198 
twisted, and reflected; parietal wall glazed with a thin callus.”’— 
Bartsch. 
Type locality: —San Pedro, Cal. 
3033 Bittium Oldroydze 
‘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) tuberculoides 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 intercalata Cpr 
$60 Entodesma saxicola Baird 
1038 Psephis tellimyalis Carpenter. 
484 Rupellaria lamellifera See 2186. 
413 Chama pellucida Broderip. 
126 Mytilus Californianus 
128 Septifer bifurcatus 
