CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 41 



Genus PLICATULA Lamarck, 1801. 

 Plicatula torta Gabb? Plate VII, Figure 3. 



Cf. Plicatula torta Gabb, Cretaceous of Peru, Jour. Acad. Nat. Sci. Phila., vol. VIII, p 295 nl 40 

 fig. 5, 1877. ' F ' ' 



Mr. Artie Reeds collected a single specimen of an interesting shell which is 

 doubtfully referred by Dr. Stanton to Plicatula torta, described by Dr. Gabb 

 from the Cretaceous of Peru. The shell is unfortunately too fragmentary for 

 any positive identification. 



Height of the shell 27 mm. 



Locality. — Headwaters of the Rio Grande, one mile north of where the river 

 crosses the trail to Guariqueen, Eastern Venezuela. 



Geological horizon. — Cretaceous. 



Genus SPONDYLUS Linnams, 1758. 

 Spondylus sp. indet. Plate VII, Figure 4. 



Among the shells from Soldado is a fragment of a Spondylus too imperfect 

 and fragmentary to describe. 



On comparing it with the specimens of S. bostrychites Guppy var. chipolanu$ 

 Dall, from the Oligocene of Florida, which it resembles somewhat in type of 

 sculpture, it is found to differ in having the fine radiating ribs always paired or 

 furrowed down the center so as to appear double. 



The genus Spondylus is rare in both the Tertiary and recent faunas, 

 is the first ever found in the Midway or Lignitic. 



Locality. — Bed No. 8, Soldado Rock. 



Geological horizon. — Lignitic Eocene. 



Genus PERN A Bruguiere, 1792. 

 Perna obliqua Lamarck. Plate VII, Figure 6. 



The characteristic manner in which these shells burrow in the rocks of the 

 Gulf of Paria is shown by the illustration. 



Locality. — Black Rock, near Soldado, Gulf of Paria. 

 Geological horizon. — Recent. 



Genus INOCERAMUS J. Sowerby, 1819. 



Inoceramus labiatus 



Figu 



us labiatus Schlotheim 



Inoceramus mytiloides Mantell, Geol. of Sussex, p. 215, pi 28, fig. 2, 1822. 

 Inoceramus ariculoides Meek and Hayden, Proc. Acad. Nat. Sci.. Phila., p. 181, 1860. 

 Inoceramus plicatus (d'Orbigny ) Karsten, Geologie de 1'ancienne Colombie Bolivarienne, Venezuela, 



Nouvelle-Grenada et Ecuador, p. 18, 1886. 

 Inoceramus labiatus Stanton, Bull. U. S. Geol. Surv. No. 106, pp. 77-78, pi. X, fig. 4, pi. XIV, 



fig. 2, 1893. 



Meek' s description. — "Shell obliquely elongate-oval, subelliptical or ovate, 

 nearly or quite equivalve, rather compressed, thin and fragile; anterior side 

 forming a slightly convex curve from the beaks obliquely downward and back- 



