248 CALIFOKNIA ACADEMY OF SCIENCES. 



Shell large, broadly fusiform; spire slightly elevated; whorls five, sharply angulated, with 

 eight or nine nearly obsolete varices which rise to prominent blunt nodes or spines on the angle of 

 whorl; incremental lines prominent; spiral liration on upper whorls; suture impressed, distinct; 

 aperture ovate; outer lip not thickened, effuse; inner lip incrusted; columella widened; umbilicus 

 perforate; canal long, narrow, curved backwards. 



Dimejisions. — Long, go mm.; lat. 62 mm.; body-whorl 78 mm.; aperture 40 mm.; canal 

 25 mm.; defl. 95 degrees. 



A beautiful shell, one of the largest gastropods found in this formation. 



Rare in upjier San Pedro series at Crawfish George's, Los Cerritos, and San 

 Pedro. Found also in the Pleistocene at Barlow's ranch, Ventura. 



Living. — Catalina Island to San Diego; Lower California (Cooper) : Sitka 

 (Carpenter): Japan (Tryon). 



Pleistocene. — San Pedro (Cooper; Arnold): Ventura (Arnold). 



Pliocene. — San Diego well (Dall). 



Genus Eupleura //. d- A. Adams. 



Shell ranelliform, with a pair of lateral varices, one on either side, and intermediate smaller 

 varices; aperture dentate within. 



Eupkiora caudata Say is a characteristic species. 



247. Eupleura muriciformis Broderip. 



PL.4TE IX, Fig. 16. 



Ranella muriciformis Brod., Proc. Zool. Soc, 1832, p. 179. RvE., Conch. Icon., Ranclla, PI. VII, 



fig- 34. 1844- 

 Ranella plicaia RvE. , Proc. Zool. Soc, 1844, p. 138; Conch. Icon., Ranella, PI. VII, fig. 33, 1844. 

 Ranella triquetra RvE., Proc. Zool. Soc, 1844, p. 139; Conch. Icon., Ranella, PL VII, fig. 41, 



1844. Cpr., Brit. Assn. Rept., 1863, p. 667; 1856, p. 201. Gabb, Pal, Vol. II, 



p. 73, 1869. Cooper, 7th Ann. Rept. Cal. St. Min., 1888, p. 262. 

 Ejipleura miiricifortnis Brod., Cpr., Brit. Assn. Rept., 1856, p. 182. Tryon, Man. Conch., Vol. II, 



p. 168. PI. XXXIX, figs. 501, 502, 504, 505, 1880. Dall, Trans. Wagner Inst. Sci., 



Vol. Ill, Part I, 1890, p. 145. 

 Eupleura tnurici/ormis (van?) unispinosa Dall, Proc. U. S. Nat. Mus., Vol. XIV, 1891, p. 174, 



PI. VI, fig. 5. 



Shell of medium size, quite broadly fusiform, solid; spire elevated; whorls five, subangular 

 at lower one-third, concave to straight above, convex below; whorls crossed by varices at every two- 

 thirds revolution, the two varices on the body- whorl and the next varix posterior to these are 

 prominent, the others being obsolete in most cases; the varices are generally thin, webbed, and with 

 six obsolete spines; the spine at the shoulder is the most prominent, but the second spine, counting 

 forward, is the one corresponding to the axis of tlie intervarical nodes; the web between the shoulder 

 spine and the suture is bent forward; spiral ridges correspond to each spine; four nodes on angle of 

 whorl between each pair of varices; suture deeply impressed, distinct; aperture elliptical; outer lip 

 thickened by six dentiform calluses, one each between each pair of external spiral ridges; canal long, 

 narrow, nearly straight. 



Dimensions. — Long. 25.5 mm.; lat. 14 mm.; body-whorl 20.5 mm.; aperture, including 

 canal, 17.5 mm.; canal 7 mm.; defl. 70 degrees. 



