ARNOLD — THE PALEONTOLOGY AND STHATIGKAPHY OF SAN PEDRO. 217 



Family LIII. CANCELLARIIDiE. 

 Genus Cancellaria Linnarck. 



Subgenus Cancellaria s. s. 



Shell oval, cancellated; last whorl ventricose; aperture ohlong-, canaliculated in front; canal 

 short, sometimes recurved; columella with several large oblique plications. 



Type, Cancellaria cancellata Linn. 



195. Cancellaria cooperi Guhh. 



Plate VII, Fic!. 8. 



Cancellaria {Narond) cooperi Gabb, Proc. Cal. Acad. vSci., \'ol. Ill, 1S65, p. 186. 

 Cancellaria cooperi Gabb, Tryon, Man. Conch., Vol. VII, p. 76, PI. IV, fig. 66, 1885. William- 

 son, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 211, PI. XXII, fig. 2. 



Shell fusiform; spire elevated, about one-third length of shell; apex subacute; whorls six to 

 seven, angulated, concave above, convex below; lower portion of whorl with ten to fourteen promi- 

 nent, rounded, slightly oblique ribs which end in tubercles on angle; lower part of whorl ornamented 

 with close-set spiral ridges, alternating in prominence; ridges on upper part of whorl less prominent; 

 body-whorl ventricose and crossed by raised incremental lines; suture appressed, wavy, distinct; 

 aperture semielliptical; outer lip not thickened, denticulated; inner lip heavily incrusted, and with 

 two sharp, oblique plications on lower part; columella slightly twisted, rough; canal short. 



Dimensions. — Long. 80 mm.; lat. 35 mm.; body-whorl 56 mm.; aperture, including canal, 

 35.5 mm. ; defl. 40 degrees. 



Rare in the upper San Pedro series of San Pedro; five specimens found. 



Mrs. Oldroyd has a fine living specimen of this species which was hauled up in 

 the fishermen's nets at San Pedro. The specimen figured is from the upper San 

 Pedro series at San Pedro, and is now in the collection of Delos Arnold. 



Living. — Monterey to San Diego (Cooper): San Pedro (Oldroyd). 



Pleistocene. — San Pedro (Arnold). 



196. Cancellaria crawfordiana Dall. 



Cancellaria crawfordiana Dall, Proc. U. S. Nat. Mus., Vol. XIV, 1891, p. 182, PI. VI, fig. i. 



Shell small, fusiform; spire elevated; whorls five or six, acutely angulated above near margin; 

 upper portion flat, forming revolving table; lower portion evenly convex; sculpture very prominent, 

 cancellated, consisting of about twenty-five nearly straight, equidistant, transverse ribs and about ten 

 equidistant spiral ridges of equal prominence with the transverse ones; incremental lines visible 

 between transverse ribs; suture impressed, very distinct; aperture semielliptical; outer lip slightly 

 thickened and faintly denticulate; inner lip not incrusted; columella with two prominent plications on 

 the inner side; canal short and broad. 



Dimensions. — Long. 37 mm.; lat. 16 mm.; body-whorl 24.5 mm.; aperture, including canal, 

 17.5 mm.; defl. 38 degrees. 



Resembles C. cooperi in shape, but is distinguishable by the prominent cancel- 

 lated sculpture. 



( 28 ) March 17, 1903. 



