VOLUTIDJS. 77 



VOLUTODERMA, Gabb. Shape similar to Fulgoraria, which it also 

 resembles more or less in surface sculpture; apex not papillate; inner 

 lip marked by from three to five well -marked folds, not very oblique, 

 and of pretty uniform size. This is a group of shells characteristic of 

 the cretaceous rocks and perhaps peculiar to them. They are all 

 somewhat slender, and are marked by longitudinal ribs; the columella 

 is always straight or nearly so, and the folds are as isolated and distinct 

 as those of Turbinella. But the most strongly distinguishing character 

 is the entire absence of the irregularly rounded mass at the apex of the 

 shell, one of the best characters of Fulgoraria. Cretaceous of United 

 States, Europe and India. 



V. NAVARROENSIS, Gabb. PI. 4, fig. 44. California. 



VOLUTOMORPHA, Gabb. Shell elongate, fusiform; whorls cancellated 

 by longitudinal and revolving ribs; columella with one very oblique 

 fold, and sometimes one or more smaller secondary folds. 



V. CONRADI, Gabb. PI. 4, fig. 45. A cast. Cretaceous, New Jersey. 



ROSTELLITES, Conrad. Narrow, subulate, with elongated spire, 

 numerous subequal plaits on the columella, and the outer lip somewhat 

 expanded anteriorly. 



R. TEX AN A, Conr. PI. 4, fig. 40. Cretaceous, Texas. 



VOLUTIFUSUS, Conrad. Fusiform; body-whorl finely striated or 

 smooth, with the exception of the shoulder, which is sometimes 

 tuberculated; columella plaited, folds two to three, sometimes very 

 prominent, oblique; apex papillated; initial whorl acute, subspiral, 

 narrow; beak produced, recurved or sinuous.* Miocene of Europe and 

 America. 



V. TYPCS, Conrad. PI. 3, fig. 36. North Carolina. 



ATHLETA, Conrad. Ovate, Voluta-shaped ; spire short, acute; columella 

 with plaits as in Valuta; a callus projecting on the shoulder, and 

 covering a portion of the spire. Cretaceous. Miocene of Europe. 



A. TUOMEYI, Conrad. PI. 3, fig. 37. Mississippi. 



LEIODERMA, Conrad. Shell largely covered with enamel; with very 

 oblique columellar folds; outer lip somewhat emarginate on the upper 

 part to its junction with the body-whorl; base deeply emarginate. 



L. LEIODERMA, Conrad. PI. 3, fig. 38. ' Cretaceous, Mississippi. 



PTYCHORIS, Gabb. Differs from Athleta in the want of the charac- 

 teristic callus, in being subglobular instead of subfusiform and 

 angulated, with very oblique folds on the anterior part of the columella. 



P. PURPURIFORMIS, Forbes. PI. 4, fig. 47. Cretaceous, India. 



* I am by no means convinced that Volutifusus should be separated 

 from Scaphella. Gabb. 



