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609 



TERTIARY FAUNA OF FLORIDA 



Pec ten burdigalsnsis Lam. (regarded by Dcshayes as a variety of the 

 species cnstatns Bronn, referred to Aiiiiisinm by Sacco) is made type of a sub- 

 genus of typical Pcctcti called Anmssiopectcn by Sacco, and the subgcncra 

 Oopecten Sacco, based on Pectin rotundatns Lam., and Flabellipecten Sacco, on 

 /'. fJal'illiforuns Brocchi, are also referred to typical Pcctcn. 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 likely to continue unchecked by any considerations drawn from a 

 serious study of nature. 



Subgenus Hinnitcs Defrance, 1821. Type //. 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. Hinnita Gray is synonymous. 



There are several groups of Pcctiiiidic 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 

 Antillcan Pcctinidce 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. 



"ft Pecten (Patinopecten) propatulus Conrad. 

 /'</<;/ pntpalulits Conrad, Cecil. \Vilkes Kxpl. Kxped., App. I, p. 726, pi. 18, figs. 13, 



13 a, 1849. 

 J't-ctrn caiirinus 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 Checklist, 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. propalnlits 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. 

 /'(A-;/ .)/(</// Com ., I'ac. K. K. Ui'p., vii., p. 190, pi. I, fig. I, 1857. 



Miocene of San Rafael, California; Conrad. 



