MARYLAXD GEOLOGICAL SURVEY 273 



Genus CADULUS Philippi. 



Cadulus thallus (Conrad). 



Plate LXIV, Fig. 6. 



JJentalium thallus Conrad, 1834, Jour. Acad. Nat. Sci. Phila., voL vii, 1st sen, 



p. 14--i. 

 Benialium thallus Conrad, 1845, Fossils of the Medial Tertiary, No. 3, p. 78, pi. 



xliv, fig. 5. 

 Bentalium thalhcs H. C. Lea, 1845, Trans. Amer. Philos. Soc., vol. ix, p. 230. 

 Dentalimn thallus Tuomey and Holmes, 1857, Pleiocene Fossils of South Carolina, 



p. 106, pi. xsv, fig. 8. 

 Bentalium thallus Emmons, 1858, Rej)t. N. Car. Geo!. Survey, p. 274, fig. 190. 

 Bentalium thallus Conrad, 1863, Proc. Acad: Nat. Sci. Phila., vol. xiv, p. 570. 

 Bentalium ? thallus Meek, 1864, Miocene Checli List, Smith. Misc. Coll. (183), p. 14. 

 Cadulus thallus Dall, 1892, Trans. Wagner Free Inst. Sci., vol. iii, pt. ii, p. 445. 



Description. — " Shell slightly curved, smooth, highly polished ; swell- 

 ing below the middle; aperture very regularly oval." Conrad, 1834. 



" Subulate, slightly curved, smooth, polished, tumid below the middle." 

 Conrad, 1845. 



Length, 7 mm.; diameter, 1.5 mm. 



Occurrence. — St. Marty's Formation. Qo\q Point. Choptank 

 Formation. Dover Bridge, Pawpaw Point, Peach Blossom Creek, 

 Greensboro, Governor Kun (lower bed), Trappe Landing, Jones Wharf. 

 Calvert Formation. Plum Point, 3 miles south of Chesapeake Beach, 

 Eeed's. 



Collections. — Maryland Geological Survey, Johns Hopkins Universitj^, 

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

 Cornell University. 



Cadulus newtonensis Meyer and Aldrich. 

 Plate LXIV, Fig. 7. 



Cadulus Newtonensis Meyer and Aldrich, 1886, Cin. Jour. Nat. Hist., vol. ix, No. 2, 



p. 40, pi. ii, figs. 3a, ob. 

 Cadulus newtonensis Dall, 1892, Trans. Wagner Free Inst. Sci., vol. iii, pt. ii, p. 444. 



Description. — " Two depressed fragments from Newton show an aper- 

 ture which is different from the other known apertures of Cadulus of the 

 Southern Eocene. Two distant deep notches on the convex side, and two 

 less distant emarginations on the concave side of the shell divide the 

 18 



