270 



Bulletin 39 



Section BOTHROCORBULA, Gabb 



Corbula vimlnea Guppy Plate 28, figure 25 



Corbula viniinea Guppy, 1866, Quart. Journ. Geol. Soc. London, vol. 



22, p. 293, pi. 28, fig. II. 

 Bothrocorbula viminea Gabb, 1873, Trans. Amer. Phil. Soc, vol. 15 



p. 247. 



Corbula {Bothrocorbula) vimineaT>s.\\, 1898, Trans. Wagner Free Inst. 



Sci., vol. 3, pt. 4, p. 850. 

 Corbula {Bothrocorbula) viminea Maury, 1917, Bull. Amer. Pal., vol. 



5, P- 397, pl- 39. figs. 20, 21. 



This is a very characteristic species, distinguished by its 

 large, deep lunule and its surface strongl}^ sculptured with 

 coarse, concentric, wave-like costae. It is known from the Mio- 

 cene of Jamaica and Santo Domingo. 



The Corbula hexacyma Brown and Pilsbry, still known on- 

 ly from the Gatun of the Canal Zone is similiar in form and 

 sculpture but lacks the deep lunular pit. 



Length 15, height 10, semi-diameter 4.85 mm (right 

 valve). 



Gatu7i Stage: Middle creek. 



