TRANSACTIONS OF WAGNER 



1370 



TERTIARY FAUNA OF FLORIDA 



577, 1863 ; Meek, S. I. Checkl. Mioc. Fos., p. 8, 1865 ; Heilprin, Proc. Acad. Nat. Sci. 



Phila. for 1887, pp. 400, 403. 

 Lucina multistriata Conrad, Proc. Acad. Nat. Sci. Phila., i., p. 307, 1843 ; Fos. Medial 



Tert, p. 71, pi. xl., fig. 6, 1845. 

 Codakia multistriata Conrad, Proc. Acad. Nat. Sci. Phila. for 1862, p. 577, 1863. 

 f Lucina trisulcata Whitfield, Mioc. Moll. N. Jersey, p. 64, pi. x., figs. 1-4, 1895 ; Mon. 



U. S. Geol. Survey No. xxiv. 



Upper Oligocene to the Pliocene ; recent ? 



P. trisulcatus variety Whitfleldi Dall. 

 Upper Oligocene of the Oak Grove sands at Oak Grove, Santa Rosa County, 

 Florida, and lower Miocene of the artesian well at Atlantic City, Whitfield ; 

 Pliocene of the Waccamaw district, South Carolina, Johnson. 



P. trisulcatus variety trisulcatus Conrad. 

 Miocene of the Natural Well and Magnolia, Duplin County, North Caro- 

 lina, Conrad and Burns ; Pliocene of the Caloosahatchie and Shell Creek ; re- 

 cent ? 



P. trisulcatus variety multistriatus Conrad. 



Miocene of Wilmington, North Carolina, Conrad, and of the Duplin Natural 

 Well, Burns. 



The first variety is broader, rather flatter, larger, and with fewer resting 

 stages and stouter hinge. The second has more pronounced and numerous 

 resting stages, the sculpture between them being rounded over like broad con- 

 centric ribs, the shell being smaller, narrower, and with more pointed beaks. 

 Variety multistriatus has feeble and obsolete radial striation and the general 

 form of variety WhitHeldi. The first has been figured by Whitfield, the others 

 by Conrad and others. 



Were the characters of these shells at all constant they would properly be 

 regarded as species, but they appear to vary exceedingly, and analogous varia- 

 tions, quite as marked, may be observed in a sufficiently extended geographical 

 series of the recent shell which goes under Conrad's name. I confess that I am 

 unable to separate the various forms from each other specifically, and feel 

 obliged to regard them as mutations of an extremely variable polymorphic 

 species. The variety multistriatus is not Lucina multilineata of Tuomey and 

 Holmes, as stated by Conrad in the " Proceedings of the Academy of Natural 

 Sciences for 1862," p. 577, the latter being a Parvilucina. 



