124 CALIFORNIA ACADEMY OF SCIENCES. 



48. Pandora (Kennerlia) filosa Carpenter. 



Plate XVIII, Fig. 3. 



Kennerlia filosa Cpr., Brit. Assn. Rept., 1S63, p. 638; Proc. Zool. Soc, 1864, p. 602. 



Shell small, planoconvex, elongate-oval, thin; umbones minute, about one-fourth length from 

 anterior extremity; anterior and posterior dorsal margins straight, making an angle of 160 degrees 

 at the umbo; ventral margin arcuate; posterior extremity long, narrowed and truncated at the end; 

 anterior rounded up from base but making an angle with dorsal margin ; a single prominent poste- 

 rior, submarginal ridge runs from umbo to extremity on each valve, being nearer the margin in the 

 flat valve; surface of both valves sculptured by numerous fine, concentric, incremental lines, and 

 that of the right valve by fine radiating sulcations; left valve with a thin hinge ossicle; right valve 

 with two ossicles, the anterior one being short. 



Dhnensions. — Long. 16 mm.; alt. 7 mm.; diam. 3 mm.; umbo to anterior end 4 mm.; to 

 posterior end 12 mm. 



The right valve of this little shell looks something like a wing, and resembles 

 Clidiophora punctata, but is distinguishable by the straight dorsal margin, radiating 

 sulcations, and narrower form. 



Specimens identified by Dr. Dall. 



One right and one left valve found in the lower San Pedro series of Deadraan 

 Island. The specimen figured is from the lower San Pedro series at Deadman Island, 

 and is now in the collection of Delos Arnold. 



Living. — Puget Sound (Carpenter). 



Pleistocene. — San Pedro (Arnold). 



Genus Clidiophora Carpenter. 



Shell inequivalve, thin, pearly inside; valves close, attenuate behind; right valve rather 

 tumid, with three hinge teeth, the posterior one elongated; left valve often with two teeth; ossicle 

 present; pallial line simple. 



Clidiophora claviculata Carp, is a characteristic species. 



49. Clidiophora punctata Conrad. 



Pandora punctata Con., Journ. Phil. Acad. Sci., Vol. VII, 1837, p. 228, PI. XVII, fig. i. 

 Clidiophora punctata Con., Cpr., Brit. Assn. Rept., 1863, p. 638. Cpr., Proc. Zool. Soc, 1864, 

 p. 598. Gabb, Pal. Cal., Vol. II, p. 90, 1869. Cooper, 7th Ann. Rept. Cal. St. Min., 

 1888, p. 235. Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 183. 



Shell rather small, suboval, much compressed, thin; umbo posterior to center, marginal, 

 not elevated; anterior dorsal margin concavely arcuate; anterior extremity rostrated; posterior 

 extremity evenly rounded; outer surface .sculjitured with fine, concentric, incremental lines; interior 

 pearly, punctate; right valve slightly tumid, with three hinge teeth; left valve with two hinge teeth. 



Dimensions.— \Mn%. 30 mm.; alt. 19.5 mm.; diam. 5 mm.; umbo to anterior end 21 mm.; 

 to posterior end 9 mm. 



Specimens identified by Dr. Dall. 



