FREE INSTITUTE OF SCIENCE 



TERTIARY FAUNA OF FLORIDA 



haps 1 1 represent badly worn P. plirygiitin, while figs. 8 and 9 are taken 

 from the worn type of /'. glyptus. Perfect specimens of the latter are in the 

 National Museum and were figured as above cited in its Proceedings. It is 

 not yet known in the fossil state. 



Pecten (Chlamys) islaiidicus Miillcr. 

 I'l-i/iit is/iiiii/ifiis Miillcr, 1'roclr. X.ool. Dan., p. 248, 1776. 

 Os/i'i'ti ctnnabarina Horn, Test. Mus. Vinci., p. 103, 1780. 

 I',; ti-n nihiiius Martyn, Univ. Conch., No. 153, pi. 53, fig. I, 1784. 

 Os/iTti t/f/iiissii Solander, Mus. Calonn., p. 52, 1797. 

 I'ccli-n l\-ali-ii Conr. , Am. Mar. Conch., I, p. 12, pi. 2, fig. 2, 1831. 

 /'(//;/ l-\il>riiii 1'liil., Abb. uiul ]!eschr., iv., p. 3, pi. i, fig. 5, 1844. 



Chlaiiivs i<'*/cl/itta \'crr. and ISush, Trans. Conn. Acad., x., p. 75, 1897. (Very yninr. 

 shell.) 



Pleistocene of New England and New Brunswick and northward in the 

 bowlder clays, also on the North Pacific coasts in deposits of the same age ; 

 living from the Arctic waters southward to Chesapeake Bay. 



The minute shell described by Professor Verrill under the name of cos- 

 tcllata is less than five millimetres long and has not assumed the adult char- 

 acteristics. From an examination of the type I see no reason to doubt that 

 it is a very young specimen of the present species. This shell is the type of 

 the subgenus Clilamys. 



Pecten (Chlamys) Kneiskerni Conrad. 



J'fctt-n k'lu-iskcrni Conr., Am. Jotirn. Conch., v., p. 40, pi. I, fig. 18, 1869. 

 I'l'iU-n Knciski-rni WhittieUl, Lam., N. J., p. 224, pi. 29, fig. 5, 1885 ; in part. 



Eocene marl of Shark River, New Jersey, Conrad ; Jacksonian Eocene of 

 Claiborne, Alabama, and Enterprise, Mississippi, Johnson; Oligocene of the 

 Chipola beds, Monroe County, Florida (?), Burns. 



In Professor Whitfield's attempt to identify the cast of an immature shell 

 named as above by Conrad, the former has evidently brought together the 

 young, uncharacteristic shells of several species of Clilamys. Conrad's shell 

 was described as having thirteen ribs and none on the submargins ; Whitfield 

 gives the species fifteen to fifty ribs and radiated submargins. This is a range 

 altogether too great for a single species. Probably some of Professor Whit- 

 field's specimens were young choctaveusis, which has an unusually large 

 number of ribs. I have supposed a shell from the Jacksonian might represent 

 the unidentifiable species of Conrad. This has twenty-live ribs, divaricating 



