174 PALAEONTOLOGY OF CALIFORNIA. 



LIOCIUM, N. Gen. 



Shell elongate, spire high, apex dextral. Surface polished 

 and ornamented by stride or punctate markings. Aperture ovate, 

 not emarginate anteriorly; outer lip slightly sinuous, and bordered 

 by a thickened rim ; inner lip incrusted and smooth, bearing no 

 folds. 



The thickened lip, incrusted columella, shell texture, and sculpture of the surface 

 of this shell, point to an alliance with Cinulia (Avellana) and Ringinella ; while its 

 elevated spire, entire anterior end of the aperture, and the absence of teeth or 

 folds, sufficiently separate it from all known genera of the family. 



L. PUNCTATUM, n. S. 

 PL 28, Fig. 59. 



Shell minute, elongate, slender, spire elevated; whorls seven, 

 very slightly convex, suture faint, extreme apex rather blunt. 

 Surface highly polished, and marked anteriorly by a few faint 

 revolving lines of punctations. Aperture elongate oval, acute 

 posteriorly; outer lip slightly sinuous, bordered b}' a thickened 

 rim, about twice as thick as the shell walls, and longitudinally 

 striate: this thickening continues uninterruptedly around the 

 anterior end of the mouth; inner lip incrusted, smooth. 



Length, .18 inch ; width of body whorl, .06 inch ; length of aperture, .06 inch. 



Rare in the Shasta Group, south of the road from Colusa to the Hot Sulphur 

 Springs in the first range of Foot Hills, Colusa County, associated with Cordiera 

 mitrceformis, Atresius llratus, and the following species. It is a beautiful little 

 shell, and can be at once recognized by its minute size, slender form, polished sur- 

 face, and by the characteristic punctate sculpture. 



RINGINELLA, d'Orb. 



R. POLITA, n. s. 

 PL 28, Fig. 60. 



Shell small, subovate, spire prominent; whorls six, rounded, 

 body whorl slightly flattened on the sides, narrowing in advance, 



