308 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



Kadiak, though Macoma inquinata Deshaj^es has frequently been 

 reported under the name of nasuta. It seems to occur in Japan, where 

 it was named TelUna dlssimilis by von Martens, 1865, but is not the 

 Tellina dissimilis of Deshayes, 1854. The young was described by 

 Gould as TelUna tersa, 1852. 



MACOMA LEPTONOIDEA Dall, 1895. 



Santa Barbara Channel, California, in 811: to 322 fathoms. Also at 

 Matagorda Baj% Texas. 



This ver}^ distinct species occurs in shallow water on the Texas 

 coast and in very deep water on the coast of California. It probably 

 antedates the separation of the two oceans. 



MACOMA CARLOTTENSIS Whiteaves, 1880. 



Arctic Ocean south to Avatcha Bay, Kamchatka on the west, and to 

 the Aleutians and eastward to Chilkat Inlet, Alaska. 



One of the handsomest species when in perfection, and character- 

 ized especially b}' its brilliant periostracum and subtriangular form. 

 3Iacoma frig Ida Hanley, 1844, should be compared, though very 

 likely only a variety of calcarea Gmelin. TdUna frigida Krause, 

 1885, from author's specimens, proves to be the young of Macoma 

 haltliica Linnaeus. 



MACOMA LIOTRICHA Dall, 1897. 



Aleutian and Shumagin islands to Puget Sound. 

 A thin oval shell, with glossy yellow periostracum. 



MACOMA EXPANSA Carpenter, 1865. 



Puget Sound to Baulinas Bay, California. 



This must be regarded as a doubtful species. The two specimens 

 upon which it was founded belong to diti'erent species and neither 

 agrees with Carpenter's diagnosis. A large broken valve with the 

 teeth wanting probably belongs to the preceding species. The orig- 

 inally more perfect pair has also met with accidents, and is really too 

 young for satisfactory determination. Specimens from Baulinas Bay, 

 California, collected by Stearns, which have been associated with the 

 specimens named by Carpenter, may belong to a valid species which 

 will carry the name. 



MACOMA BALTHICA Linnaeus. 1758. 



Arctic and boreal seas generally. On the Pacitic it has been collected 

 in northern Japan, and as far south on the northwest coast as Monte- 

 rey, California. 



This widely dispersed form is abundant about Bering Sea, but the 



