his party are indebted for many favors 

 and valuable information regarding the geology of the vicinity of Pernambuco." 



Remarks. — The specimens from Soldado Rock vary a good deal in size, from 

 about 14 mm. in length (the size of Rathbun's type) to 21 mm. The locality 

 was evidently very well adapted to the species which is quite common. 



Dr. White records this species also from the Rio Maria Farinha beds, State 

 of Pernambuco, and from Rio Piabas, State of Para. 



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



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

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



Callista mcgrathiana Rathbun var. rathbunensis new variety. Plate IX, Figure 11. 



Description. — Shell similar to a large specimen of Callista mcgrathiana; but 

 characterized by the sudden cessation of the concentric groovings over the lower, 

 central portion of the valve. Elsewhere the concentric sculpturing is beautifully 

 regular, then it abruptly becomes obsolete. 



Length of shell 21, height 15 mm. 



Locality.— Bed No. 2, Soldado Rock, near the Serpent's Mouth, Gulf of Paria. 



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

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



This variety is named in honor of Dr. Rathbun, of the United States National 

 Museum, who was the first to describe shells from the Rio Maria Farinha beds, 

 Brazil. 



Subfamily VENERINJE. 



Genus CHIONE von Muhlfeld, 1811. 

 Chione veatchiana new species. Plate IX, Figures 17, 18. 



Description.—- Shell moderately small for the genus, ovate-triangular, slightly 

 rostrated posteriorly; substance rather thin; hinge characters shown in the figure; 

 pallial sinus short, triangular; inner margin of valves finely and sharply crenate; 

 sculpture of close-set, feeble, very slightly raised lamellae, cancellated by slightly 

 more conspicuous, radiating striae. 



Length of shell 25, height 20, diameter 14 mm. 



Remarks.— This species is allied to Chione walli Guppy 32 from the Manzanilla 

 beds of Trinidad; but the outline of the latter shell is circular instead of elon- 

 gately-triangular, and the concentric sculpture tends to be stronger than the 

 radial, while in the species now described the opposite is true. 



The shell is dedicated to Mr. Arthur C. Veatch, by whom it was collected. 



Locality.— Along the shore 1000 feet west of the pier at Brighton, Trinidad, 

 in impure asphalt. 



" Quart. Jour. Geol. Soc, XXII, pi. XXVI, fig. 16, 1866. 



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