'2\i CAMl'dKNlA ACADKMY OF SC^IENCM. 



prominent nodes; a single, less prominent, rounded node on angle between each jxiir of varices; 

 spiral sculpture of fme raised lines, with fine incremental liruhi' in the interspaces; aperture ovate; 

 canal long, narrow, slightly recurved, and generally covered by overgrowing sides; lower jiart of 

 columella slightly widened; outer lip thickened by varix, smooth inner surface; inner lip slightly 

 raiseil and smoothly enameled. 



Ih'iiit-tisions. — Long. 38 mm.; lat. 21.5 mm.; body whorl 30 mm.; ajjcrturc 22.5 mm.; canal 

 1 1 mm.; defl. 60 degrees. 



Kaio in upper San Pedro series at San Pedro, Deadman Isliiml, iiml Craw- 

 fish George's. 



Living. — BaidinasBay to San Diego (Carpenter) : Tiower r'alitornia (ITciii|iliiin. 

 J^leisloccne. — San Pedro (Arnolds 



Subgenus Pteronotus Smainson. 

 Shell triangular; varices fin-like or foliated; canal moderate, closed, somewhat curved. 

 Murex trigonulns Lam. is a characteristic species. 



240. Murex (Pteronotus) festivus Hinds. 



Murex festivus Hds., Proc. Zool. Soc, 1843, p. 127; Voyage Sulphur, p. 9, PL III, figs. 13 and 



14, 1844. Tryon, Man. Conch., Vol. II, p. 116, PI. XXXV, fig. 383, 1880. 

 PleronohiS festivus Hds., Cpr., Brit. A.ssn. Rcpt., 1863, p. 663. Gabb, Pal. Cal., Vol. II, p. 70. 



1869. Cooper, 7th Ann. Rept. Cal. St. Min., 1888, p. 261. Dall, Trans. Wagner Inst. 



Sci., Vol. Ill, Part I, 1890, p. 142. Keep, West Coast Shells, p. 22, fig. 3, 1892. 



Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 216. 



Shell of moderate size, fusiform; spire elevated, short; whorls si.x, subangulate, crossed by 

 three prominent, reflexed, frill-like varices; a single rounded node between each set of varices; 

 numerous spiral lines, which are almost obsolete, ornament the intervarical .spaces; suture deeply 

 impressed; aperture pyriform; outer and inner lips smooth; canal long, narrow, slightly curved; 

 columella squamose on outside, widened slightly. 



Dimensions. — Long. 40 mm.; lat. 21 mm.; body-whorl 31 mm.; aperture, not including 

 canal, 12 mm.; canal 11 mm.; defl. 65 degrees. 



This species is characterized by the sharp, frill-like varices said by Dr. Dall 

 to resemble quite c\osQ\y P. textilis Gabb, of the Miocene of San Domingo and Hayti, 

 and the Pliocene of Florida. 



Hare in the lower San Pedro series at Deadraun Island; not uncommon in the 

 upper San Pedro series at Deadman Island, Crawfish George's, San Pedro and Los 

 Cerritos. Found also in the Pleistocene at Spanish Bight, San Diego. 



Living. — San Pedro to San Diego; Lower California (Cooper). 



Pleistocene. — Santa Barbara; San Diego (Cooper): San Pedro; San Diego 

 (Arnold). 



Subgenus Pterorhjrtis Conrad. 



Varices wing-like; aperture usually dentate within the outer lip, with a produced tooth 

 near its base. 



Type, Murex nuttalli Conrad. 



