164 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 109 



U-shaped in the left valve, rounded and somewhat larger in the right 

 valve; lov^er edge of pallial sinus scar not confluent with pallial line. 



Dimensions: Holotype, closed shell, length, 22.8 mm., height, 

 18.1, depth, 9.19; right valve, height, 18.3 mm., depth, 6.1; left 

 valve, height, 17.3 mm., depth, 4.4. 



Repository: Holotype in U. S. National Museum, No. 610301. 



Type locality. — About 2.5 miles off Point Barrow base, Alaska. 

 Depth, 110 feet. Bottom: stones, mud, gravel (haul containing many 

 Psolus jahricii (sea cucumber) and sea anemones, m^ostly Stomphia 

 coccinea). Collected by G. E. MacGinitie, Sept. 15, 1948. 



Remarks: Although this shell was empty, the right valve had 

 apparently been drilled only recently. The posteroventral margin is 

 somewhat shortened by breakage. This species is named in honor of 

 Mr. ]Max Adams, an Eskimo who served G. E. MacGinitie as head 

 boatman during the summer of 1948. 



Family Lyonsiidae 



Genus Lyonsia Turton, 1822 



Lyonsia norvegica (Ginelin, 1790) 



Mija norvegica Gmelin, 1790, p. 3222. 



Mya striata Montagu, 1815, p. 188, pi. 13, figs. 1 and A. 



Lyonsia norvegica Jeffreys, 1865b, p. 29, pi. 2, fig. 1 (good illustration). 



One specimen with a shell 36.3 mm. long and 19.4 mm. high was 

 taken at 420 feet. It appeared to be about 2}^ years old. A portion 

 of a valve 17.4 mm. high was taken at 328 feet. 



Other material examined: Over 100 specimens from the Shet- 

 lands, Ireland, the Hebrides, and the Mediterranean. 



Discussion: The Point Barrow specimens are less transparent than 

 the other material examined. (Several species of shells from Point 

 Barrow are more chalky and less transparent than the same species 

 from other localities.) 



Distribution: Point Barrow south to Juan de Fuca Strait; from 

 Lofoten, Norway, south to the Mediterranean, from the Shetlands, 

 the Faroes, and Iceland. 



Order Teleodesmacea 



Suborder Diogenodonta 



Family Astartidae 



Genus Astarte Sowerby, 1816 



Species in this genus are extremely variable, with the result that 

 some of them have been redescribed many times and endless varieties 

 have been named, these species and varieties being based on such 



