468 Annals of the Carnegie Museum. 



1 20. Pisidium randolphi Roper. 



Pisidiiim randolphi i Roper, Nautihis, IX, 1896, p. 99. 

 Habitat. — Washington. 



121. Pisidium furcatum Sterki. 



Pisidium furcaluni Sterki, NaiUihn, XXVI, 1913, p. 118. 

 Habitat. — -Washington. 



122. Pisidium furcatum (?) rhombicum Sterki. 



Pisidium {furcatum var. ?) rhombicum Sterki, Nautilus, XXVI, 1913, p. 119. 

 Habitat. — Washington. 



123. Pisidium columbianum Sterki. 



Pisidium columbianum Sterki, Nautilus, XXVI, 1913, p. 117. 

 Variable. 

 Habitat. — British Columbia, apparently common. 



124. Pisidium proximum Sterki. 



Pisidium proximum Sterki, Nautilus, XX, 1906, p. 5. 

 Habitat. — British Columbia, Washington. 



125. Pisidium angelicum Rowel 1. 



Pisidium angelicum Rowell, Proc. Acad. Nat. Sci. Calif., III. 



The specimens seen by the writer were evidently young, and their 

 identification is somewhat doubtful. 



Habitat.- — California, Angel Island, near San Francisco. 



126. Pisidium marci Sterki. 



Pisidium marci Sterki, Nautilus, XXIII, 1909, p. 42. 



Closely resembles P. loveni Clessin (= lilljeborgii Clessin, teste 

 B. B. Woodward) of Europe, and may be identical. 



127. Pisidium fabale sp. nov. 



Mussel rather large, subequipartite, barely oblique, moderately 

 inflated, outlines oval to almost elliptical, or posteriorly subtruncate 

 obliquely outward and the supero-anterior slope very slightly marked; 

 in young and adolescent specimens these features are more marked, 

 and there is a distinct angle at the junction of the superior and posterior 

 margins; beaks slightly behind the middle, moderately large, rounded, 

 slightly elevated and little projecting over the hinge margin; scutum 

 slightly or barely marked, narrow, scutcllum not noticeable; surface 



