CRETACEOUS FOSSILS. 99 



PSEUDOLIVA, Swains. 



P. LINEATA, n. 8. 

 PL 18, Fig. 52. 



Shell nearly conical; whorls four, spire low, suture excavated, 

 bordered by a rounded rim on the succeeding whorl ; body whorl 

 terminating above in a rounded or somewhat flattened border, 

 below which is a narrow, concave depression; below this the 

 whorl attains its greatest width, and then gradually narrows, 

 sometimes a little convexly, to the anterior end. Sides of the 

 aperture nearly parallel; incrustation of the columella small, 

 thin, and not extending posteriorly beyond the aperture; anterior 

 sinus broad, shallow; posterior sinus placed entirely in the upper 

 surface of the whorl, next the suture, twice as wide as deep. 

 Canal but slightly incurved. Surface ornamented by numerous 

 linear, revolving ribs, and by a single, deep impressed line, about 

 the middle of the whorl. 



Figure, average size. 



Locality: Northeast of Martinez, in Division B.; collected by Mr. Mathewson. 



P. VOLUTLEFORMIS, n. S. 

 PL 28, Fig. 212. 



Shell thick, robust, resembling in shape the subgenus Athleta 

 of the Volutes. Spire elevated, acute; whorls five and a half, 

 sloping; suture irregular; body whorl sloping inwards convexly. 

 Aperture long, rather narrow, biangular above, deeply notched 

 below; outer lip simple, acute; inner lip heavily incrusted; 

 columella slightly twisted in advance. Surface ornamented by a 

 row of prominent, compressed tubercles on the angle of the body 

 whorl, and below this by a series of revolving, impressed lines, 

 faint above the median groove, more distinct below. 



Figure, natural size. 



Locality: But two specimens of this beautiful but aberrant form have been 

 found; they are from near Fort Tejon, and were collected by Dr. Horn. 



