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78 CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 



Genus FUSOFICULA Sacco. 



Fusoficula juvenis Whitfield. Plate XI, Figures 2, 3. 



, Pyrula juvenis Whitfield, Am. Jour. Conch., vol. I, p. 259, 1865. 

 Pyrula multangular Heilprin, Proc. Acad. Nat. Sci. Phila., p. 374, pi. 20, fig. 2, 1886. 

 Pyrula juvenis Aldrich, Geol. Surv. Alabama, p. 25, pi. 6, fig. 8, 1886. 

 Pyrula juvenis Harris, Bull. Am. Pal., vol. I, pp. 216-217, pi. 10, figs. 5, 6, 1896. 

 Fusoficula juvenis Harris, Bull. Am. Pal., vol. Ill, pp. 66-67, pi. 8, figs. 15, 16, 1899. 

 Fusoficula juvenis Clark and Martin, Eocene, Maryland Geol. Surv., p. 143, pi. XXIV, figs. 4, 

 4a, 1901. 



Whitfield's original description.— 'Shell small and fragile; spire elevated; 

 columella slender, slightly bent; aperture large, elongate, ovate or subelliptical; 

 volutions three, marked on the periphery by three distinct carinse or subangular 

 revolving ridges, the upper one marked with closely arranged longitudinally 

 elongated nodes, the others simple; entire surface marked by very fine revolving 

 lines, which are somewhat fasciculate below the lower carina, there being three 

 finer ones between each larger one." 



Type locality, six miles above Claiborne, Alabama. 



Remarks. — This is a remarkably protean species, varying from three to four 

 or with even traces of a fifth carina, and from simple carinate to crenulate forms. 



The Soldado shells show no crenulations; in one there are three strong 

 carinse, in another three nearly obsolete carinse, in still another the carinse are 

 entirely absent, the shell sloping up gently and evenly to the base of the spire. 

 The lines of growth are prominent on all the Soldado shells, equalling in strength 

 the spiral striae, with which they form a beautiful cancellation over the entire 

 surface. 



Height of largest specimen 19, greatest width 7 mm. 



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



Geological horizon. — Lignitic Eocene. 



Genus STREPSIDURA Swainson, 1840. 

 Strepsidura ? soldadensis new species. Plate XI, Figure 4. 



Description. — Shell solid, pyriform, spire rather short, diminishing rather 

 abruptly in diameter above the last volution; whorls about five, all ornamented 

 with longitudinal costse (about eight on the penultimate whorl) which, on the 

 shoulder of the last volution, were angulatedor perhaps slightly spinous; surface 

 of the exterior of the shell covered with revolving spiral threads, fine and close 

 set on the earlier whorls, but becoming more distant and prominent on the body 

 whorl. 



Height of fragment 24, greatest width 20 mm. 



Remarks. — This shell is referred to Strepsidura largely because of the general 

 resemblance it bears to Strepsidura ? mediavia Harris 51 from Alabama. It is a 

 much larger and heavier shell, but is closer to that species than any that has 

 been described. 



Unfortunately, the single shell from Soldado is so fragmentary that all the 



61 Bull. Am. Pal., Vol. I, pp. 205-206, pi. 8, figs. 16, a, 17, 1896. 



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