THE MOUNT DESERT REGION 189 



Thyasiridae 

 Thyasira Lamarck 



T. GouLDii (Pliilippi). {Lucina flexuosa Gould, 1841, Inv. 

 Mass.; Lucwa gouldii Philippi, 1845, Zeitsch. fiir Malak. ; 

 Cryptodon gouldii Gould, 1870, Inv. Mass., p. 100, fig. 406; 

 Thyasira gouldii Dall, 1901, U. S. Nat. Mns.) This small ani- 

 mal, with its white shell about half an inch across, occurs 

 generally in deep water on mud and sand bottoms and is a 

 favorite food for haddock, cod, etc. Station : D 100. Not 

 reported from Woods Hole. ''Buzzards Bay, six fathoms, 

 mud"; also listed for "muddy bottoms off the open coast." — 

 Verrill. Eastport, Casco Bay, off Block Island, Stonington. 

 Widely but apparently very sparingly distributed from Bay 

 of Fundy to Labrador and Greenland at about 10 to 313 

 fathoms (Whiteaves). 



T. PLANA (Verrill and Bush). {Cryptodon plana, Verrill 

 and Bush, 1898, Proc. U. S. Nat. Mus^., vol. 20, p. 788, pi. 88, 

 figs. 3, 4.) Mr. Blaney reports that a few of this species were 

 identified by Professor Verrill and Miss Bush among a num- 

 ber of T. gouldii. We did not take it. Reported from Casco 

 Bay, Wiscasset, Penobscot Bay, Bay of Fundy, Halifax 

 Harbor. 



AxiNOPSis G. 0. Sars 



A. oRBicuLATA G. 0. Sars. (Sars, 1878, Moll. Reg. Arct. 

 Norv., p. 63, pi. 19, fig. lla-d; Verrill, 1882, Trans. Conn. 

 Acad., vol. 5.) Neither this species nor the variety A. in- 

 equalis were found in our dredgings. Blaney reports it as 

 rare and a few found off Ironbound Island. Reported from 

 Broad Sound, Casco Bay, 15 to 30 fathoms. The variety 

 A. inequalis is reported from off Cape Ann, 18 to 26 fathoms. 

 Verrill and Bush report the variety inequalis from Bay of 

 Fundy. 



