434 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 50 



latitude, 11.5 mm.; longitude of aperture without canal, 10 mm.; 

 latitude of aperture, 5 mm. 



Notes. — This variety differs from the recent typical form in that 

 the former has an average of many more (23 instead of 15) longi- 

 tudinal ribs, more (9 instead of 7) spiral ridges, and a relatively 

 narrower revolving table above the angle. 



Type.— Cat. No. 165,322, U. S. N. M. 



Locality. — Fugler Point asphalt mine, 1 mile north of Gary r 

 Santa Barbara County, California (U. S. G. S. locality No. 4475). 



Horizon. — Fernando formation (lower Pliocene). 



NASSA WALDORFENSIS, new species 



PL LIV, fig. 17 



Description. — Shell averaging about 13 to 15 millimeters in alti- 

 tude, sharply conical in outline, apex subacute. Whorls 6, convex, 

 angulated near posterior margin. Suture appressed, distinct, wavy, 

 sculpture consisting of sharp axial ribs (13 on penultimate whorl), 

 extending with almost equal prominence from suture to suture, 

 and prominent squarish revolving ridges (5 on penultimate whorl) 

 separated by channeled interspaces, the whole presenting a most 

 characteristic cancellate appearance ; fine lines of growth are visible 

 under a lens. Columella' short, twisted and slightly curved ; sepa- 

 rated from body whorl by a distinct canal ; sculptured much less 

 prominently than whorls and by spiral lines only. Aperture broadly 

 elliptical ; canal short and sharply recurved ; inner lip incrusted ; 

 outer lip slightly dentate. 



Dimensions. — Altitude, 13 mm.; latitude, 6.5 mm.; altitude of 

 body whorl, 8 mm. ; longitude of aperture, 4.8 mm. ; latitude of 

 aperture, 2.8 mm.; canal, 1.2 mm. 



Notes. — This species is slenderer and has coarser axial sculpture 

 than N. perpinguis Hinds, and is somewhat smaller, relatively 

 broader, and has much sharper ribs than N. mcndica Gould ; it is 

 more closely related to the latter than to any other of the West Coast 

 species. Found abundantly in the Pliocene throughout southern 

 California. Named for the type locality, W r aldorf asphalt mine. 



Type.— Cat. No. 165,272, U. S. N. M. 



Locality. — Waldorf asphalt mine, 3 miles southeast of Guadalupe, 

 Santa Barbara County, California ; locality No. 4473. 



Horizon. — Fernando formation, lower Pliocene portion. 



