372 SYSTEMATIC PALEONTOLOGY 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 U. S. National Museum, Philadelphia Academy of Natural Sciences, 

 Cornell University. 



Dentalium danai Meyer. 



Plate LXIV, Pig. 4. 



Dentalium Danai Mej-er, 1885, Amer. Jour. Sci., ser. iii, voL xxix, p. 462. 

 Dentalium Danai Meyer, 1886, Ala. Geol. Survey, BulL 1, pt. li, p. 64, pi. iii, tigs. 



3, 3 a. 

 Dentalium Danai Dall, 1892, Trans. Wagner Free Inst. Sci., vol. iii, pt. ii, p. 439. 



Description. — "Smooth, section circular; smaller aperture with addi- 

 tional tube; margin distinctly notched on the convex side of the shell; 

 slightly emarginate on the concave side." Meyer, 1886. 



Length, 68 mm.; diameter. 4 mm. 



Occurrence. — Calvert Formation. Plum Point, Chesapeake Beach, 

 3 miles south of Chesapeake Beach, Truman's Wharf. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 U. S. National Museum, Cornell University. 



Dentalium caduloide Dall. 

 Plate LXIV, Figs. 5a, 5b. 



Dentalium caduloide Dall, 1893, Trans. Wagner Free Inst. Sci., vol. iii, pt. ii, p. 443, 

 pi. xxiii, fig. 35. 



Description. — " Shell small, thin, slightly curved, smooth but not 

 polished, marked only with incremental lines which cross the tube some- 

 what obliquely; shell cylindrical, posterior orifice small, circular, the 

 margin without notch or sulcus, rarely even perceptibly deviating from a 

 circle except when worn or chipped.'' Dall, 1892. 



Length, 13 mm.; diameter (maximum), 1.3 mm., (minimum) 0.5 mm. 



Occurrence. — St. Mary^s Formation. St. Mary's Eiver, Cove Point, 

 Langley's Bluff. Choptank Formation. Greensboro, Jones Wharf. 

 Calvert Formation. Plum Point. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 U. S. National Museum. 



