.AI.\T?YI,.\\I) (!i:<)l.()(iic \|, SIRVKY 201 



NuctildiKi jinilr.rlii ('(iiiiiid (ISC..")), wliich is Ledn protcrld lliirris 

 (189T), iiicliuk's I wo rorm.s. Tho iirst lias been (]eseril)e(l by Dr. Dall 

 as Lechi plidrridd jiiid ocouri^ nt Wood's Bluff, Choctaw Corner, and Cave 

 Branch, Ala. The sccdiid. whidi is Leda prolexla Clark (189G), is 

 described hero, and occin-s outside ol' .Mar\ land at I'xdl's Lamlin;^, Gregg's 

 Landing-, and Yellow Jiliill', Ala. 'I'lir alinvc Idealities are all given 

 from niatei'ial in llie (■dllcei i<Mi nF the I'liiladelphia .\cadcniv of Xatnral 

 Seieiiees. 



Loiiii'th, 37 mm.; width, K mm. 



Occurrence. — Xaxjemoy FoiniATiox. "Woodstock, West of Port To- 

 bacco, 1 mile southeast of Piscataway, ^ mile below Chapel Point, 

 Charles Branch between Eosaryville and Upper Marlboro, Popes Creek. 



Collections. — Johns Hopkins University, Maryland Geological Survey. 



Leda cliftonensis n. sp. 

 Plate LVI, Fig. 11. 



Description. — Shell short, ventricose, posteriorly acute, anterior regu- 

 larly rounded. Surface marked with very regular, concentric folds, 

 with narrow, sharply incised interspaces. 



Length, 11 mm.; height, 5 mm. 



Occurrence. — iVQUiA Foematiox. 2 miles below Potomac Creek, Po- 

 tomac Creek, xAquia Creek, Liverpool Point, Clifton Beach. 



Collection. — Maryland Geological Survey. 



Leda tysox^i n. sp. 

 Plate LA'II, Figs. 4, 4a, 5. 



Description. — Shell of moderate size, thin, not extremely inequilateral; 

 beaks large, i^roximate; anterior end produced, uniformly rounded; pos- 

 terior end broad, uniformly rounded; surface marked by tine, regular 

 closely-set rounded lamellae Avith narrow interspaces; hinge-line nearly 

 straight with from twelve to iifteen teeth on either side of a subum- 

 bonal chondrophore. 



This species has some resemblance to the figures of Xucula capsiopsis 

 de Gregorio.^ 



'Ann. Geol. et Pal., vol. ii, p. 187, pi. xxii, flgs. 23, 2i. 



