CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 97 



Height of fragment 12, greatest diameter 6 mm. 



Remarks. — This species is allied to T. clevelandia Harris 80 from the upper 

 Eocene (Jackson) of Arkansas, which is also ornamented by " three prominent 

 revolving lines and a few subordinate ones," but each volution slopes abruptly 

 both above and below to the suture; making a deep furrow at the sutural lines, 

 which is not the case in the Soldado shell. 



Another allied species apparently more closely related is T. soaresana (Hartt) 

 White 81 from the Rio Maria Farinha beds of the State of Pernambuco, Brazil. 

 This has the same type of ornamentation, but is also more excavated at the 

 sutures, and was an apparently larger shell than T. soldadensis. 



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



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

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



Mesalia pumila Gabb. 



Genus MESALIA Gray, 1842. 



Turritella pumila Gabb, Jour. Acad. Nat. Sci. Phila., vol. IV, p. 392, pi. 68, fig. 14, 1860. 

 Mesalia pumila Harris, Bull. Am. Pal., I, p. 226, pi. 11, fig. 15, 1896. 



GaWs original description. — "Turrited, whorls? (spire is broken) rounded 

 and strongly striate; mouth round; shell very thick; surface marked by three 

 heavy revolving lines on the convexity of the whorl, and one at the base just 

 above the suture, which is small but distinct. 



" Dimensions. — Length of fragment .5 in., width of body whorl .3 in., diam- 

 eter of mouth .1 in." 



Type locality, Middleton, Tennessee. 



Remarks. — During the Lower Eocene period this species developed many 

 varieties. Two of these are in the Soldado Rock, Midway, fauna. 



Mesalia pumila var. allentonensis Aldrich. Plate XII, Figure 27. 



Turritella allentonensis Aldrich, Geol. Surv. Alabama, p. 246, pi. 13, figs. 4a, 6, 1894. 

 Mesalia pumila var. allentonensis Harris, Bull. Am. Pal., I, p. 227, pi. 11, figs. 20, 21, 1896. 



Description. — In the Paleontological Museum of Cornell University there 

 are several specimens of this variety from the Midway Eocene near Palmer's 

 Mill, Alabama, which are very close to one of the Soldado shells. The latter 

 has four or five instead of the typical three heavy revolving lines, and is more 

 deeply channeled at the suture than is the type. 



Height 34, greatest width 14 mm. 



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



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

 bama and of the Rio Maria Farinha beds of Brazil. 



Mesalia pumila var. nettoana White. Plate XII, Figure 28. 



Mesalia nettoana White, Arch, do Museu Nac. do Rio de Janeiro, vol. VII, pp. 164-165, pi. 

 XVIII, figs. 3, 4, 1887. 



80 Rept. Geol. Surv. Arkansas, vol. 2, p. 170, pi. 6, fig. 9, 1894. 



81 Arch, do Museu Nac. do Rio de Janeiro, vol. VII, pp. 160-161, pi. XVIII, figs. 8, 9, 1887. 



7 JOURN. ACAD. NAT. SCI. PHILA.. VOL. XV. 



