[120] 



3. Mesembrinus inscendens, Binney. 



Plate 14, figure 21. 



Shell rimate, thin, narrowly turrited, suture well marked; 

 whorls 7, with minute revolving lines, the apex ribbed ; aperture 

 narrowly ovate, oblique, lip simple, columellar margin reflected. 

 Reddish-brown. 



Length 36, diam. 10 mill. 



Lower California. 



THAUMASTUS, Albers. 

 1. Thaumastus pallidior, Sowerby. 



Plate 13, figure 9. 



Elongate-ovate, rimate, striate by growth lines ; spire 

 elevated, acuminate, whorls 6, convex, the last two-thirds the 

 total length; aperture subovate, lip reflexed, its extremities 

 approaching and connected by a slight callus. White, yellow- 

 ish white within. 



Length 37, diam. 23 mill. 



San Juan, Gulf of California ; Cape St. Lucas, Lower Cali- 

 fornia. 



2. Thaumastus Californicus, Reeve. 



Plate 13, figure 14. 



Ovately turrited, thin, scarcely umbilicated ; spire elevated- 

 conical ; whorls 6, smooth ; aperture oval, lip sharp, expanded, 

 columellar margin reflexed. White, with transverse bluish-black 

 zones. 



Length 19, diam. 10 mill, 



California (Reeve). 



Probably from Lower California. Very closely allied to ser- 

 perastrus, Say. 



