400 REPORT OF COMMISSIONER OF VISH AND FISIHERINS. [694] 
to VeraCruz. New Maven, common on oysters, living, but perhaps intro- 
duced from Virginia. New York Ifarbor, on oysters, (8S. Sinith). Fort 
Macon, North Carolina (Yarrow). Georgia (Couper). Tampa Bay, Flor- 
ida (Conrad, Jewett). Texas (Ramer), Near Vera Cruz (coll. 'T, Salt, in 
Yale museuin). 
MOobIoLaAnta NIGRA Lovén, Plate XXX], fig. 236. (p. 433. 
Ofvers. af Kongl. Vet-Akad., Forhandl., vol. iii, p. 187, 1446; Moreh, Naturhist. 
Bidrag, Grénland, p. 93, 1857; JL and A, Adains, Genera, vol. ii, p. 515, 1454 5 
Gould, Invert, ed. ji, p. 190, figs. 487, 444. Modiola nigra Gray, Appendix to 
Parry’s Voyage, p. 244, 1824; Hanley, Recent Shells, p. 242. Mylilun diacrepans 
Stimpson, Shella of New England, p. 12, 1451 (not of Muropean authors), 
Modiola nesa Gould, Invert., ed. i, p. 124, fig. 46 (young). 
Circumpolar: Greenland, southward to Long Island; Spitzbergen, 
southward to Great Britain and MWolland; Behring’s Straits, southward 
to Okhotsk. Not uncommon and of good size in Vineyard Sound, 10 
to 15 fathoms, off Gay Ifead, etc.; common in Casco Bay and Bay of 
Fundy, of large size, low-water to 60 fathoms; Stonington, Connecticut, 
in stomach of cod, (Linsley). 
Fossil in the Post-Pliocene of Maine, Canada, Labrador, and Northern 
Europe. 
MODIOLARIA DIScoRS Beck. 
Lovén, Ofvers, af Kong]. Vet-Akad. Forhandl., vol. iii, p. 187, 1846; Gould, Invert, 
ed, ii, p. 83, figs, 449, 490. Mylilun discors Linn’, Syst. Nat., ed. xii, p. 11595 
Stimpson, Shells of New England, p. 12, (non Gould, ed. i). Mytilus discrepans 
Montagna, Test. Brit., p. 169. Modiola discrepans Lamarck, Anim, sans Vert., ed. 
ii, vol. vii,p.23; Gould, Invert., ed. i, p, 129, fig. #3.  Modiola lavigata Gray, 
Appendix to Parry’s Second Voyage, p. 245, Mylilus Invigulus Stimpson, Shells 
of New England, p.12. Modiolaria luwigala Loyén, op. cit., p. 187, 1846; Stimp- 
son, Check-Liast, p. 2, 1460; this Report, p. 509. 
Circumpolar: Greenland, southward to Long Ssland; 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 Jocal 
south of Cape Cod. Saint George’s Bank and vicinity, common, (S. I. 
Smith, Packard). Gardiner’s Bay, Long Island, rare, (S. Sinith), North 
of Hebrides, in 530 fathoms, (t. Jeffreys). 
Fossil in the Post-Pliocene of Canada, Greenland, and Northern 
Kurope. I am unable to separate M. laevigata, as a species, from the 
ordinary New England form, usually referred to M. discors, the differ- 
ences being due chiefly to age. The common Kuropean form of discors 
shows more differences, but is probably only a dwarf variety of the 
Kame species. 
MODIOLARIA CORRUGATA Mirch. Plate XXXI, fig. 235. (p. 509.) 
Op. cit., p. 94, 1457; Stimpson, Check-List, Smithsonian Inst., p. 2, 1860; Gould, 
Invert.,ed. ii, p. 194, fig. 491, Mytilus corrugatus Stinpson, Shells of New 
England, p. 12,1451. Mytilus discors Gould, Invert., ed. i, p. 120, fig. 44 (non 
Linné, sp.), 
Long Island to Greenland and Northern Europe. Off Martha’s Vine- 
