— 41 — 



it, and crossed by three or four fainter revolving raised lines. On 

 body-whorl the latter are stronger, about ten below the angle, and 

 continue spirally to the end of the long canal. Mouth not seen. 

 Length, about 0.85 inch; breadth of body-wborl, 0.35; canal, 0.25, with 

 body-whorl, 0.50. 



This shell appears much like some of the family Aporrhaidae, but no 

 evidence of expansions around the mouth was found, and it has a 

 distinct sinus above the angle. Only the one figured had shell remain- 

 ing, but several casts were also found in Rose Canon by Mr. Fairbanks. 



Drillia ullreyana n. sp. (PI. II, Figs. 25, 26.) 



General form oblong-rhombic: first three whorls smooth, conical; 

 fourth with seven strong knobs crossing it, and continuing on the six 

 following at regular intervals; crossed by about ten fine revolving riblets 

 above the middle, and four stronger ones below, increasing to about 

 thirty of uniform size on the body-whorl and canal. Mouth nearly 

 half of whole length, acute posteriorly, with a slight angle on upper 

 third. Canal tapering, straight, sinus deep behind angle. Length, 

 about 0.66 inch; breadth, 0.30; mouth and canal, 0.35 long, 0.12 wide. 

 Marysville Buttes, Mr. Watts; four similar specimens. 



The canal is long for a Drillia, but not more so than in D. raricostata 

 Gabb, which this much resembles, diflering in having the knobs more 

 numerous, shorter, and broader. The figures are twice the natural size. 



Mangilia suturalis n. sp. (PI. II, Fig. 27.) 



Form lanceolate; nuclear whorls three, fourth with ten strong ver- 

 tical riblets, continuing on next five whorls, but decreasing to six on 

 body-whorl; crossing entire whorl, but higher at middle, forming an 

 obtuse angle, marked by a strong revolving riblet; one strong riblet 

 parallel to this close to the suture, and one below angle. On the body 

 they increase to over twenty of uniform size. Strong lines of growth 

 cross these throughout, showing a deep sinus, mostly posterior to the 

 angle. Canal slightly twisted. Length, 0.55 inch; breadth, 0.08; 

 mouth, 0.29 long, 0.06 wide. Two specimens found at Marysville 

 Buttes by Mr. Watts, and one illustrated here of twice the natural size. 



Cordiera gracillima n. sp. (PI. II, Fig. 22.) 



Very slender, fusiform; first two whorls smooth, turbinate; third 

 with about twelve oblique subvertical riblets, which decrease to seven on 

 sixth whorl, narrow, meeting at sutures, and with four revolving riblets 

 crossing them, one along suture. A Avide interval between this and 

 the next anterior, forms an obtuse angle on whorls, continuing to the 

 upper third of body- whorl, below which the vertical ribs disappear. 

 On body-whorl about eight revolving riblets cross these, with three or 



