TRANSACTIONS OF WAGNER 

 1096 



TERTIARY FAUNA OF FLORIDA 



which is obscure on the summits but on their edges stands out at regular 

 intervals at right angles to the ribs, giving a remarkable articulated appear- 

 ance to them ; the six ribs of the posterior area are asymmetrically appressed 

 and are exempt from the tsenia-like structure; hinge normal, strong, with a 

 well-marked pseudolunule above the anterior part of it. Lon. 35, alt. 30, diam. 

 23 mm. 



The very remarkable sculpture of this species would enable one to recog- 

 nize even a small fragment of it, but the ribs are hollow and the substance of 

 the shell of a spongy character, lending itself to solution or erosion, and the 

 specimens obtained are all extremely dilapidated. 



Cardium ( Cerastoderma ) cilia turn Fabricius. 



Cardium ciliatum O. Fabricius, Fauna Gronl., p. 410, 1780. 



Cardium islandicum Chemnitz, Conch. Cab., vi., pp. 146, 200, pi. 19, figs. 195, 196, 1782 ; 

 Spengler, Mag. Ges. Naturf. Freunde zu Berlin, ii., p. 121, 1808; Wood, Gen. Conch., 

 p. 225, pi. Iv., figs. 2, 3, 1815 ; Index Test, p. 26, pi. v., fig. 27, 1825 ; Gould, Rep. Inv. 

 Mass., p. 89, fig. 58, 1841 ; De Kay, Zool. N. York, v., p. 206, pi. xxiii., fig. 252, 1843 ; 

 Mighels, Boston Journ. Nat. Hist., iv., p. 321, 1843 ; Reeve, Conch. Icon., ii., Car- 

 dium, pi. xi., fig. 54, 1844; Stimpson, Shells of N. Eng., p. 19, 1851. 



Cardium edule Mohr. Isl. Naturli., p. 128, 1786; not of Linne. 



Cardium pubescens Couthouy, Boston Journ. Nat. Hist., ii., p. 61, pi. iii., fig. 6, 1838. 



Cardium arcticum Sowerby, P. Z. S., 1840, p. 106; Conch. 111., i., pi. 51, fig. 26, 1841. 



Cardium Dazvsoni Stimpson, Proc. Acad. Nat. Sci. Phila. for 1862, p. 58, figure. 



Cardium Haycsii Stimpson, Proc. Acad. Nat. Sci. Phila. for 1863, p. 142, 1863. 



Cardium (Cerastoderma) ciliatum Morch, Yoldi Cat., ii., p. 34, 1853. 



Cardium (Serripes) islandicum H. and A. Adams, Gen. Rec. Moll., ii., p. 456, 1857. 



?Cardium boreale Broderip and Sowerby, Zool. Journ., iv., p. 368, 1829. 



Pleistocene of the post-glacial silts and bowlder clays of the entire boreal 

 region; recent, from the Arctic seas southward to Cape Cod on the Atlantic 

 and to Puget Sound on the Pacific coast. 



This well-known species is one of the most characteristic shells of the 

 cold-water Pleistocene throughout the northern hemisphere. It is curious 

 that the typical form figured by Chemnitz should have been the one Stimpson 

 was led to separate from the other varieties as a distinct species under the 

 name of Hayesii. The C. boreale of Broderip and Sowerby is perhaps the 

 same as C. blandnm Gould, but it has not been figured and the description is 

 insufficient to certainly identify the shell. It is certainly either blanduin or 

 the present species. 



Tryon, curiously enough, refers this species to Linne under the name 



