MARYLAND GEOLOGICAL SURVEY 269 



Height, 19 mm. ; lengtJi, -iS mm. ; width, 3-i mm. 



Occurrence. — St. Mary's Formation ( ?). "St. Mary's Eiver" (fide 

 Conrad). Choptank Formation. Jones Wharf, Governor Eun, 2 

 miles south of Governor Eun, Greensboro, Dover Bridge. 



Collections. — Maryland Geological Survey, Johns Hopkins University. 



Fissuridea redimicula (Say). 

 Plate LXIIl, Fig. 6. 



Fismrella redimicula Say, 1834, Jour. Acad. Nat. Sci. Phila., vol. iv, 1st ser., p. 133, 



pi. viii, fig. 1. (Reprint, 1896, Bull. Amer. Pal., No. 5.) 

 Fissurella redimicula Conrad, 18-45, Fossils of the Medial Tertiary, No. 3, p. 78. 

 Not Fissurella redimicula Tuomey and Holmes, 18.56, Pleiocene Fossils of South 



Carolina, p. 113, pi. xxv, fig. 14. 

 Fissm-ella redimicula Emmons, 1858, Rept. N. Car. Geo). Survey, p. 377, fig. 196. 

 Fissurella redimicula Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, p. 570. 

 Fissurella redimicula Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 14. 

 Fissuridea redimicula Dall, 1893, Trans. Wagner Free Inst. Sci., vol. iii, pt. ii, 



p. 435. 



Description. — " Ovate-oval a little oblong, conic-convex, with approxi- 

 mate longitudinal striae; foramen ovate-oval, inclined. 



"Longitudinal striae slender, numerous, granulated, approximate; the 

 granulations of the stri« give the appearance of concentric obsolete lines : 

 aperture, inner margin crenate; thickened inner margin of the foramen 

 truncate at one end." Say, 1S?4. 



The typical form of this species, with uniform sculpture is not authen- 

 tically known from Maryland, although the type is supposed to have come 

 from the St. Mary's Eiver. Possibly F. alticosta Conrad should be 

 considered a variety or a synonym of this species. 



Occurrence. — St. Mary's Formation. St. Mary's Eiver. 



Collection. — British Museum. 



Genus EMARGINULA Lamarck. 



Emarginula marylandica n. sp. 



Plate LXIII, Figs. 7a, 7b. 



Description. — Shell small, moderately thick, depressed; apex slightly 

 posterior to the center; base oval; anterior slope broadly and regularly 

 convex; posterior slope shorter, strongly concave above, straight for the 



