252 CALIKDHNIA ACADKMY OF SCIENCES. 



fii^mvil is the type, wliicli cnine from tlio lower f^aii Pedro series at Dcadiinm Island, 

 and is now in the United Stales National Miisenni. 

 /'A /s/(»7'H(!. — San Pedro (Arnold). 



253. Trophon (Boreotrophon) scalariformis (!,>iil,l. 



Platk VI, I'lc. Id. 



Fusus scalariformis Gld. , Invert. Mass., p. 288, fig. 208. 

 Trophon scalariformis Gld., Tryon, Man. Concli., Vol. II, p. \.\\. I'l XXXI, fij>:. 314, 1880. 



Shell small, iusiform, spire elevated, subacute; wliorls I'niir or five, convex, crossed by about 

 thirteen prominent rounded ribs, most prominent in middle of whorl; body-wiiorl ventricose; 

 suture impressed, distinct; aperture broadly ovate; outer li|) slightly effuse; inner lip curved, 

 smooth; columella lonp, rather narrow, curved, smooth; canal of medimn leny;th, narrow. 



Dimensions. — Long. 16 mm.; lat. 7.5 mm. ; body-whorl 10.5 mm.; aperture, including canal, 

 S mm.; canal 3 mm.; defl. 44 degrees. 



Somewhat resembles T. muUicostatna, but is distingui.?hable by lack of angula- 

 tion in whorls, longer columella and canal, but rather more ventricose body-whorl; 

 easily distinguishiible from 7'. pcclronnn by more depressed aspect of shell and lack 

 of spiral lines. Very faint spiral lines .sometimes visil)le. Specimens itientified by 

 Dr. Dall. 



Rather common in lower San Pedro series, rare in Pliocene of Deadman 

 Island; found in the lower San Pedro series at San Pedro; and in the u|)])er San 

 Pedro series at Crawfish George's. The si:)ecimen figured is from the lower San 

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



Living. — Circuraboreal. (Julf of St. Lawrence. 



Pleistocene. — San Pedro (Arnold). 



Pliocene. — San Pedro (Arnold). 



254. Trophon (Boreotrophon) stuarti Smifh. 



I'l.ATK. VI, Fic. A. 



Trophon s/uar/i Smith, Proc. Zool. Soc, 1880, p. 481, PI. XLVIII, fig. 6. 



Trophon orpheits Gld., Cpr., Brit. Assn Rept., 1863, p. 663 (in part). Tryon, Man. Conch., 



Vol. II, p. 139, PI. XXXI, fig. 310, 1880 (in part). Coopkk, 7th Ann. Rept. Cal. vSt. 



Min., 1888, p. 268 (in part). Keep, West Coast Shells, p. 21, 1892 (in part). 



Shell of medium size, fusiform; spire elevated, acute; whorls seven, sharply angular, crossed 

 by nine to eleven frill-like varices which rise to .sharp points on angle; whorls ornamented with two 

 to three sharp, spiral ridges, one of which revolves on angle; aperture semielliptical; outer lip 

 thickened, smooth within; inner lip incrusted, projecting; columella long, twisted, squamose; canal 

 long, narrow, slightly curved. 



Dimensiofis. — Long. 30 mm.; lat. 13 mm.; body -whorl 2 mm.; ai)erture, including canal 

 16.5 mm.; canal 8 mm.; defl. 52 degrees. 



Distinguishable by prominent, frill-like varices and sharp spiral lines, which 

 give latticed appearance. Specimens identified by Dr. Dall. 



