48 
nat mus pr 33:177-183. 
Numbers 565-573 are described in this paper. 
565 Seila montereyensis 
Monterey, Cal., to Todos Santos bay, Baja Cal. (Hemphill). 
566 Bittium (Stylidium) eschrichti icelum 
Neah bay, Wash., Monterey, Cal. (R. E. C. Stearns). 
567 3B. Eschrichti montereyensis. Monterey, Cal. 
568 Bittium esuriens multifilosum 
Whorls 10, length 9.2, diameter 3 mm; 7 spiral keels between 
the sutures on the whorls of the spire. 
Type locality:—White’s Point, San Pedro, Cal. (Mrs. Old- 
royd). Also from Monterey and Catalina Island. 
569 Bittium tumidum 
Type locality:—Monterey, Cal. (Canfield). 
570 Bittium quadrifilatum ingens 
Type locality: —Monterey, Cal. 
571 Cerithiopsis cosmia 
Monterey, Cal. south to Todos Santos bay, Baja Cal. (Stearns). 
572 Cerithiopsis (Cerithiopsis) pedroana 
“Shell small, slender, dark brown. Nuclear whorls 3, yellow- 
ish-white, smooth. Post-nuclear whorls strongly differentiated 
from the nuclear ones, showing the sculpture characteristic of the 
adult shell from the beginning. This sculpture consists of 3 
equally spaced tuberculate spiral keels between the sutures, the 
posterior one of which is slightly smaller than the other two. 
These keels are separated by deep, rounded channels almost as 
wide as the keel. In addition there are many low, rather broad 
axial ribs, the intersections of which with the keel form the 
tubercles. About 20 of them occur upon the Ist, 22 upon the 5th, 
and 30 upon the penultimate post-nuclear turn. The connections 
between the tubercles, both spiral and axial, are about equal, 
inclosing deep, squarish pits. In addition to the above sculpture 
the entire surface is marked by fine spiral lines and lines of 
growth. Sutures strongly marked, constricted, showing the 
peripheral keel in the later whorl. Periphery marked by a broad, 
low, rounded keel. Another of equal width is located upon the 
middle of the base. The sulcus which separates these keels and 
the supraperipheral sulcus are of equal width; both are crossed 
by the weak continuations of the axial ribs, which gradually 
weaken as they pass toward the columella. The basal keel is 
separated from the columella by broad, shallow grooves. Aper- 
ture irregularly oval, decidedly channeled anteriorly, outer lip 
thin, rendered sinuous by the external keel; columella stout and 
somewhat twisted, with a strong callus on its inner edge that ex- 
tends over the parietal wall.’’-—Bartsch, U. S. nat mus pr 40: 
335. Also 33:181-182. 
4 1 ype locality:—-Terminal Island, Cal—Point Abreojos, Baja 
al. 
573 Metaxia diadema 
Monterey, Cal., to San Diego, Cal. (F. W. Kelsey). 
