98 BULLETIN 90, UNITED STATES NATIONAL MUSEUM, 



TURRITELLA (TAMPAE var.?) MEDIOCONSTRICA, new species. 



Plate 13, fig. 3. 



Shell slender, acute, with age showing a tendency to loose coiling 

 of the whorls, which are then constricted in the middle; number of 

 the whorls in the figured specimen 16, the nucleus lost, the subse- 

 quent whorls rounding to the suture, with two low spiral keels, each 

 about one-fourth of the axial width of the whorl, from the most 

 adjacent suture; betAveen these the whorl is excavated and shows at 

 first one (the number gradually increasing to five on the last whorl) 

 small rounded closely adjacent spiral threads, separated only by a 

 narrower groove; aperture with a wide rounded excavation of the 

 outer lip, the deepest part of which is slightly above the middle of 

 the whorl; the basal portion of the lip is also moderately excavated, 

 and between the two the portion at the anterior keel of the whorl 

 projects most prominently, though distally rounded off. Length of 

 shell 59, axial length of last whorl 11, maxinuun diameter 15 mm. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida, E. J. 

 Post. U. S. Nat. Mus. No. 165122. 



TURRITELLA TAMPAE var. PAGODAEFORMIS Heilprin. 

 Plate 14, fig. 8. 



Turritella pagodaeformis Heilpein, Trans. Wagner Inst., vol. 1, p. 112, pi. 



8, fig. 52, 1887. 

 Turritella tampae var. pagodaeformis Dall, Trans. Wagner Inst., vol. 3, 



pt. 2, p. 310, pi. 17, fig. 9, 1892. 



Tampa silex beds, Heilprin, Willcox, Dall, and Burns. U. S. 

 Nat. Mus. No. 112595. 



The specific distinctness of this form from 7\ tamyae is ren- 

 dered doubtful by better specimens than were available to Professor 

 Heilprin. 



TURRITELLA MEGALOBASIS Dall. 

 Plate 14, fig. 6. 



Turritella megalohasis Dall, Trans. Wagner Inst., vol. 3, pt. 2, p. 310, pi. 

 17, fig. 11, 1892. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida; Dall. 

 U. S. Nat. Mus. No. 165120. 



This seems to be a rare species, and no more material has come 

 to hand. 



TURRITELLA CHIPOLANA Dall. 



Turritella chipolana Dall, Trans. Wagner Inst., vol. 3, pt. 2, p. 312, pi. 22, 

 fig. 24, 1892. 



Oligocene of the Tampa silex beds at Ballast Point, Tampa Bay, 

 and of the Chipola marls, on the Chipola Kiver, northwest Florida. 

 U. S. Nat. Mus. No. 165121. 



