TRANSACTIONS OF WAGNER 

 726 



' TERTIARY FAUNA OF FLORIDA 



Pccten principoides Emmons, Geol. N. Car., p. 280, fig. 198, 1858. 



Pcctcn clintonensis Meek, S. I. Checkl. Mioc. Fos., p. 5, 1864. 



ClilaiJiys (Placopecteii) Clintoniiis Verrill, Trans. Conn. Acad., x., p. 78, 1897, in part. 



Pecten princeps Verrill, op. cit., in syn., non Emmons. 



Pecten Mu/ieriVerriW, op. cit., in syn., not of Dall. 



Miocene of Coggins Point, Grove Wharf, York River, and James River, 

 Virginia, Rogers, Conrad, Lea, and Harris ; and of Maryland, Dr. Foreman ; 

 and of North CaroHna at Murfreesboro, Meherrin River, Emmons. 



This remarkable shell appears to be quite limited in its range, and is only- 

 known in the Miocene of Maryland, Virginia, and North Carolina. It presents 

 at a first glance a remarkable resemblance to the recent Pecten inagellanicus 

 (Ch.) Gmelin, which is doubtless its descendant. The latter can, however, be 

 at once discriminated from the fossil by the shorter hinge-line, higher auricles, 

 much narrower resiliary pit, and, usually, the smaller and less central adductor 

 scar of the recent shell. A very large series of both recent and fossil speci- 

 mens which I have carefully studied confirms the uniformity of the above- 

 mentioned characters. As a rule the radiating threads in the fossil are 

 markedly coarser than those of the living species. In both the byssal notch 

 of the adult is represented by a shallow sinuation, and the ctenolium, present 

 in the immature stages, is usually buried in shelly matter in the adult. 



Since so much confusion has occurred between these two species, a state- 

 ment of the synonymy of the living form may be useful. 



Pecten (Placopecten) magellanicus Gmelin. 

 Aiiatsinin magnum magcUanicutn, etc., Chemnitz, Conchyl. Cab., vii., p. 290, pi. 62, fig. 



597, 1784; Schroter, Einl. Conch., iii., p. 323, 1786; Favanne, pi. 55, fig. e, 2. 

 Osfrea magcllanica Gmelin, Syst. Nat., vi., p. 3317, 1792 (not 1788, as frequently quoted) ; 



Dillwyn, Descr. Cat. Rec. Sh., i., p. 250, 1817. 

 Ostrea grandis 'ioiz.wd^tx, Portland Cat., 1786 i^fide Humphrey). 

 Pecten grandis Humphrey, Mus. Cal., p. 51, No. 969, 1797. 

 ? Aimisitim tcstitdinarium Bolten, Mus. Bolt., p. 165 (name only), 1798 ; 2'° Ausg., p. 115, 



1819. 

 Pecten inagellanicus Lam., An. s. Vert., vi., p. 165, 1819 ; ed. Desh., vii., p. 134, 1834; 



Gould, Inv. Mass., p. 132, 1842; ed. Binney, p. 196, fig. 494, 1870; Conr., Am. 



Mar. Conch., i., p. 6, pi. i., fig. i, 1831 ; Stm., Sh. N. Engl., p. 8, 1851. 

 Pecten fuscus Linsley, Am. Journ. Sci., 1st Ser., xlviii., p. 278, 1845 (name only); Gould, 



Am. Journ. Sci., 2d Ser., vi., p. 235, fig. 6, 1848; Stm., Sh. N. Engl., p. 8, 1851. 



(Young shell.) 

 Pecten brunneus, Stm., Sh. N. Engl., p. 58, in errata, 185 I. (Young.) 



