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68 CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 



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Geological horizon. — Upper Oligocene, about equivalent to the Chipola marls 

 of Florida. 



Genus CARICELLA Conrad. 

 Caricella ogilviana new species. Plate X, Figure 7. 



Description. — Shell of moderate size, thick and strong as shown where it is 

 fractured; whorls six, sloping evenly from a short, acute spire, last volution 

 not at a,ll shouldered, gently rounded; sutural line inconspicuous, surface of 

 shell entirely smooth, lines of growth very faint, seen only with a lens; plaits 

 of the columella concealed by the silicious matrix. 



Length of shell 25, greatest width 14, thickness 12 mm. 



Remarks. — This species is entirely unlike any known Caricella from the lower 

 Eocene horizons. Its general form, however, is considerably like Caricella 

 isabellce Maury from the Oligocene of Florida. One specimen only was found. 



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



Geological horizon. — Midway Eocene. Equivalent to the Midway of Ala- 

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



Named in honor of Dr. Ida H. Ogilvie, of Barnard College, Columbia Uni- 

 versity. 



Caricella perpinguis new species. Plate X, Figure 8. 



Description. — Shell medium sized; pyriform, solid and strong, as shown by 

 the thickness of the fractured lip; whorls six, sloping rather suddenly from a short, 

 very acute spire; last volution extremely convex and inflated; sutural line dis- 

 tinct, impressed; surface of shell entirely smooth, lines of growth visible only 

 with a lens; plaits of the columella concealed by the silicious matrix. 



Length of shell 29, greatest breadth 17, thickness 15 mm. 



Remarks. — Only a single shell was found also of this Caricella, which can 

 at once be distinguished from C. ogilviana by the decided difference in outline. 

 When placed side by side C. ogilviana is comparatively slenderly and gracefully 

 proportioned, while C. perpinguis as its name implies, is an exceedingly robust 

 shell. The number of whorls is the same in both shells, which precludes the 

 possibility of one being a younger form. 



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



Geological horizon. — Midway Eocene. 



Caricella sp. indet. Plate X, Figure 9. 



Among the collection of fossils from Soldado is a portion of the spire of a 

 shell which belongs in or near the genus Caricella. This is indicated by the 

 peculiarity of its sculpture. All the whorls exposed are perfectly smooth, 

 except that at the top of the spire which show very distinct traces of fine, very 

 oblique, longitudinal riblets. 



This character, as Dr. Dall has shown in his review of the Volutidce* 1 is typical 

 of the Caricella group of the Voluta family. 



41 Trans. Wagner Inst. Science, vol. Ill, pp. 57-91. 



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