244 CALIFORNIA ACADEMY OF SCIENCES. 



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

 spiral sculpture of fine raised lines, with fine incremental lirute in the interspaces; aperture ovate; 

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

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

 raised and smoothly enameled. 



Dinie7isions. — Long. 38 mm.; lat. 21.5 mm.; body whorl 30 mm.; aperture 22.5 mm.; canal 

 1 1 mm. ; defl. 60 degrees. 



Hare in upper San Pedro series at San Pedro, Deadman Island, and Craw- 

 fish George's. 



Living. — Baulinas Bay to San Diego (Carpenter) : Lower California (Hemphill ) . 

 Pleistocene. — San Pedro (Arnold). 



Subgenus Pteronotus Sivainson. 

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



Murex trigonulus Lam. is a characteristic species. 



240. Murex (Pteronotus) festivus Hinds. 



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



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

 Pteronotus festivus Hds., Cpr., Brit. Assn. Rept., 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 closely /". (le./^^i/iy Gabb, of tlie Miocene of San Domingo and Hayti, 

 and the Pliocene of Florida. 



Rare in the lower San Pedro series at Deadman 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). 



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

 (Arnold). 



Subgenus Pterorhytis Conrad. 



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

 near its base. 



Type, Murex nuttalli Conrad. 



