CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 99 



Remarks. — This simply but handsomely sculptured shell bears a considerable 

 resemblance to flatter specimens of Heilprin's S. cupolum from the Lignitic of 

 Alabama. But although the general type of sculpture is not unlike, the base 

 and periphery of the Alabama shell is wholly different, the periphery having a 

 sharp, overhanging keel while that of the Soldado shell is evenly and gently 

 rounded. The other Solariums which resemble S. stephanephorum in shape have 

 the beaded type of sculpture which shows a specific difference. 



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



Geological horizon. — Lignitic Eocene. 



Genus AMPULLARIA Lamarck, 1799. 

 Ampullaria luteostoma Swainson. Plate XIII, Figure 3. 



Several broken shells of this species were found in the Barranca near Guanoco, 

 Venezuela. These match exactly shells of the same species now living in the 

 water near by, and our drawing shows the broken fossil shell (shaded) supple- 

 mented by a recent one (dotted line) of the same size. 



Ampullaria luteostoma is very common in the streams and ditches in Vene- 

 zuela. It shows great variation in color designs; some shells being a uniform 

 yellowish-green, while others are variously banded with chocolate or reddish 

 brown. 



Locality. — The Barranca, along the Guanoco-Felicidad railway, Venezuela. 



Geological horizon. — Pleistocene. A raised beach formation. 



Ampullaria (Ceratodes) cornuarietis Linn. Plate XIII, Figure 4. 



Remarks. — Like all the Ampullarian shells belonging to the section Ceratodes 

 Guilding (Marisa Gray) this species is discoidal in form, resembling superficially 

 Planorbis. 



Ceratodes cornuarietis lives in Brazil, and is exceedingly common in Venezuela 

 where it is much prized by the Guarauno Indians as an article of food. 

 The writer has seen it in hundreds in the brackish water streams and ditches 

 along the Guanoco-Felicidad railway. It varies greatly in its decoration of 

 bands, — some shells being of a uniform amber color, while others are handsomely 

 variegated with bands of reddish brown of various widths and patterns. 



A few broken specimens of this species were found in the shell bank near 

 Guanoco above the ditch in which the recent shells are living. 



The fossil and recent forms are exactly alike, and the figure shows the fossil 

 fragmentary shell (shaded) supplemented by a recent one of the same size (lined 

 only). 



Locality. — The Barranca, along the Guanoco-Felicidad railway, Venezuela. 



Geological horizon. — The fossils are found in a raised beach of Quaternary age. 



Genus CALYPTRdSA Lamarck, 1799. 

 Calyptraea aperta Solander. Plate XIII, Figure 5. 



Trochus apertus Solander, Foss. Hant. p. 9, figs. 1, 2, 1766. 

 Calyptraea trochiformis Lamarck, Ann. du Mus., vol. 1, p. 385, 1802. 



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