194 Kansas Academy of Science. 



to subacute; whorls five, convex; surface (a small patch of the shell 

 covering still remaining on one of the casts) ornamented with 

 wavy, oblique, incremental lines, some more prominent than their 

 fellows; suture distinct; aperture semilunar to suboval. 



This is a very common shell, running through all the series, both 

 at Gettysburg and East Clallam. 



Miocene: Oregon (Conrad). 



Oligocene-Miocene: Gettysburg, East Clallam, Wash. ( Reagan i . 



Subgenus Lunatia Gray. 



Naticidee with open umbilicus, without funiculum. Type, 

 Natica ampullaria ham. 



29. Polynices (Lunatia?) olympidii n. s. Plate III, fig. 29. 



Shell of medium size, ovate-globular ; spire elevated, conic . 

 whorls four, evenly convex, not shouldered; surface ornamented by 

 fine, oblique incremental lines and by very faint revolving striae 

 on lower part of body whorl; suture distinct; aperture semilunar: 

 outer lip sharp; inner lip incrusted; umbilicus open. 



Dimensions: Axial length 26; lat. 20; aperture 15x10. 



Distinguishable from JV. clausa and P. recluziana in having a 

 more elevated spire and in having its umbilicus open; and from 

 P. lewisii in its smaller size, more elevated spire, its lacking the 

 spiral groove, and by its having spiral striae on the body whorl. 



This species is found principally in the upper and lower series 

 of the Clallam formation at Gettysburg, Wash. A few speoimene 

 resembling the type were seen at East Clallam. 



Genus Sigaretus Lam. 



Shell depressed, auriform, with minute spire and with aperture 



greatly distended ; spirally striated or furrowed ; whorls rapidly 



widening; color usually white, sometimes with a thin, corneous 



epidermis; operculum small, horny. Sigaretus neritoideus Linne 



is a characteristic species. 



30. Sigaretus scopulosus Conrad. Plate III, fig. 30. 



Sigaretus scopulosus Con,, Wilkes's Expl. Exped., vol. X, p. 727, pi. 18, figs. 

 6, 6a, b, c. 



Shell resembles N. duplicata Say very much, but is compressed 

 and has the body whorl flattened a little on the upper part and also 

 somewhat extended. 



Shell flattened-globular, spire very slightly elevated, obtuse: 

 whorls two and a half to three; whorls having a long, slightly con- 

 vex slope from suture to near base, where it becomes a little rounded : 



