FREE INSTITUTE OF SCIENCE 



1059 



TERTIARY FAUNA OF FLORIDA 



Section Pctricolaria Stoliczka. Type P. pholadiformis Lam. 



Shell elongated, pholadiform, thin ; hinge-teeth protracted, slender ; pallial 

 sinus deep. 



Bernard is of the opinion that the nepionic shell in this group possesses 

 rudiments of three cardinals in both valves, but, in adolescent examples, I 

 have not been able to discover any trace of the supposed posterior right 

 cardinal. 



Petricola centenaria Conrad is an Asaphis; P. compressa H. C. Lea is a 

 Fabella or Sportella. It is stated that the P. carditoides Conrad of the Cali- 

 fornian recent fauna is also found in the Californian Pleistocene, but its 

 presence in earlier beds is yet to be established. 



Petricola lapicida Gmelin. 



Venus lapicida Gmelin, Syst. Nat., vi., p. 3269, 1792 (after Chemn. Conch. Cab., x., p. 



356, pi. 172, figs. 1664-1665, 1788) ; Wood, Ind. Test., pi. 8, fig. 72, 1825. 

 Venus divergens Gmelin, Syst. Nat., vi., p. 3269, 1792 (after Chemn. Conch. Cab., x., 



p. 357, pi. 172, figs. 1665-1666). 

 Petricola costata Lam., Syst. An. s. Vert., p. 121, 1801 ; Hanley, Descr. Cat. Rec. Sh., 



p. 53, 1843. 



Naranio costata Gray, Ann. Mag. Nat. Hist, xi., p. 38, 1853. 

 Narariio lapicida Deshayes, Cat. Conch. B. M., i., p. 216, 1853. 

 Petricola divaricata Orbigny, Moll. Cubana, ii., p. 265, 1853. 



Pliocene of the Caloosahatchie beds, Florida; Dall. Recent from South 

 Carolina southward throughout the Antilles and Caribbean region, boring 

 in coral. 



Immediately recognizable by the zigzag striation in the younger stages, 

 to which in the adult are added, on the posterior end, coarse radial ridges. 



Petricola (Rupellaria) typica Jonas. 



Choristodon typicum Jonas, Zeitschr. Mai., i., p. 185; Beitr. Molluskol., p. I, pi. 7, fig. 3, 



1844. 



Petricola lithophaga Arango, Moll. Cuba, p. 248, 1880; not of Retzius and Lamarck. 

 Choristodon robusta Dall, Bull. U. S. Nat. Mus., No. 37, p. 58, 1889; not of Sowerby. 



Pliocene of the Caloosahatchie beds, Florida; Dall. Recent in the An- 

 tillean region from Cape Florida southward. 



Shell radially ridged, the sculpture coarser behind. 



This and the preceding species appear to be rare in the Pliocene beds. 



