FREE INSTITUTE OF SCIENCE 



831 



TERTIARY KAUNA OF FLORIDA 



name udnipta for a Panopea in 1843, the specific name of cxtrellana would 

 best be retained for this Miocene fossil of Oregon and California. The latter, 

 however, seems entirely distinct from the P. gcnerosa, being a smaller, more 

 slender, and more equilateral species. The latter has several varieties which 

 are so market! in form that it is perhaps best to assign them varietal names. 



Panopea generosa Gould, typical form. t - 



Shell rather thin, nearly equilateral, the beaks slightly anterior, the dorsal 

 and ventral margins in the full-grown shell parallel and nearly straight, the 

 pedal margin evenly rounded, the nymph narrow, and the attached edge of 

 the ligament very short, the pallial sinus wide and shallow. Lon. 182, alt. 

 1 10, diam. 60 mm. Puget Sound. 



Panopea (var.) solida Dall. 



Shell heavy, somewhat arcuate, the pedal region slightly obliquely trun- 

 cated, the nymph strong, and the ligamentary attachment twice as long as in 

 the typical form, the pallial sinus deeper. Lon. 177, alt. 97, diam. 62 mm. 

 San Francisco, California. 



l\inopea (var.) globosa Dall. 



Shell thin, short, inflated, the beaks nearer the anterior end, which is 

 expanded and rounded in the pedal region ; posterior end narrower, opposite 

 margins not parallel ; posterior hiatus smaller than in the type and somewhat 

 recurved ; nymph narrow, slender, somewhat longer than in the type ; pallial 

 sinus small, wide. Lon. 160, alt. 120, diam. 80 mm. Head of the Gulf of 

 California; Palmer. 



The last variety is only known from the locality cited, the other two are 

 found from Pugct Sound to San Diego, California. 



Panopea floridana Hcilprin. 



r.Jloritiaiiii Hcilprin, 'Trans. Wanner Inst., i., p. 91, pi. 10, fig. 21, 1887. 

 /'. .\/,'iuinfi Hcilprin, op. fit., p. 90, pi. 9, fig. 19, 1887 ; not of Deshayes. 

 /'. ntniifiilti Hcilprin, op. n't., p. 91, pi. 10, fig. 22, 1887. 



Pliocene of the Caloosahatchie beds, on the Caloosahatchie, Shell Creek, 

 and Alligator Creek, Florida ; Dall and Willcox. Recent at Cape Lookout, 

 North Carolina, Bickmore ; and at Mobile Point, Mississippi, Conrad. 



The form referred to Meiiardi by Jleilprin is a distinct species from 

 that and from the American Miocene forms usually called rcflc.va Say. In the 

 writer's opinion there is but one species of Panopea in the Florida Pliocene, 



