370 TRANSACTIONS OF THE WAGNER FREE 



Turritella tampse var. pagodaeformis Heilprin. 

 Plate 17, figure 9. 

 T. pagodceformis Heilp., Trans. Wagn. Inst. i. p. 112, pi. 8, fig. 52, 1887. 



Older Miocene of the Orthaulax bed, Ballast Point, Tampa Bay, Florida, 

 Willcox, Shepard and Burns. 



This form appears, from more abundant and perfect material than that at 

 Prof Heilprin's disposal, to be essentially similar to the form which he 

 described as T. tampcB, which is more abundant and seems to be the normal 

 form of the species. In the present variety the whorls usually, but not 

 always, overhang a little, they do not become discontinuous, while the pri- 

 maries of the spiral sculpture are more pronounced than in the type. 



There is still another form of the species which is more slender and has 

 the constriction very pronounced, the carina much emphasized, especially the 

 two near the base ; and another in which the basal carina is prominent while 

 the others are'faint and the whorls nearly flat-sided ; but it seems hardly worth 

 while to apply names to such mutations at present. Each species of Tiirritella 

 belonging to one general type runs through a very similar series of sculptural 

 mutations ; some types have many, others few, mutations ; yet, in spite of all 

 the variations, with a good series of perfect specimens the species can usually 

 be recognized. 



Turritella gatunensis Conrad. 

 Plate 17, figure 10. 



Turritella gatunensis, Conr., Pacific R. R. Reports, vi. part 2, p. 72, P'- v. fig. 20, J857 ; Gabb, 

 Journ. Acad. Nat. Sci. Phila., 2d Ser. viii. p. 342, pi. 44, fig. 10, 1S74. 



Vicksburg Eocene at Martin Station, Florida, Dall and Willcox ; Miocene 

 of the Isthmus of Darien, on the Panama R. R. at Gatun, and Vamos-vamos, 

 on the line of the canal, fourteen miles west of Colon, a few feet above the sea- 

 level, Conrad and Agassiz ; older Miocene of the Orthaulax bed at Ballast 

 Point, Tampa, Florida, Dall and Willcox; Miocene of Costa Rica, near Pico 

 Blanco, in Talamanca, Costa Rica, Gabb. 



The identification of this species would hardly have been ventured upon 

 if it had not been possible to compare with Panamic specimens. The Turri- 

 tella uvasaiia of Conrad, from the figures extant, must be an extremely simi- 

 lar species, and perhaps identical with T. gatunensis. T. arenicola Conrad 

 (Am. Journ. Conch, i. p. 141, pi. lO, fig. 1 1, 1865) seems also to be nearly re- 

 lated. It is from the Jackson Eocene. 



Turritella megalobasis n. s. 

 Plate 17, figure 11. 

 Older Miocene of the Orthaulax bed at Ballast Point, Tampa Bay, 

 Florida, Dall. 



Shell large, broad at the base, conical, with rather faint sculpture and 



