112 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



tiire is obscured by matrix and the end of the pillar broken off). 

 Height of shell 10.5, maximum diameter of base 10, minimum di- 

 ameter of base 9 mm. 



Tampa silex beds, at Ballast Point, Tampa Bay, Florida. TJ. S. 

 Nat. Mus. No. 1G6108. 



This shell has, in miniature, some resemblance to C. grammati- 

 cum Dall, of the Chipola beds, but the latter is a much larger species. 



Genus MARGARITES Leach. 



Margarita Leach, Thompson's Ann. Philos., voL 14, p. 202, 1819; not of 

 Leach, ZooL Misc., vol. 1, p. 107, 1815. 



Margarites (Leach Ms.) Gray, Ann. Mag. Nat. Hist., voL 20. 1847, p. 

 268.— Leach, Moll. Gt. Britain, 1852, pp. 147, 197. Type, Helix mar- 

 garita Montagu, Dall, U. S. Geol. Survey, Prof, paper, No. 59, p. 97, 



1909. 



MARGARITES TAMPASNSIS Dall. 



Plate 3, fig. 11. 



Margarita tampaensis Dall, Trans. Wagner Inst., vol. 3, pt. 2, p. 406, pi. 

 18, fig. 5, 1892. 



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

 Burns. U. S. Nat. Mus. No. 112573. 



The fine striation may or may not be present, especially on the 

 later whorls. 



Family DELPHINULIDAE. 



Genus LIOTIA Gray. 



lAotia Gray, Synopsis Brit. Mus., 1840 and 1842, name only; Proc. Zool. 

 Soc. London for 1847, p. 145. Type, Dclphinnla canccUata Gray.— H. 

 and A. Adams, Gen. Rec. Moll., vol. 1, 1854, p. 404.— Dall, Blake Gastr. 

 1889, p. 385. 



LIOTIA (ARENE) SOLARIELLA Heilprin. 



Plate 16, figs. 4, 5. 



Delphinula ? solariella Heilprin, Trans. Wagner Inst, vol. 1, p. 113, pi. 16, 



fig. 56, 1887. 

 Liotia (Arene) solariella Dall, Trans. Wagner Inst., vol. 3, pt. 2. p. 408, 

 pi. 17, figs. 1, la, 1802. 

 Tampa silex beds, at Ballast Point, Tampa Bay, Florida; Heilprin, 

 Dall and Burns, U. S. Nat. Mus. 165137. 



LIOTIA (ARENE) CORONATA Dall. 



Plate 16, figs. 6, 17. 



Liotia (Arene) coronata Dall, Trans. Wagner Inst., vol. 3, pt. 2, p. 409, 

 pi. 17, figs. 2, 2a, 1892. 

 Tampa silex beds. Ballast Point, Tampa Bay, Florida ; Dall. U. S. 

 Nat Mus. No. 112575. 



This species seems to be less abundant than the L. solariella, and 

 only the original specimens have yet come under my observation. 



