338 CAIJFOHNIA ACADEMY OK SCIKNCKS. 



395. Fissuridea aspera KkcIiucIioU:. 



Fissurella aspera Escii., Zt)ol. Atlas, Vol. V, p. 21, PI. XXIII, fiu;. 5, iS.^.V 



Glyphis aspera EscH., Ci'R., Proc. Zool. Soc, 1856, p. 223. Cru., Brit. Assn. Rcpt., 1863, \>. 651. 



Gabb, Pal. Cal., Vol. II, p. 85. 1869. Cooper, 7th Ami. Rcpt. Cal. .St. Min., 1888, 



p. 241. Keep, West Coast Shells, p. 96, fijj. 80, 1892. 

 Fissuridea aspera Esch., Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 197. 



Shell oblong, conical; anterit)r and posterior slopes only very slightly convex; a])ical liolc 

 anterior to center, nearly circular, the plane of its outer rim sloping considerably forward; numerous 

 prominent, straight, rough ribs radiate from the apical hole and produce a corrugated margin for the 

 shell; inner side of rim corrugated and slightly efTuse; inner surface smooth. 



Dimejisions. — Long. 60 mm.; hit. 42 mm.; all. 23 mm. 



Easil}' di.'stingui.shiiblo by its large size mikI prmniiKMil, loiiuli, radiiiting ridges 

 and alternating color bands. Has fewer and rougher ril).s tliaii /'^. jiinrinn, and a 

 more elliptical apical hole. 



Not uncommon in the lower Sun Pedro series at Dcachnan Island and San 

 Pedro; common in the upper San Pedro series at Crawfish George's, and rare in the 

 same formation at Los Cerritos, Deadman Island, and San Pedro. 



Living. — Sitka to San Pedro (Cooper), 



Pleistocene. — Santa Barbara to San Pedro (Cooper): San Pedro (Ainuld). 



396. Fissuridea inaequalis Sonrrbij, 



Fissurella inaqualis Sby., Proc. Zool. Soc, 1834, p. 126; Conch. 111., fig. 45. Reeve, Conch. 



Icon., fig. 50. 

 Glyphis intgqualis S^\., Cpr., Brit. Assn. Rept., 1856, p. 1S4, Pi. VII, figs. 4^-4 «. Tryon, Man. 



Conch., Vol. XII, p. 215, PI- XXXIV, figs. 63, 64, 1890. 

 Fissurella pica Shy., Proc. Zool. Soc, 1834, p. 126; Conch. 111., Vol. II, figs. 32, 33. Reeve, 



Conch. Icon., fig. 49. 

 Fissurella inecqualis \?iX. pica Sby., Cpr., Brit. Assn. Rept., 1856, p. 184. Tryon, Man. Conch., 



Vol. XII, p. 215, PI. XXXIV, fig. 64, 1890. 



Shell oblong, conical, much depressed; anterior and ])osterior surfaces convex; lateral view 

 of margin a line convex upward (as if shell had been on a convex surface); radiating ridges numer- 

 ous and fine; concentric ridges numerous and nearly as prominent as the radiating ridges; the two 

 systems of lines giving the surface a decidedly canceilate apjiearance; apical hole slightly oblong, 

 anterior to center; inner surface smooth; inner surface of margin finely corrugated; color white. 



Dimensions. — Long. 22.5 mm.; hit. 12 mm.; alt. 6 mm. 



Distinguishable from other members of this genus occurring in this formation 

 by its small size and the convex appearance of the sloping sides. The specimen 

 described was identified by Dr. Dall. 



Six specimens in the upper San Pedro series of San Pedro; also found in llie 

 same horizon at Los Cerritos, Deadraan Island, and Long Beach. 



Living. — Guacomayo; Galapagos Islands (Carpenter). 



Pleistocene. — San Pedro (Arnold). 



