AKNOI.n - TUK rAl.KONTOlAHJY ANH S 11! \ IKUtAini V OF SAN PEDRO. 253 



Rare in Pliocoiic of DeadinMii Islnnd ;iml 'I'inuii"- I'diiit; also reported from 

 lower San Pedro series at Dondnian Island. The s]H'cinien li,<;iired is from (ho 

 Pliocene at J)ea(hnan Island, and is now in the collection of Dcdos .\rnold. 



Liring. — Sitka to Straits of Fiica; Wa.shington (Coojior). 



Pkistoeeue. — San Pedro; San Diego (Cooper) : San Pedro ( .\ mold). 



Pliocene. — San Pedro (.Viiidhn: San Die.uo well (Dall). 



255. Trophon (Boreotrophon) stuarti Smilli var. praecursor, var. nov. 



Pi.ATK VI, Fn;. a. 



Shell small, elongate-fusiform; spire elevated, acute; whorls si.x or seven, angulated above, 

 crossed by about fifteen sharp varices, ami with two shar]5 spiral lines; suture deeply imjiressed 

 distinct; aperture subelliptical; outer lip eft'use, smooth; inner lij) smooth; columella long, straight, 

 nearly smooth; canal long, narrow, very slightly curviii. 



Dimensions. — Long. 15 mm.; lat. 5.5 mm.; body-whorl 10 mm.; aperture, including canal, 

 8 mm.; canal 4.2 mm.; defl. 33 degrees. 



Distiiignishable from 7'. sfnar/i. hy smaller size, less prominent transverse 

 frills and sjiiral lini's, and slenderei" form; distinguishable from T. dix/iarlUa by much 

 more sharply defined senlptiire and more angulated whorls. Pronounced var. jjrre- 

 cursor of T. sdntrti by Dr. Dall. Type from Pliocene of Deadman Island. 



Not uncommon in Pliocene and lower San Pedro scries of Deadman Island. 

 Found also in Pleistocene at bath-house, Santa Barbara. The specimen figured is 

 the type, which was found in the Pliocene of Deadman Island, and is now in the 

 collection of Delos Arnold. 



Pleistocene. — San Pedro (Arnold). 



Pliocene. — San Pedro; Santa Barbara (Arnold). 



256. Trophon (Boreotrophon) tenuisculptus Carpenter. 



Trophon lenuisculptus Cpr., Ann. & Mag. Nat. Hist., 3rd Sen, Vol. XVII, 1866, [>. 277. Gabb, Pal. 

 Cal., Vol. II, p. 70, 1869. Trvon, Man. Conch., Vol. II, p. 139, PI. XXXIII, fig. 359, 

 1880. Cooper, 7th Ann. Rept. Cal. St. Min., 1888, p. 268. 



Shell small, fusiform; whorls five, angulated above, forming a slightly sloping, tabular band 

 above; ornamentations of numerous transverse ridges and several spiral lines; suture deeply 

 impressed; aperture elliptical; outer lip thin: inner lip incrusted, smooth; canal narrow; columella 

 long, twisted. 



Dimensions of a Young Specimen. — Long. 14.5 mm.; iai. 6.1 mm.; body-whorl 10 mm.; 

 aperture and canal 8 mm.; canal 4.5 mm. ; defl. 50 degrees. 



Distinguishable by numerous transver.se ridges, which are more numerous 

 than in any other member of this genus found in this locality. Type of species 

 from Plei.stocene of Santa Barbara. Specimen identified by Dr. Dall. 



Rare in Pliocene of San Pedro district. 



Pleistocene. — Santa Barbara (Carpenter). 

 Pliocene. — San Pedro (Arnold). 



