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699 

 TERTIARY FAUNA OF FLORIDA 



Pecten burdigalensis Lam. (regarded by Deshayes as a variety of the 

 species cristatiis Bronn, referred to Amusmm by Sacco) is made type of a sub- 

 genus of typical Pecten called Amussiopectcn by Sacco, and the subgenera 

 Oopecten Sacco, based on Pecten rotiindatus Lam., and Flabcllipcctcn Sacco, on 

 P. fiabcllifonnis Brocchi, are also referred to typical Pecten. If differential 

 descriptions of new groups were imperative, probably some of the above 

 might never have seen the light, but, with present methods, the flood of new 

 names is lilcely to continue unchecked by any considerations drawn from a 

 serious study of nature. 

 Subgenus Hinnitcs Defrance, 1821. Type H. Cortczi Defr. 



Shell (up to advanced youth) a typical Chlamys, later becoming sessile 

 and irregular, in which stage the resilial pit is elongated and the cardinal 

 margin develops an obscure area. Hinuita Gray is synonymous. 



There are several groups of Pectinidcz in Paleozoic and Mesozoic horizons, 

 as well as one or two exotic recent types, which do not need to be considered 

 here. 



FOSSIL PECTENS OF THE PACIFIC COAST. 

 Since it became absolutely necessary to review the Pacific coast and 

 Antillean Pectinidce in order to settle the status of those of the Atlantic coast, 

 and as this review has necessitated a good deal of hard work, and the results 

 may be useful to the student, a synopsis of them is offered here. 



Pecten (Patinopecten) propatulus Conrad. 

 Pecten propatulus Conrad, Geol. Wilkes Expl. Exped., App. i, p. 726, pi. 18, figs. 13, 



i3«, 1849. 

 Pecten caurinus of various authors, but not of Gould. 



Astoria Miocene of the Columbia River; Dana. 



The types of this species are in the National Museum. It has been 

 regarded as identical with P. caurinus Gould by Carpenter, Cooper, and others, 

 but, as pointed out by Meek (Miocene Checkhst, S. I. Misc. Coll., p. 26, 1864), 

 while the recent shell has from twenty to twenty-six ribs and a minutely con- 

 centrically striated surface, the P. propatulus rarely has more than sixteen 

 ribs, and when perfect has the surface microscopically tessellated. The latter 

 is also a generally smaller and more convex species. 



Pecten (Patinopecten) Meekii Conrad. 

 Pecten Meetsii Conr., Pac. R. R. Rep., vii., p. 190, pi. i, fig. i, 1857. 

 Miocene of San Rafael, California; Conrad. 



