195 
3013 C: ingens. Monterey, Cal. 
3014 C: tumida. Monterey, Cal. 
8015 Bittium Johnstonze 
Type locality: —Baja Cal. (Mrs. E. B. Johnston). 
3016 Bittium purpureum 
Based on Cerithiopsis purpurea Cpr. 
Monterey, and Santa Barbara, Cal.—San Diego, Cal. 
8017 Bittium vancouverense 
Type locality: —Vancouver Island. 
8018 B: attenuatum boreale 
Vancouver Island. 
3019 Variety multifilosum. San Pedro, Cal. 
3020 Variety latifilosum. Terminal Island, Cal. 
3021 Bittium (Semibittium) subplanatum 
‘Shell broadly elongate-conic, milk white. Nuclear whorls a 
little more than one, well rounded, smooth. The first of the post- 
nuclear whorls well rounded, marked by three spiral cords, one of 
which is at the summit, another at the middle of the whorl, while 
the third is a little above the suture. The succeeding turns show 
four spiral cords, of which the one at the summit is a little less 
strong than the rest; the remaining three divide the space be- 
tween the sutures into four equal parts, beginning with the fourth 
whorl, intercalated cords make their appearance between the pri- 
mary ones, so that on the last whor!] we have an intercalated cord 
and sometimes two between all the primary cords; these, however, 
are never quite as strong as the principal ones. In addition to 
the spiral cords, the whorls are marked by decidedly curved, slen- 
der, well-rounded, almost vertical, axial ribs, which are scarcely 
indicated on the first turn, while 14 of them occur upon the sec- 
ond and third, 16 upon the fourth, 18 upon the fifth and sixth, 22 
upon the seventh, 24 upon the eighth, and 26 upon the penulti- 
mate turn. The intersections of the spiral cords and axial ribs 
form weakly developed, rounded tubercles which are truncated 
on their posterior margin, while the spaces enclosed between them 
are very shallow quadrangular pits. Sutures strongly constricted. 
Periphery and base of the last whorl well rounded, marked by 
slender, spiral cords of which those immediately below the per-~ 
iphery are the strongest and are truncated on the posterior mar- 
gin, sloping gently anteriorly. Of these cords, seven occur on the 
base of the type. Aperture rather large, irregularly oval, chan- 
neled anteriorly; posterior angle acute; outer lip thin, rendered 
sinuous by the external sculpture; columella decidedly oblique, 
strongly curved, and reflected.’’—Bartsch. 
Type locality:—Catalina Island, Cal. 
3022 Bittium (Semibittium) rugatum Cpr. 
Lower Pleistocene, Santa Barbara, Cal. 
3023 Bittium (Semibittium) Nicholsi 
Type locality:—Gulf of California. 
3024  Bittium (Semibittium) nitens Cpr. 
Type locality:——Cape San Lucas, Baja Cal. 
3025 Bittium (Lirobittium) interfossa Cpr. 
Synonymy:—Rissoa interfossa Cpr.—Cerithiopsis fortior Cpr. 
—Rissoina interfossa Cpr. 
Type locality:—Catalina Island, Cal. 
“Shell rather large and robust, white, sometimes light brown. 
Nuclear whorls small, two; the first obliquely tilted, smooth; the 
