1914] 



Martin: New Species of Fossil MoUusca 



195 



The axial sculpture of this species is somewhat variable. On some 

 specimens it is quite coarse while on others it is very faint, hardly 

 more than lines of growth. It is frequently absent from the anterior 

 portion of the whorls. A slight angulation is apparent on the body- 

 whorl of some of the largest specimens. 



This species is similar in general appearance to Drill ia graciosana 

 Arnold. It may be distinguished from the latter by the following 

 characters : number of whorls greater, axial ribbing most pronounced 

 on the posterior portion of the whorls instead of on the anterior as in 

 D. graciosana Arnold, a greater number of spiral bands separated by 

 narrow grooves, D. graciosana having interspaces equal in width to 

 the ribs. 



Transmitted December 16, 1913. 



DESCRIPTIONS OF LOCALITIES 



1549. In the sea-cliff about two hundred yards east of the bath-house situated 

 on the beach south of Bolinas, Marin County, California. 



1736. In the bed of Twelve Mile Creek one and one quarter miles due south- 

 west of Baden Station. 



1780. In the sea-cliff about one mile due west of the mouth of Afio Nuevo 

 Creek, San Mateo County, California. 



1859. In the sea-cliff at the mouth of a small gulch one-third of a mile north 

 of the mouth of Guthrie Creek, about eight miles southwest of Ferndale, 

 Humboldt County, California. 



1860. In the sea-cliff about one hundred yards north of Locality 1859. (See 

 above). 



1863. In the sea-cliff about one quarter of a mile south of the mouth of Bear 

 Creek, Humboldt County, California. 



1878. In the east bank of Eel River about three quarters of a mile north of 

 Scotia, Humboldt County, California. 



