THE MOUNT DESERT REGION 193 



Myacidae 

 Mya Linne 



M. ARENARIA LimiG, 1759, '^0. EUROPAE SEPTENDRIONALIS. " 



(Gould, 1870, Inv. Mass., p. 55, fig. 375.) This common clam 

 of the New England coast, and known as the soft clam, abun- 

 dant throughout the Region wherever there is enough mud 

 to hold one. From our experience, I am skeptical of the 

 reports of the young of this species being dredged from deep 

 water. What looked like young at first sight proved to be 

 Saxicava or Panomya. Is circumpolar alive and as a fossil. 

 A food for the raven, eider, and Arctic fox in Greenland. 



M. TRUNCATA Linuc. (Linne, 1758, Syst. Nat. ; Gould, 1870, 

 Inv. Mass., p. 58, fig. 376.) Blaney reports valves only. It 

 could have easily been mistaken for Panomya arctica unless 

 the valves were new and showed the triangular tooth. Re- 

 ported from Eastport, Casco Bay, Massachusetts Bay, 

 Georges Bank. Is also circumpolar. See "WTiiteaves, p. 148. 



Saxicavidae 

 Saxicava Bellevue 



S. ARCTICA (Linne). (Mya arctica Linne, 1767, Syst. Nat.; 

 Saxicava arctica Gould, 1870, Inv. Mass., p. 89, fig. 397.) A 

 very common form found wedged between stones in tide pools, 

 in the crevices of piles, and is a familiar object in the dredge. 

 Due to its habit it is quite variable in shape. Specimens taken 

 from the very small form up to 45 mm. in length. Stations : 

 D 5, 6, 10, 13," 37-40, 43, 71, 80 ; S 1, 2, 4, 9, 11-13, 31. Common 

 from Maine to Connecticut. See Whiteaves, p. 149. 



Panomya Gray 



P. ARCTICA (Lamarck). {Mya norvegica Spengler, 1793, 

 Skirv. U. S. Kjobenhaven ; Glycimeris arctica Lamarck, 1818, 

 Nat. Hst. Anim. sans Vert.; Panopaea arctica Gould, 1870, 

 Inv. Mass., p. 51, fig. 373 ; P. arctica Iredale, 1915, Proc. Mai. 

 Soc. London.) Gould mentions the interet of this shell on 

 account of the genus being found plentifully in the fossil 



