694 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



to Vera Cruz. New Haven, common on oysters, living, but perhaps intro- 

 duced from Virginia. New York Harbor, on oysters, (S. Smith). Fort 

 Macon, North Carolina (Yarrow). Georgia (Couper). Tampa Bay, Flor- 

 ida (Conrad, Jewett). Texas (Reenter). Near Vera Cruz (coll. T. Salt, in 

 Yale museum). 

 Modiolaria nigra Loven. Plate XXXI, fig. 236. (p. 433.) 



Ofvers. af Kongl. Vet.-Akad., Forhandl., vol. iii, p. 187, 1846 ; Morch, Natnrhist. 

 Bidrag, Gronland, p. 93, 1857 ; H. and A. Adams, Genera, vol. ii, p. 515, 1858 ; 

 Gould, Invert., ed. ii, p. 190, figs. 487, 488. Modiola nigra Gray, Appendix to 

 Parry's Voyage, p. 244, 1824 ; Hanley, Recent Shells, p. 242. Mytilus discrepans 

 Stimpson, Shells of New England, p. 12, 1851 (not of European authors). 

 Modiola nexa Gould, Invert., ed. i, p. 128, fig. 86 (young). 



Circumpolar : Greenland, southward to Long Island ; Spitzbergen, 

 southward to Great Britain and Holland; Bearing's Straits, southward 

 to Okhotsk. Not* uncommon and of good size in Vineyard Sound, 10 

 to 15 fathoms, off Gay Head, etc. ; common in Casco Bay and Bay of 

 Fundy, of large size, low-water to 60 fathoms ; Stouington, Connecticut, 

 in stomach of cod, (Linsley). 



/ Fossil in the Post-Pliocene of Maine, Canada, Labrador, and Northern 

 Europe. 

 Modiolaria discors Beck. 



Loven, Ofvers. af Kongl.Vet.-Akad. Forhandl., vol. iii, p. 187, 1846 ; Gould, Invert., 

 ed. ii, p. 83, figs. 489, 490. Mytilus discors Linne", Syst. Nat., ed. xii,p. 1159; 

 Stimpson, Shells of New England, p. 12, (wore Gould, ed. i). Mytilus discrepans 

 Montagu, Test. Brit., p. 169. Modiola discrepans Lamarck, Anim. sans Vert., ed. 

 ii, vol. vii,p. 23; Gould, Invert., ed. i, p. 129, fig. 83. Modiola laevigata Gray, 

 Appendix to Parry's Second Voyage, p. 245. Mytilus levigatus Stimpson, Shells 

 of New England, p. 12. Modiolaria laevigata Love"n, op. cit., p. 187, 1846 ; Stimp- 

 son, Check-List, p. 2, 1860 ; this Report, p. 509. 



Circumpolar : Greenland, southward to Long Island ; Finmark, 

 southward to Great Britain; Behring's Straits, southward to Puget 

 Sound. Very common in Casco Bay and Bay of Fundy, low-water to 

 100 fathoms; not uncommon in Massachusetts Bay; rare and local 

 south of Cape Cod. Saint George's Bank and vicinity, common, (S. I. 

 Smith, Packard). Gardiner's Bay, Long Island, rare, (S. Smith). North 

 of Hebrides, in 530 fathoms, (t. Jeffreys). 



Fossil in the Post-Pliocene of Canada, Greenland, and Northern 

 Europe. I am unable to separate M. Icevigata, as a species, from the 

 ordinary New England form, usually referred to M. discors, the differ- 

 ences being due chiefly to age. The common European form of discors 

 shows more differences, but is probably only a dwarf variety of the 

 I same species. 

 Modiolaria corrugata Morch. Plate XXXI, fig. 235. (p. 509.) 



Op. cit., p. 94, 1857 ; Stimpson, Check-List, Smithsonian Inst., p. 2, 1860; Gould, 

 Invert., ed. ii, p. 193, fig. 491. Mytilus corrugatus Stimpson, Shells of New 

 England, p. 12, 1851. Mytilus discors Gould, Invert., ed. i, p. 130, fig. 84 (wore 

 Linu6, sp.). 



Long Island to Greenland and Northern Europe. Off Martha's Vine- 



