202 SYSTEMATIC PALEONTOLOGY 



Description.- — " V. testa cordata solida transverse substriata lsevi, mar- 

 gine crenulate, intus violacea, ano ovata." Linne, 1758. 



This widespread species is very common in the Maryland Pleistocene. 

 It is found widely in the Miocene of the Atlantic Coast from Massachu- 

 setts (G-ay Head) to Florida, in the Pliocene of the Carolinas and Florida, 

 and in the Pleistocene from Massachusetts to South Carolina. It ranges 

 in the Eecent from the Gulf of St. Lawrence to the Florida Keys and 

 westward to Texas. 



Width, 137 mm.; height, 117 mm.; thickness, 76 mm. 



Occurrence. — Talbot Formation. Wailes Bluff near Cornfield Har- 

 bor, St. Mary's County. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 and IT. S. National Museum. 



Superfamily LEPTONACEA 

 Family LEPTONIDAE. 



Genus ALIGENA H. C. Lea. 

 Aligena elevata (Stimpson). 



Plate LX, Figs. 1-4. 



Montacuta elevata Stimpson, 1851, Shells of New England, p. 16. 

 Tellimya elevata Dall, 1889, Bull. U. S. Nat. Mus., No. 37, p. 50, pi. lxviii, 



fig. 6. 

 Aligena elevata Dall, 1900, Trans. Wagner Free Inst. ScL, vol. iii, pt. v, 



p. 1177. 



Description.— This species was referred by Gould to M. bidentata Angl. 

 Stimpson, who described the species in 1851, states: "It differs from 

 M. bidentata in the position of the beaks, and in its proportions." 



This species has been found in the Pleistocene of Massachusetts (Pt. 

 Shirley) and of Maryland, and in the Eecent is chiefly confined to the 

 coast between Cape Cod and New Jersey. 



Width, 3 mm.; height, 2.5 mm. 



Occurrence. — Talbot Formation. Wailes Bluff near Cornfield Har- 

 bor. St. Mary's County. 



Chi lections. — Maryland Geological Survey, Johns Hopkins University, 

 and TJ. S. National Museum. 



