1914] 



Martin: New Species of Fossil Mollusca 



193 



cords, with much wider interspaces, crossed by axial ribs of smaller 

 size, the two intersecting in such a manner as to produce almost square 

 and equal reticulations, and small rounded nodes ; on the body- whorl 

 there are twenty spiral ridges and about forty axial riblets; on the 

 penultimate whorl there are seven spiral ridges and approximately 

 the same number of axial riblets as on the body -whorl; the spiral 

 ridges are augmented by faint spiral striations; aperture elliptical; 

 outer lip thin ; inner lip incrusted. 



Dimensions. — Altitude of the type specimen consisting only of the 

 body-whorl, 55 mm. ; maximum diameter of the shell, 45 mm. 



Occurrence. — Wildcat Series, Humboldt County, California. 

 University of California Locality 1878. 



This species may be distinguished by its even reticulate sculpture. 



Genus Drillia Gray 



DRILLIA FLEENERENSIS, n. sp. 

 Plate 22, figure 5 



Shell of medium size, fusiform, solid, with eight or nine strongly 

 sculptured whorls ; spire elevated ; apex acute, nuclear whorls absent ; 

 whorls of the spire slightly and evenly rounded, convex, sculptured 

 with twelve to fourteen raised, equal, equidistant, oblique ribs which 

 extend from suture to suture, but become very faint on the posterior 

 quarter of each whorl, producing a sutural band about one millimeter 

 in width ; ribs almost flat at top and in some cases carry a fine median 

 groove ; interspaces deep and about equal in width to the ribs ; sutures 

 distinct, impressed ; body-whorl well rounded, convex, sculpture 

 similar but less pronounced than on the whorls of the spire, obsolete 

 on the anterior portion ; spiral sculpture not visible on any portion 

 of the shell ; aperture elongate, ovate ; outer lip arcuate ; inner lip 

 incrusted, smooth ; posterior sinus narrow, moderately deep, canal 

 short, slightly curved. 



Dimensions. — Altitude of the type, apex defective, 31 mm. ; maxi- 

 mum diameter of the shell, 10.5 mm. ; length of the aperture, 9.5 mm. ; 

 length of the canal, 3 mm. -. apical angle, 25 degrees. 



Occurrence. — Uncommon in the Wildcat Series one mile south of 

 Centerville, Humboldt County, California. University of California 

 Locality 1860. This horizon represents the upper part of the series. 



