63 



804 Flabellina opalescens 



"^Eolis (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. Branchiae 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 V 2 ; 

 breadth, % 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 branchiae 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. 



Sbell 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 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. 



810 Fissuridea aspera Eschscholtz. 

 Sitka to San Diego, Cal. 

 Pilsbry, Nautilus 5:105. 

 Synonym of Fissurella aspera. 



811 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. 



