MAEYLAXD GEOLOGICAL SURVEY 299 



Length, 13.4 mm. ; height, 8 mm. ; diameter, 1.95 mm. 

 Occurrence. — Choptaxk Formation. Jones Wliarf. Calvert For- 

 mation. Plum Point. 



Collections. — U. S. National Museum, Maryland Geological Survey. 



Tellina (Angulus) producta Conrad. 

 Plate LXXII, Figs. 15, 16. 



Tellina producta Conrad, 1840, Fossils of the Medial Tertiary, p. 36, pi. xix, fig. 5. 

 Tellina (Peronoederma) producta Conrad, 1863, Proc. Acad. Nat. Sci. Pliila., vol. xiv, 



p. 573. 

 Tellina (Peroiueoderma) producta Meek, 1864, Smith. Misc. Coll. (183), p. 10. 

 Tellina {Angulus) producta Dall, 1900, Trans. Wagner Free Inst. Sci., vol. iii, pt. v, 



p. 1029. 

 MacOma (Psammacoma ?) producta Dall, 1900, Trans. Wagner Free Inst. Sci., vol. 



iii, pt. V, p. 1054. 



Description. — " Shell narrow-elliptical, compressed ; posterior side 

 pointed, extremity obtuse; fold submarginal, obscure; basal margin 

 straight opposite the beak ; lateral teeth none." Conrad, 1810. 



Anterior dorsal margin is more nearly parallel to the base than in 

 A. declivis and posterior portion is more produced, posterior dorsal mar- 

 gin being less declining. 



Length, 11 mm.; height, 6.4 mm.; diameter, 1.4 mm. 



Occurrence. — St. Mart's Formation. Cjove Point, St. Mary's Eiver 

 (Meek; fide Dall). Calvert Formation. Plum Point, Blake's (fide 

 Dall). 



Collections. — U. S. National Museum, Maryland Geological Survey. 



Tellina (Angulus) dupliniana Dall. 

 Plate LXXIII, Fig. 1. 



Tellina (Angulus) dupliniana Dall, 1900, Trans. Wagner Free Inst. Sci., vol. iii, 

 pt. v, p. 1032, pi. xlvi, fig. 17. 



Description. — " Shell small, solid, rather convex, inequilateral, dorsal 

 margins rectilinear, diverging at an angle of about one hundred and eight 

 degrees, anterior end longer, rounded evenly into the base, which is nearly 

 parallel with the anterior dorsal margin; posterior end much shorter, 

 pointed, the terminal angle slightly decumbent and the basal margin in 

 front of it slightly incurved ; beaks inconspicuous, hinge normal, the right 



