198 



twisted, and reflected; parietal wall glazed with a thin callus." — 

 Bartsch. 



Type locality: — San Pedro, Cal. 



3033 Bittium Oldroydse 



"Shell very large, chestnut brown. (Nuclear whorls decollat- 

 ed in all our specimens.) Post-nuclear whorls moderately 

 rounded, ornamented with three spiral keels, which are truncated 

 on their posterior margin and slope gently anteriorly until they 

 fuse with the general mass of the shell. These keels divide the 

 space between the sutures into four almost equal parts, the space 

 between the summit and the first keel being a little narrower than 

 the rest. In addition to the spiral keels, the whorls are marked 

 by slightly retractive axial ribs, of which 12 occur upon the sec- 

 ond, 14 upon the third and fourth, 16 upon the fifth to seventh, 

 18 upon the eighth, 20 upon the ninth and tenth, and 22 upon the 

 penultimate turn. These ribs extend from the summit to the 

 suture. Their intersections with the spiral cords form strong, 

 cusped nodules, which slope more abruptly anteriorly than pos- 

 teriorly. The spaces inclosed between the spiral keels and the 

 axial ribs are considerably wider than the ribs or cords and form 

 squarish pits. Sutures strongly marked, showing a slender, 

 smooth, peripheral cord (to which the axial ribs extend,) on 

 almost all the turns. Periphery and base of the last whorl well 

 rounded, marked by six well-rounded spiral cords, which grow 

 successively weaker, and a litle more closely spaced from the per- 

 iphery to the umbilicus. Entire surface of spire and base crossed 

 by numerous slender axial lines of growth. Aperture moderately 

 large, channeled anteriorly; posterior angle obtuse; outer lip 

 rendered sinuous by the external sculpture; columella stout, flex- 

 uose, and reflected; parietal wall covered with a thick callus." — 

 Bartsch. 



Type locality: — Lower California. 



3034 Bittium fetellum 



Type locality: — Catalina Island, Cal., in 16 fms. 



3035 Bittium giganteum 



Type locality: — San Diego, Cal., post-Pliocene. 



3036 Bittium casmaliense 



Type locality: — Santa Barbara Co., Cal., Lower Pliocene. 



3037 Bittium Arnoldi 

 Type locality same as last. 



3038 Bittium mexicanum 

 Type locality: — Gulf of Cal. 



3039 Cerithiopsis (Cerithiopsis) tuberculides Cpr. 

 Mazatlan. 



3039A Variety Albonodosa Carpenter. Mazatlan. 



3040 Cooper, J. G.: 



On the natural history of the Farallon Islands. Zoe 3:151: — 

 Mollusca. Enumerates the following species. 



276 Martesia intercalate Cpr 



360 Entodesma saxicola Baird 

 1038 Psephis tellimyalis Carpenter. 



484 Rupellaria lamellifera See 2186. 



413 Chama pellucida Broderip. 



126 Mytilus Calif ornianus 



128 Septifer bifurcatus 



