TRANSACTIONS OF WAGNER 

 664 



TERTIARY FAUNA OF FLORIDA 



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



I'iiuia st-iiiiniiila Holmes, P. -PI. Fos. S. Car., p. 14, pi. iii., fig. 2, 1858. 



Pinna mitricata of American authors, not Linne or Reeve. 



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

 Harbor, Florida, Ball ; 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 Pinnidte 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 seems to become especially 

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

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

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

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

 P. subviridis Reeve is an old, worn specimen, and P. caroliiiensis the normal 

 adult state. The P. nniricata of Linnc included several types. That upon 

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



Atrina serrata Sowerby. 

 Pinna scrrata Shy., Tank. Cat. App., p. v., 1825 ; (icnera, fig. I ; Reeve, Clinch. Icon., 



Pinna, xxxiv., fig. 65, 1859. 

 Pinna mfitaiiiosissiiiia Phil., in Roemer's Texas, p. 454, 1849; Ilanley, P. /.. S., 1858, p. 



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



Pinna st'iiiiiunlti Reeve, Conch. Icon., Pinna, ii., fig. 2, 1858 ; not of Lamarck. 

 Pinna nniiiiala Holmes, P. -PI. Fos. S. Car., p. 15, pi. iii., fig. 3, 1858 ; not of Linnc. 



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 Ilatteras, North Carolina, to the 

 Caribbean Sea (Guadelupe Island.). 



