ARNOLD] FOSSIL MOLLUSKS FROM CALIFORNIA 435 



OCINEBRA MICHELI Ford, var. WALDORFENSIS, new variety 

 PI. LIV, fig. IO 



Description. — Shell averaging about n or 12 millimeters in 

 altitude, rather slender, spindle-shaped; apex acute. Whorls 5, 

 prominently angulated in the middle ; anterior portion convex, pos- 

 terior flat or concave, with a slight curving back of the posterior 

 margin where it appresses against the preceding whorl. Sculpture 

 consists of axial varices and spiral lines ; axial varices (8 on penul- 

 timate whorl) are broad and rounded anterior to angle, narrower and 

 sharper behind ; the spiral lines are prominent only below the angle 

 of each whorl ; they are equal, rounded, ornamented by imbricating 

 plates of growth, and are separated by distinct impressed interspaces ; 

 anterior portion of whorl sculptured by fine lines of growth. Suture 

 appressed and not very distinct. Columella rather long, narrow, 

 and recurved ; spirally ribbed like body whorl. Aperture broadly 

 pyriform; canal long, narrow, and recurved. 



Dimensions. — Altitude, 11 mm.; latitude, 5 mm. : altitude of body 

 whorl, 8.4 mm. ; longiture of aperture, 3.4 mm. ; latitude of aperture, 

 1.3 mm. ; canal. 3 mm. 



Notes. — This slender little Oclncbra differs from the typical O. 

 michcli in the following respects: It is slenderer, has less angular 

 whorls, and the imbricate sculpture on the posterior portion of the 

 whorl is less prominently developed ; the axial ribs are more promi- 

 nent posterior to the angle, the spiral lines are equal, not alternate, 

 the aperture is narrower, and the canal more recurved. Named for 

 the type locality, Waldorf asphalt mine. 



Type.— Cat. No. 165,261. 



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

 Santa Barbara, California ; locality No. 4473. 



Horizon. — Fernando formation, lower Pliocene portion. 



LEDA ORCUTTI, new species 



PL LV, fig. 9 



Description.- — Shell averaging about 7 millimeters in longitude, 

 solid, equivalve ; beaks slightly anterior ; anterior end rounded, 

 shorter ; posterior end rostrate, subacute ; base arcuate ; lunule long 

 and very narrow, separated from shell by deeply impressed line ; 

 escutcheon much broader than lunule, its surface prominently con- 

 cave and its carina well developed, especially toward the posterior 

 end, sculpture consisting of several (7 in type) prominent wide 



