306 PROCEEDINGS OF THE NATIONAL MUSEUM vol.xxhi. 



Pacific coast analog-ue of Strigilla flexuosa Say. All the Pacific coast 

 species so far reported have the sinus produced to the anterior adductor 

 scar, and confluent with the pallial line below. 



Genus TELLIDORA Morch. 

 TELLIDORA BURNETI Broderip and Sowerby, 1839. 



Lower California, south to West Colombia. 

 The Pacific analogue of Tellldora crhtata Recluz. 



Genus METIS H. and A. Adams. 

 METIS ALTA Conrad, 1837. 



Santa Barbara, California, south to San Diego, 



This species is identical with Scrohicularia hkinguJata Carpenter, 

 1856, and is also the Lutricola alta of the same author. It diflers from 

 the Mdh e.vcavata Sowerby, 1867, which extends from the Gulf of 

 California south to Peru and the Galapagos Islands, bv its bright yel- 

 low sufl'usion internally, its broader hinge plate, strong and deeply 

 immersed resilium, and usually by more or less brownish coloration 

 externally. The only other .species of the genus belonging to western 

 North America is the Metis dombeyi Hanley, 1846 (not of Carpenter), 

 distinguished by its smooth, white exterior, reddish internal flush in 

 many specimens, and evenly oblong form. This species has been con- 

 fused by Carpenter with Macoma {Psammacoma) aurora Hanlev, of 

 the same region, under the name of Sey^obicularia 2)roducta (1855); 

 l)ut this is not the TdUna jyroducta Sowerby (1868). Bertin has 

 wrongl}^ referred some Chinese shells to Metis excavata, all the species 

 being externall}^ ver}" similar. 



Genus MACOMA Leach. 

 MACOMA MIDDENDORFFII Dall, 1886. 



Bering Strait to the Aleutians and eastward to Chirikoflf Island. 

 Alaska; Okhotsk Sea, 



This is Macoma edentula Middendorfi', 1851, not of Broderip and 

 Sowerbj?^, 1839. Recognizable by its high triangular form, solid shell, 

 with broad hinge plate and flattened left valve. 



MACOMA INCONGRUA von Martens, 1865. 



Bering Strait to Japan and Puget Sound. 



This is TcUina rotundata Soyvevhy, 1S67, Tclh'na 7iasata yar. truncafa 

 Middendorfi', 1851, not Tellina truncata Jonas, 1814; Macoma califor- 

 niensis Bertin, 1878, etc. 



