98 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Probably Arnold's*^* Cancellaria irelaniana belongs to this 

 genus. 



Arnold's species is neither C. irelaniana Cooper, Cal. State 

 Min. Bur. Bull. no. 4, p. 42, pi. 1, fig. 5, nor C. irelaniana 

 Cooper, Bull. Dept. of Geol. Univ. of Cal, vol. 7, p. 282, pi. 12, 

 fig. 8. 



This new species is named in honor of Mr. Robert Anderson, 

 formerly with the U. S. Geol. Survey. 



Rimella canalifera (Gabb) 

 PI. 15, Fig. 10 



Rostellaria {Rimella) canalifera Gabb, Pal. Cal, vol. 1, 

 p. 123, pi 29, fig. 228, 1864. 



Shell small, somewhat fusiform; spire elevated, longer than 

 the mouth; suture deep; whorls convex, and marked by from 

 15 to 20 transverse folds, which become more prominent and 

 projecting on the large whorls ; entire surface also ornamented 

 by revolving rounded band-like ribs with linear interspaces; 

 aperture long, rather narrow, oblique, acute behind and broadly 

 and obliquely emarginate in front ; posterior angle of aperture 

 continued in a deep narrow callous canal, slightly curved along 

 the spire to the apex ; anterior canal broad and strongly curved 

 upwards; outer lip thick; inner lip callous. Locality 8, L. S. J. 

 U. Pal. Coll. 



Stellaxis cognata (Conrad) 



Solarium cognatum Conrad. 



Architectonic a cognata Gabb, Pal. Cal, vol. 1, p. 117, pi 

 20, fig. 72, 1864. 



"Shell low, conical ; whorls five, flat or slightly convex and 

 sloping above, acutely carinate on the margin. Mouth quad- 

 rangular, oblique. Surface marked by oblique lines of growth 

 and faint revolving lines, sometimes obsolete. Near the margin 

 on the upper surface, is a prominent isolated rib." Locality 8, 

 L. S. J. U. Pal. Coll. 



^Cancellaria irelaniana (Cooper), Arnold; Bull. 398, U. S., Geol. Surv., p. 286, pi. 

 26, fig. 22. • 



