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TERTIARY FAUNA OF FLORIDA 



1'i'itt'ii tcnuicostatus Mighels and Adams, 1'roc. Host. Soc. N. Hist., i., p. 49, 1841 ; Host. 



Journ. Nat. Hist., iv., p. 41, pi. 4, fig. 7, 1842. (Young.) 



/;,/,// /i-iniiiw/iitii.'i Y i/mll, Rep. U. S. Fish. Com., 1871-2, pp. 509, 696, 1873. (Adult.) 

 Ciilii nivs (/'/irrryVi /</:) L'lintoiiiiis \'errill (c.r /<?//<), Trans. Conn. Acad. Sci., x., pp. 69, 



78, pi. xvii., figs. 1-7; pi. xx., figs. 7, 8, 8 a ; pi. xxi., figs. I, I a, 2, 2 <?, 1897. 

 J'ct/ii: (I'si-ititiiiiiiisinni) ' .Miillcri Yen-ill, of>. fit., p. "8, not of Dall. 

 I'd- ten (Pseudamusiunt) striatus Dall, Bull. U. S. Nat. Mus., No. 37, p. 34, No. 40, 1889 



(not of Miiller, fuic Yen-ill), young shell ; Verrill, op. fit., p. 96, in errata, 1897. 



Pleistocene of St. John, New Brunswick, and Gardiner's Island, New 

 York ; living from Labrador southward, in increasing depths of water, to 

 Cape Hatteras, North Carolina. 



The sculpture of the more northern specimens is less strong than in 

 those from more southern habitat, and for the former Professor Verrill suggests 

 the retention of Mighels's name taniicostatits (originally given to the young 

 shell) in a varietal sense. This is not P. tcnuicostatus Hupe, in Gay's Chile, 

 1854. As previously noted, the writer sees no reason why Gmelin's name, 

 given in error as to the true habitat of this species, but universally familiar, 

 should not continue to be used. If, however, an exaggerated purism demands 

 a change the next most appropriate name is that of Solander, given without 

 description in the Portland Catalogue, described in the Banksian MSS., and 

 cited by Humphrey as the Great Compass shell from Newfoundland, with 

 nearly equal valves, remarks which cannot possibly apply to any other species. 

 He not unnaturally places it after the species of Aniusium, as H. and A. 

 Adams did in their Genera of Recent Mollusca (ii., p. 55) sixty years later. 



Pecten (Placopecten) virginianus Conrad. 

 /',; /i-ii ^'ii-^iniiuuix Conr., Fos. Medial Tcrt., p. 46, pi. xxi., fig. 10, 1840. 



Miocene of City Point, Virginia; E. Ruffin. 



This is a puzzling shell, of which only the type specimen (a right valve) 

 and one oilier valve are known. It appears like a young shell of /'. Clintonins 

 in all essentials, except that it is more convex and has the byssal ear separated 

 by a broad fasciole and deep notch from the submargin and is provided with 

 a strong and conspicuous ctcnolium. The young shells of /'. Clintonms of the 

 same size (altitude fifty-eight millimetres) as the type of virginianus have not 

 these characters, as an examination of a large number has shown. A speci- 

 men of the same valve from Coggins Point, Virginia, identified by Conrad as 

 I'ii-giiiiainis, seems to me merely a young P. Clintonhis with a somewhat deeper 

 notch than usual, but the original type specimen differs more markedly, and 



