[689] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 395 



very common in Buzzard s Bay and Vineyard Sound, 1 to 5 fathoms, 

 especially in soft mud, in coves ; Chelsea Beach, etc., Massachusetts Bay, 

 common ; Casco Bay, rare. Nova Scotia (Willis). Huntington and 

 Greenport, Long Island, rare, (S. Smith). 



SOLENOMYA BOREALIS Totten. 



Amer. Jour. Science, vol. xxvi, p. 306, fig. 1, h, i, 1834 (Solemya borealis); Gould, 

 Invert., ed. i, p. 36 ; ed. ii, p. 50, fig. 372. 



Connecticut to Nova Scotia. Newport, Rhode Island (Totten). Chelsea 

 and Nahant, Massachusetts (Gould). Casco Bay and Portland Harbor 

 r are ; Vineyard Sound, at Cnttyhunk Island, rare. Stoningtou, Connec 

 ticut (Linsley). 



This species may prove to be only the mature state of the preceding, 

 but I have never seen specimens intermediate in character. 



YOLDIA LIMATULA Stiinpson. Plate XXX, fig. 232. (p. 432). 



Shells of New England, p. 9, 1851 ; H. and A. Adams, Genera, vol. ii, p. 548, 

 Plate 126, figs. 5, 56, 1858; Gould, Invert., ed. ii, p. 154, fig. 462. Nitcula 

 limatula Say, Amer. Conch., ii, Plate 12, middle figures, 1831 ; Gould, Invert., 

 p. 98, fig. 62. Leda limatula Stimpson, Shells of New England, p. 10, 1851. 



North Carolina to Gulf of Saint Lawrence. Common in Long Island 

 Sound 5 Buzzard s Bay; Vineyard Sound; Casco Bay, in 2 to 12 fathoms, 

 soft mud ; less common in the Bay of Fundy, 4 to 30 fathoms. Beaufort, 

 North Carolina (Stimpson, Cones). Huntiugton and Greenport, Long 

 Island (S. Smith). Nova Scotia (Willis). The specimens from Long 

 Island Sound are as large and fine as the northern ones. 



Fossil iii the Post-Pliocene of Canada, Virginia, North and South 

 Carolina; and in the Pliocene of South Carolina. An allied species ( Y 

 Icevis Say, sp., Conrad) occurs in the Miocene of Maryland and Sonth 

 Carolina. 



Yoldia myalls Stimpson ; Gould, Invert., ed. ii, p. 1GO, fig. 4C7 ; Nuculci 

 myalls Couthouy, 1838. This is often confounded with Y. limatida, though 

 quite distinct. It is a more arctic species, ranging from Massachusetts 

 Bay to the Arctic Ocean and Spitzbergeu, but it has not been found 

 south of Cape Cod, so far as known to me. The shells reported as such, 

 that I have seen, are Y. limatula. Gould reports the latter as from Nord- 

 land (McAndrew), but we suspect that Y. myalls or Y. sapotilla may 

 have been, in this case, mistaken for Y. limatula. 



YOLDIA SAPOTILLA Stimpson, 1851. Plate XXX, fig. 231. (p. 509.) . 



H. and A. Adams, Genera, vol. ii, p. 548; Gould, Invert., ed. ii, p. 159, fig. 466. 

 Nucula sapotilla Gould, Invert., ed. i, p. 100, fig. 61, 1841 ; Hanley, Eecent 

 Shells, p. 170, Plate 20, fig. 3. Leda ( Yoldia) sapotilla Stimpson, Shells of New 

 England, p. 10, 1851. Yoldia arctica Morch, op. cit., p. 93, 1857 (t. Dawson, 

 from specimen ; non Y. arctica Sars). 



Long Island to the Arctic Ocean, comparatively rare and local, chiefly 

 in deep water, south of Cape Cod. Off Gay Head, 19 fathoms, soft mud ; 

 off Buzzard s Bay, 25 fathoms, sand; east of Block Island, 29 fathoms, 

 27 V 



