THE MOUNT DESERT REGION 185 



Pandoridae 

 Pandora Bruguiere 

 P. (Clidiophora) gouldiana Dall. (P. trilineata Conrad, 

 1832, Amer. Marine Conch.; P. trilineata Gould, 1870, Inv. 

 Mass., p. 62, fig. 379; P. {Clidiophora) gouldiana Dall, 1886, 

 Bull. M. C. Z.) This curious shell is easily recognized by its 

 pearly substance. Its home is on sandy bottoms in sheltered 

 water. It is common in the region of Somes Sound and the 

 waters off Northeast Harbor. We did not take it in any other 

 place. Stations : D 27, 43, 51, 53, 62, 63, 144. Common from 

 Maine to Connecticut, Grand Manan, Cape Breton, Prince 

 Edward Isle. 



Lyonsiidae 

 Lyonsia Turton 



L. HYALiNA Conrad. {Mya hyalina Conrad, 1831, Jour. 

 Acad. Nat. Sci. Phila. ; L. hyalina Conrad, 1832, Amer. Marine 

 Conch.; Gould, 1870, Inv. Mass., p. 64, fig. 380.) This form 

 is common in low water in the inner Bay and inside the 

 islands to the south. Stations : D 10, 11, 25, 26, 27, 28, 37, 62, 

 63, 64, 65, 66. Common from low-water mark to 30 fathoms, 

 Elaine to Connecticut; Bay of Fundy, low-water mark to 30 

 fathoms (Verrill). 



L. ARENOSA (Moller). {Pandorina arenosa Moller, 1842, 

 Kr0yer's Naturh. Tidskr. ; L. arenosa Gould, 1870, Inv. Mass., 

 p. 65, fig. 381.) Reported from Eastport, Frenchmans Bay, 

 but we did not take it. A Greenland shell that Verkruzen 

 collected in the Annapolis Basin, See ^Vhiteaves for critical 

 remarks. 



TELEODESMACEA 



Pleurophoridae 



Cyprina Lamarck 



C. isLANDiCA (Linne). {Venus islandica Linne, 1767, Syst. 



Nat. ; C. islandica Lamarck, 1818, Hist. Nat. Anim. sans Vert. ; 



Gould, 1870, Inv. Mass., p. 129, fig. 443.) This is the 'Arctic 



clam' and easily distinguished from the Vemis mercenaria or 



