Paleontology Zorritos Formation 37 



marked by a flat-topped keel bearing four of the spiral bands. 

 The spiral sculpture decreases in strength toward the base, 

 and the longitudinal ribs converge toward the point of the 

 columella. The columella is biplicate, the posterior fold 

 rising sharply at its anterior end. The aperture is narrow, 

 and the anterior canal reflexed. The apical angle is some- 

 what wide for the genus. Altitude, 2.6 cm. ; maximum 

 diameter, 9 mm. 



T. tubcrosa differs from T. gaiisapata Brown and Pils- 

 bry,-- from Gatun, and its varieties lacz'ifasciola Maury,-^ 

 from Cercado de Mao, Santo Domingo, and herviderana n. 

 var., in its wider apical angle, less prominence of the longi- 

 tudinal ribs on the main body of the whorl, and compara- 

 tively broader fasciole. T. tuherosa has fewer spiral bands. 

 T. protcxta Conrad, most recently described by Maury -^ 

 from Santo Domingo, though not as close as the gaiisapata 

 group, is similar in general conformation. The spiral bands 

 in protcxta are much broader, and the longitudinal ridges 

 less elevated. The fasciole is more prominent in tnberosa. 



Zorritos formation. Zorritos. 



Family COXIDAE 

 Genus Conus Linnaeus 



Conns iniiUiliratns var. gaza Johnson and Pilsbry 



Conus gaza Johnson and Pilsbry, Proc. Ac. Nat. Sc. Phila., 

 vol. 63, p. 342, pl. 2^. figs. 2. 3, 1911. 



Conus gaza Maury, Bull. Amer. Pal., vol. 5. Xo. 29, p. 46, pl. 

 7, fig. 12, 1917. 



Conus inultiliratus var. gaza Woodring, Bowden Ms. 



"The shell is biconic, diameter over half the length, the 

 spire is nearly one-third the total length, concavely conic, 

 attenuate towards the apex. Post-embryonic whorls about 



-Proc. Ac. Xat. Sc. Phila.. vol. 63, p. 340. pl- 22. figs. 8. 9, 191 1- 

 ^Bull. i\mer. Pal., vol. 5. Xo. 29. p. 27. pl. 3. fig. 19. i9U- 

 =*Bull. Amer. Pal., vol. 5. Xo. 29, p. 28, pl. 4, fig. r, 1917- 



