63 
804 Flabellina opalescens 
“7olis (Flabellina) opalescens:—-Bluish white, pellucid, 
somewhat quadrangular, posteriorly wedge-shaped ending in a 
sharp point. Foot anteriorly with 2 short spreading appendages, 
laterally thin and flattened. Head short; tentacles 2, long, acute 
(the lower pair replaced by the appendages of the foot). Two 
erect, club-shaped appendages (dorsal tentacles) on the anterior 
part of the back, of an opaline color, with an orange stripe be- 
tween them. Branchie in 5 pairs of fasciculi along the upper 
edges of back, each bundle of about 4 rows, longest above, their 
color yellowish, with a purple or blood-red spot near the end. A 
rosy tint often visible from the string of ova shining through the 
abdominal walls. This elegant species is numerous in San Diego 
bay, California, in the winter, living among the grass, and depos- 
iting its ova on any fixed object it meets with. Length, 1%; 
breadth, 4% inch.’’—Cooper Cal ac pr 3:205. 
Flabellina opalescens Cooper Cal ac pr:—‘‘Dredged at Santa 
Barbara on a rocky bottom in a depth of 16 fathoms. A few also 
from the rocky shore of Santa Barbara Island, differing only in 
having the branchiz olive, tipped with white.’’ 
Monterey, Cal. 
805 Fluminicola hindsi Baird. 
Kootanie river, Montana. 
806 Fluminicola nuclea Lea. 
Oregon and Northern California. 
807 Fluminicola nuttalliana Lea. 
Keep, West Coast shells, 63, f 50. 
Shell globosely turbinate, thick, whorls 4 (apex generally 
eroded), convex, sutures well impressed; aperture large, widely 
ovate. Greenish, aperture blue within. Height 10, diam. 8.3 mm. 
Living: British Columbia; Sacramento river, California. 
808 Fluminicola virens Lea. 
Shell oval, thick, apex eroded, whorls 41%4-5, moderately con- 
vex; aperture narrow-ovate. Bright green, bluish within. Height 
10, diameter 6 mm. 
Living: Oregon and Northern California. 
809 Fenella laminata Carpenter. 
Santa Barbara to San Diego, Cal. 
$10 Fissuridea aspera Eschscholtz. 
Sitka to San Diego, Cal. 
Pilsbry, Nautilus 5:105. 
Synonym of Fissurella aspera. 
$11 Fissuridea murina Carpenter. 
Balenas bay, California, to Lower California. 
Synonym of Fissurella murina. 
812 Fusus barbarensis Trask. 
Santa Barbara to San Diego, Cal. 
813 Fusus luteopictus Dall. 
Farallon Islands to San Diego, Cal. 
814 Fusus polygonoides Lamarck. 
Catalina Island, California?—East Indies. 
