2o6 CALIFORNIA ACADEMY OF SCIENCES [Proc. 30 Ser. 



Chorus carisa'ensis n. sp. 



Plate XVII, Figs. 90 and 91. 



Shell rather large and thick, strongly spinose, and oblique; spire moder- 

 ately high, sloping above; body whorl narrowing rapidly below; aperture 

 large, triangular, bearing a stout tooth on the outer lip near the upper end 

 of the canal; canal narrow, short, and strongly recurved; columella crusted 

 and strongly recurved; surface marked only by strong lines of growth. 

 There are about 8 strong spines on the angles of each whorl, excavated in 

 front and conve-x behind. 



Occurrence. — This shell is common, though not plentiful in 

 the lower Etchegoin Beds of the Mount Diablo Range, near 

 La Panza Springs, San Luis Obispo County. 



California Academy of Sciences, 

 July 31, 1905. 



