'J'J-l CALIFOUNIA ACADKMY OF SCIENCES. 



This s|HH'ies (•cciii>iL's a position nearly luiclway between .1/. ///"srr ami ,1/. 

 aapern. It dilTers from the first in liaving distinct transverse ridges on the u|iper 

 whorls, a smootli inii<M- lip, a slightly slenderer form, and a more impressed suture; 

 and dilTers from the second in having fewer transverse ridges, which arc obsolete, or 

 nearly so, on the hody-whorl, a narrower aperture, a slenderer form and more numer- 

 ous and sharper spiral lines. Pronounced a new variety of Jilosa by Dr. Dall. Its 

 characteristics would ally it a little more readily with M. aspera, but it has enough 

 distinctive features to separate it from both. 



Rare in lower San Pedro series of Deadman Island. 



Found in the Pleistocene at the ])ath-house, Santa Parbara. The specimen 

 figured is the type, which was found in the lower San Pedro series at Deadman 

 Island, and is now in the United States National Museum. 



Zin'nfyf.— West Coast (?) (Dall). 



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



Family T.VIT. FASCIOT.ARIID.E 

 Subfamily FUSING. 



Genus Fusus Lamarck. 



Shell fusiform; spire long, acuminate, many-wliorlcd; aperture oval, usually striate within; 

 outer lip simple; columella smooth; no umbilicus; canal long and straight. 



Fusus nicobaricus Lam. is a characteristic species. 

 207. Fusus barbarensis Trask. 



Pi.ATK IV, Fig. 15. 



Fusus barbarensis Trask, Proc. Cal. Acad. Sci. , Vol. I, 1855, p. 41. Cooper, 7th Ann. Rept. Cal. 



St. Min., 1888, p. 240. Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 217. 

 Fusus corpuknhis (not of Conrad, Wilkes' Expl. Exped., Vol. X, p. 728, PI. XX, fig. 4, 1849) 



Cooper, Bull. \o. 4, Cal. St. Min. Bureau, Part 3, 1894, p. 26. 

 Fusus dupetithouarsi {non Kiener), Cooper, Bull. No. 4, Cal. St. Mining Bureau, Part 3, 1894, P- 26. 



Shell of medium size, long, slender, fusiform, rather thin; whorls nine, evenly convex, crossed 

 by about ten rather low, rounded ridges, which fade out toward sutures; body-whorl sometimes lacks 

 these ridges, but in that case it generally has an irregularly, wavy surface ornamented with numerous 

 sharp, raised spiral lines with sometimes smaller lines intercalated; suture deeply appressed; aperture 

 subelliptical; outer lip thin, smooth margin, with prominent, internal spiral lines beginning just pos- 

 terior to margin; inner lip incrusted, sometimes not covering the spiral sculpture of columella; 

 columella long, nearly straight, except for curve backwards, spirally ridged; canal long, narrow, 

 nearly straight. 



Dimensions. — Long. 60 mm.; lat. 20 mm.; body-whorl 39 mm.; aperture, including canal, 

 31 mm.; canal 15 mm.; defl. 32 degrees. 



Distinguishable from F. robusius and F. rugosus by much slenderer form, longer 

 spire, more clear-cnt spiral lines, and longer and straighter canal. This is the oldest 



