TRANSACTIONS OF WAGNER 

 664 



TERTIARY FAUNA OF FLORIDA 



Pinna ramulosa Reeve, op. cit., xxviii., fig. 52, 1858. 



Pinna seminiida Holmes, P. -PL Fos. S. Car., p. 14, pi. iii., fig. 3, 1858. 



Pinna muricata of American authors, not Linne or Reeve. 



Post Pliocene of Simmons Bluff, South Carolina, Holmes; of Charlotte 

 Harbor, Florida, Dall ; recent from the vicinity of Cape Fear, North Carolina, 

 through the Antillean and Caribbean region, the eastern coast of Central 

 America, and the northern shore of South'America. 



The variations of the Pinnidce in connection with their station have been 

 insufficiently taken into account, probably because these rough and fragile 

 shells are unattractive to collectors and rarely gathered in any numbers. If 

 the ground on which they live is hard and stony the shells will be short and 

 wide, with coarse, irregular spines and distorted margins. On soft bottom 

 the shells are more elongate and may be spiny or nearly smooth ; on fine, 

 clean sand the spinous processes are often beautifully developed and per- 

 fectly preserved. The young have a smaller number of dorsal radii which 

 may or may not be spiny, the ventral area is generally nearly smooth, while 

 the same individuals, when full grown, will have a profusion of small ridges 

 and minor spines upon them in this area. In clear, still water, especially on 

 sandy bottom, the tubulation of the spines seeins to become especially 

 marked. Such a specimen formed the type of Reeve's P. ramulosa. P. alia 

 Sovverby was founded on a finely grown specimen with shorter spines, and 

 the figure of Chemnitz upon which P. rigida Dillwyn and seniiniida Lamarck 

 were founded is derived from an adolescent shell, as is d' Orbignyi Hanley. 

 P. subvhidis Reeve is an old, worn specimen, and P. carolinensis the normal 

 adult state. The P. muricata of Linne included several types. That upon 

 which the name has finally been fixed is a true Pinna, and not an Atrina. 



Atrina serrata Sowerljy. 

 Pinna serrata Sby., Tank. Cat. App., p. v., 1825 ; Genera, fig. I ; Reeve, Conch. Icon., 



Pintia, xxxiv., fig. 65, 1859. 

 Pinna squamosissima Phil., in Roemer's Texas, p. 454, 1849 ; Hanley, P. Z. S., 1858, p. 



226 ; Phil. Zeitsch. Mai., v., p. 164. 

 Pinna scniinuda Reeve, Conch. Icon., Pinna, ii., fig. 2, 1858 ; not of Lamarck. 

 Pinna nniricata Holmes, P.-Pl. Fos. S. Car., p. 15, pi. iii., fig. 3, 1858 ; not of Linne. 



Pliocene of Costa Rica, Gabb; Post Pliocene of Simmons Bluff and 

 Abbapoola, South Carolina, Holmes ; of Tampa and Little Sarasota Bays, 

 west Florida, Dall ; recent from near Cape Hatteras, North Carolina, to the 

 Caribbean Sea (Guadelupe Island.). 



