TRANSACTIONS OF WAGNER 

 788 



TERTIARY FAUNA OF FLORIDA 



Shell large, somewhat compressed behind, wide, with the posterior 

 cardinal angle in the anterior third ; cardinal line short, an impressed narrow 

 area in front of the beaks nearly half as long as the shell ; surface apparently 

 smooth (the type is an internal cast), umbones acute. Alt. 122, lat. 60, diam. 

 36 mm. 



This is the only large Mytilus of the J\I. cclitlis type in the east American 

 Pre-Miocene Tertiary. It somewhat recalls very large specimens of M. gallo- 

 provindalis Lam. 



Mytilus edulis Linne. 

 Mytilus edulis L., Syst. Nat., Ed. x., p. 705, 1758 ; Dull, Bull. U. S. Nat. Mus., 37, p. 38, 



pi. 54, %. 3, pl- 71, fig- 2, 1889. 

 Mytilus borealis Lam., An. s. Vert., vi., p. 126, 1819; DeKay, Nat. Hist. N. Y., Moll., 



p. 182, pl. 13, fig. 222, pl. 24, fig. 256. 



Mytilus pcllucidus Pennant, Brit. ZooL, iv., p. 237, pl. 66, fig. 3. 

 Modiola pulex H. C. Lea, Am. Journ. Sci., xlii., p. 107, pl. i, fig. 3, 1842 (young shell) ; 



not of Lam., An. s. Vert, vi., p. 112, 1819. 



Mytilus mingancnsis Mighels, Proc. Bost. Soc. Nat. Hist., i., p. 188, 1844. 

 Mytilus notatus DeKay, op. tit., p. 182, pl. 13, fig. 223, 1843. 

 Pliocene of Great Britain (Red Crag). 



Post Pliocene of the American coast from Labrador south to St. John's 

 River, Florida (Verrill), also in northern Europe and on the northwest coast 

 of America; recent from the Arctic Seas south to Fort Macon, North 

 Carolina; Coues. 



The writer has never observed this species in the Pleistocene of Florida 

 and the Carolinas ; the statement of its occurrence there is inserted on the 

 authority of Professor Verrill (Inv. An. Vineyard Sound, p. 693, 1873). 



Mytilus (Hormomya) exustus Linnc. 



Mytilus exustus L., Syst. Nat., Ed. x., p. 705, 1758 ; Lam., An. s. Vert., vi., p. 121, 1819? 

 Mytilus bidcns L., Syst. Nat., Ed. xii., p. 1157, 1767. 

 Mytilus domin^cnsis Lam., An. s. Vert., vi., p. 121, 1819; Orbigny, Moll. Ciibana, ii., 



p. 328, 1845. 

 Myti/us striatulus Schroter, Einl., iii., p. 449, pl. ix., fig. 16. 



Pliocene of the Caloosahatchie and Shell Creek, Florida, Ball and Will- 

 cox; Pleistocene of Simmons Bluff, South Carolina, Burns; and of the West 

 Indies; recent from Charleston, South Carolina, south to Bahia, Brazil. 



This well-known species is rare in the marls, and not especially abundant 

 in the Pleistocene. 



