CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 101 



Chipola, Florida, and of Costa Rica; it extends through the Miocene, Pliocene, 

 and Pleistocene of the United States, and is now living on the coasts of North 

 and South America from Cape Hatteras almost to the Straits of Magellan. 



Dr. Guppy reports this species (as Trochita candeana d'Orb.) from the Pliocene 

 and recent faunas of Trinidad. 



The presence of this shell in the Brighton marl suggests a horizon not earlier 

 than late Oligocene, as it is not known to have existed earlier than the Chipolan 

 of Florida. 



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

 in a yellowish-brown ferruginous marl. 



Geological horizon. — Upper Oligocene. 



Genus NATICA Adanson, 1757. 

 Natica eminulopsis new species. Plate XIII, Figure 7. 



Description.— Shell resembling smaller specimens of N. eminula Conrad, 

 especially the variety found in the Lignitic Eocene of Wood's Bluff, Alabama, 82 

 but with a higher spire and more elongated body whorl; volutions four; perfora- 

 tion not covered by callus, characters of the aperture concealed by the indurated 

 matrix. 



Height of shell 12, greatest width 9 mm. 



Remarks. — The writer is in some doubt whether this should be regarded as a 

 variety of eminula rather than as a separate species. But as typical eminula 

 is Claibornian Eocene, it seemed best to regard the Midway form as of the same 

 group and a precursor of eminula but a distinct species. 



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



Geological horizon. — Midway Eocene. 



Natica ef. semilunata Lea var. Plate XIII, Figure 8. 



A shell of a Natica was found in the Soldado Lignitic fauna, which compares 

 well with small specimens of a varietal form of N. semilunata from the Lignitic 

 of Wood's Bluff, Alabama. 83 



The aperture of the Soldado shell is, however, concealed, and renders a definite 

 comparison impossible. Yet it is very probable that the Soldado form is a 

 variety of Lea's shell or else a closely related species. 



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



Geological horizon. — Lignitic Eocene. 



Genus AMAUROPSIS Morch, 1857. 

 Amauropsis caloramans new species. Plate XIII, Figure 9. 



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

 shown where the shell is fractured; surface entirely smooth except for delicate 



82 See Harris, Bull. Am. Pal, vol. Ill, p. 88, pi. 11, fig. 22, 1899. 



83 See Bull. Am. Pal., vol. I, p. 86, pi. II, figs. 18-20, 1896. 



f'l 



