248 CALII'DKNIA ACADKMY OF SCI1CNCE8. 



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

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

 whorl; incremental lines prominent; spiral liration on upper whorls; suture in)i)ressed, distinct; 

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

 perforate; canal long, narrow, curved backwards. 



Dinuitsioits. — Long. 90 mm.; lat. 62 mm.; boily-whorl 7S mm.; ajjcrturc 40 mm.; canal 

 25 mm.; defl. 95 degrees. 



A beautiful shell, one of the lai-gest gastrojiods found in this formation. 



Rare in npiier San Pedro series at Crawfi.sh CJeorge's, Los Cerritos, and San 

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



Living. — Catalina Island to San Diego; Lower California (Coo[)er) : Sitka 

 (Carpenter): .lapan (Tryon). 



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



Pliocene. — San Diego well (Dall). 



Genus Eupleura //. X- A. Adams. 



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

 varices; aperture dentate within. 



Eupleura caudata Say is a characteristic species. 



247. Eupleura muriciformis llrudcrij). 



Plate IX, Fic. 16. 



Ranella muriciformis Brod., Proc. Zool. Soc, 1832, p. 179. Rve., Conch. Icon., Ranclla, PI. \'II, 



fig. 34, 1844. 

 Ranella plica/a RvE., Proc. Zool. Soc, 1S44, p. 13S; Conch. Icon., Ranella, PI. VII, fig. 33, 1844. 

 Ratiella triquetra RvE., Proc. Zool. Soc, 1844, p. 139; Conch. Icon., Rariella, PI. VII^ fig. 41, 



1844. Cpr., Brit. Assn. Re()t., 1863, p. 667; 1856, p. 201. Gari!, Pal., Vol. II, 



p. 73, 1S69. Cooper, 7th Ann. Rept. Cal. St. Min., 1888, p. 262. 

 Eupleura muriciformis 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, X890, p. 145. 

 Eupleura 7tiuriciformis (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 ne.xt 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 the 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. 



