30 POST-PLEIOCENE FOSSILS. 



it can only be distinguished by the radiating lines which give the shell a cancellated 

 appearance. 



It occurs in the Post-Pleiocene, and is often confounded with L. crenulata. 



Plate VI. Fig. 6, Natural size. 



Locality. Simmons', Wadmalaw Sound. 



Museum, College of Charleston ; Cabinet F. S. H. 



LUCINA CRENULATA.- (Not figured.) 



Lucina crenulata, Con., Foss. Ter. For., p. 39, pi. 20, fig. 2. 



Lucina crenulata, Tuomey $ Holmes, Pleiocene Foss. So. Ca., p. 60. pi. 18, figs. 14 and 15. 



Description. Shell orbicular, inflated, concentrically lamellated; lunule slightly 

 excavated. 



This little species is readily distinguished by its orbicular outline and the closely 

 arranged concentric lamellae ; the lunule is short and deep. It is distinguished from L. 

 multiline ata, which it resembles, by the absence of radiating lines. It is quite common 

 in the Meiocene of Virginia, and is living along the coast from the Chesapeake to 

 Florida.— T. $ H. 



Locality. Abbapoola. Museum, College of Charleston; Cabinet F. S. H. 



Genus, MONTACUTA.— Turt. 



MONTACUTA BOWMAN I.— (New Species.) 

 Plate VII. Fig. 2. 



Description. Shell small, fragile, ovate-triangular, inequilateral, slightly compressed, 

 concentrically and finely striated in bands of yellow and white ; beaks very small, acute ; 

 buccal and anal margins regularly rounded ; tooth on the buccal side excavated ; two teeth 

 in each valve ; cavity between them for the ligament. 



This little shell corresponds somewhat with Gould's description of Montacuta 

 bidentata, which is living on the coast of Massachusetts, but differs in size and general 

 outline ; and, what is most characteristic, the alternate opake and translucent concentric 

 bands on the surface. It does not exist on the coast of South-Carolina. 



