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. tuberosa differs from T. gausapata Brown and Pils- 

 bry, 22 from Gatun, and its varieties laevifasciola Maury, 23 

 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. tuberosa has fewer spiral bands. 

 T. prote.rta Conrad, most recently described by Maury 24 

 from Santo> Domingo, though not as close as the gausapata 

 group, is similar in general conformation. The spiral bands 

 in protexta are much broader, and the longitudinal ridges 

 less elevated. The fasciole is more prominent in tuberosa. 



Zorritos formation. Zorritos. 



Family CONIDAE 



Genus CONUS Linnaeus 



\ 



Conus multiliratus var. gaza Johnson and Pilsbry 



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

 vol. 63, p. 342, pi. 23, figs. 2, 3, 1911. 



Conus gaza Maury, Bull. Amer. Pal., vol. 5, No. 29, p. 46, pl. K 

 7, fig. 12, 1917. 



Conus multiliratus 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 



22 Proc. Ac. Nat. Sc. Phila., vol. 63, p. 340, pi. 22, figs. 8, 9, 1911. 



23 Bull. Amer. Pal., vol. 5, No. 29, p. 27, pi. 3, fig. 19, 1917. 



24 Bull. Amer. Pal., vol. 5, No. 29, p. 28, pi. 4, fig. i, 



