

M ■) 



92 CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 



Ill 



Iisi 



P 



ES 





5NI 



5NI 







1 hri 



Cerithium tinkeri new species. Plate XII, Figure 17. 



Description. — Shell, judging from the gutta-percha cast made from its im- 

 pression, rather broad, solid and strong, number of whorls known seven; longi- 

 tudinal sculpture of numerous narrow riblets which are interrupted by four or 

 five impressed spiral lines, the one immediately below the suture constituting a 

 narrow groove. 



Height approximately 25 mm. 



This species is named in honor of Dr. Tinker, of Cornell University. 



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

 in a ferruginous marl. 



Geological horizon. — Upper Oligocene. 



Genus CERITHIOPSIS Forbes and Hanley, 1849. 

 Cerithiopsis veatchiana new species. Plate XII, Figure 21. 



Description. — Shell small and slender, tapering to a high, acute spire; whorls 

 fourteen, of which the three nuclear are smooth, the fourth from the apex orna- 

 mented only with revolving striae; subsequent volutions with (a) four or five 

 rather strong spiral threads; and (6) numerous narrow, oblique longitudinal 

 plications (about twenty on the last volution) ; these at their intersections with 

 the spiral threads become slightly nodular; columella showing two rather faint 

 plications. 



Height of shell 8, greatest width 3 mm. 



Remarks. — This very delicate little shell is unlike any described from the 

 Lower Eocene. 



It is dedicated to Mr. Arthur C. Veatch, of Washington, D. C, by whom it 

 was found. 



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



Geological horizon. — Lignitic Eocene. 



Genus TURRITELLA Lamarck, 1799. 

 Turritella humerosa Conrad. 



T. humerosa Conrad, Trans. Geol. Soc. Penn., vol. 1, p. 340, pi. 13, fig. 3, 1835. 



T. humerosa H. C. Lea, Proc. Acad. Nat. Sci. Phila., vol. IV, p. 107, 1848. 



T. humerosa Conrad, Amer. Jour. Conch., vol. I, p. 32, 1865. 



T. eurynome Whitf., Amer. Jour. Conch., vol. I, p. 266, 1865. 



T. multilira Whitf., ibid., p. 266. 



T. bellifera Aid., Geol. Surv. Ala., Bull. No. 1, p. 34, pi. 1, fig. 13, 1886. 



Turritella elicita White, Arch, do Museu Nac. do Rio de Janeiro, VII, pp. 162-163, pi. XVIII, 



figs. 6, 7, 1887. Not of Stoliczka. 

 T. cathedralis var. bellifera De Greg., Mon. Faun. Eoc. Ala., p. 127, pi. 11, figs. 17, 18, 1890. 

 T. humerosa Harris, Amer. Jour. Sci., ser. Ill, vol. XLVII, p. 303, 1894. 

 T. humerosa Clark, Bull. 141, U. S. Geol. Surv., p. 70, pi. XIV, fig. 1, 1896. 

 T. humerosa Harris, Bull. Amer. Pal., vol. I, pp. 110-111, pi. 11, fig. 11 (typical), 1896; Bull. 



Amer. Pal., vol. Ill, p. 75, pi. 10, figs. 5, 6, 7, 1899; Geol. Surv. La., p. 308, pi. 55, fig. 5, 1899. 

 T. humerosa Clark, W. B., Eocene, Md. Geol. Surv., pp. 148-149, pi. XXVII, figs. 1, la, 1901. 

 T. elicita Arnold in Branner, Bull. Mus. Comp. Zoology, Harvard College, vol. XLIV, 1904. 



Conrad's original description— " Shell turrited, subulate; whorls with fine 

 regular revolving strise; an obtuse slight elevation on the summit, a shallow 

 groove at the base of each. 



■i 



a 



> 



m 



CO 



CO 



X 



J o 



- 

 > 



2 



BBS 



