184 University of California Publications in Geology [Vol. 8 



spaces, and numerous less prominent axial ribs, producing a nodose 

 cancellated surface ; aperture ovate ; outer lip denticulate within ; inner 

 lip inerusted, marked with numerous plications; canal short and 

 broad. 



Dimensions. — Altitude of type, 31mm.; maximum diameter of 

 body-whorl, 20 mm. 



Occurrence. — Common in the Pliocene formations of the central 

 coast region of California; type from Merced Series of Bolinas Bay, 

 University of California Locality 1549. 



This species has long been referred to as Nassa fossata Gould. It 

 differs from the latter in the lack of distinct nodes and in the general 

 shape of the shell. 



Named in honor of Mr. Robert Moran. 



Genus Chrysodomus Swainson 



CHEYSODOMUS LAWSONI, n. sp. 

 Plate 19, figure 1 



Shell large, solid, elongate, with about nine tabulated whorls ; 

 spire strongly elevated, about two-fifths the total length of the shell ; 

 whorls of the spire slightly and evenly convex, with a deeply exca- 

 vated tabulation ; the axis of the shell and the plane of the tabulation 

 form an angle of ninety degrees or more ; upper whorls ornamented 

 with numerous spiral threads, alternately large and small, about five 

 on each whorl are more prominent than those intervening; the revolv- 

 ing sculpture on the lower whorls is almost obsolete ; it consists of 

 faint. Hat bands separated by narrower interspaces; suture distinct; 

 body-whorl large, convex, with a narrow, flat area in front of the 

 tabulation, producing a poorly defined collar; anterior portion of 

 the body-whorl conical; axial sculpture consists of lines of growth 

 which give the shell a roughened appearance; aperture elliptical; 

 outer lip thin; inner lip heavily inerusted; canal very long and 

 recurved, columella with anterior sulcus. 



Dimensions — Altitude of the type specimen, apex and canal 

 defective, 135 mm.; maximum diameter of the shell, 55 mm.; length 

 of the aperture, 50 mm. ; length of the canal, 20 mm. ; apical angle, 

 40 degrees. 



