208 SYSTEMATIC PALEONTOLOGY 



Colus quadricostatus Tuomey and Holmes, 1857, Pleiocene Fossils of South Caro- 

 lina, p. 149, pi. XXX, fig 4. 



Fusus quadricostatus Emmons, 1858, Kept. N. Car. Geol. Survey, p. 250, fig. 10. 



Ecphora quadricostala Conrad, ISol, Fossils of the Medial Tertiary, No. 4, p. 83, 

 pi. xlviii, fig. 3. 



Ecphora i-costatus Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, p. 563. 



Ecphora quadricostata Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 30. 



Rapana quadricostata Tryon, 1883, Manual of Conchology, vol. iv, p. 203, pi. Ixii. 

 fig. 341. 



Ecphora quadricostata Dall, 1890, Trans. Wagner Free Inst. Sci., vol. iii, pt. i, p. 135. 



Ecphora qnaclricostata Harris, 1893, Amer. Jour. Sci., ser. iii, vol. xlv, p. 38. (Not 

 pp. 34, 37.) 



Bapana (Ecphora) quadricosta Cossmann, 1903, Essais de Paleoconch. Comp., vol. v, 

 p. 64, pi. iii, tig. 14. 



Description. — " Ovate-ventricose; with a dilated umbilicus, and four 

 much elevated belts, which are more dilated at their tops. 



"Spire short, the volutions with but two belts, the others being con- 

 cealed by the succeeding whorls : body whorl with four belts, which are 

 equidistant, much elevated, wider at top than at the junction with the 

 whorl, and with one or two deeply impressed lines; intervening spaces 

 wrinkled, the wrinkles extending over the belts : aperture suboval : catial 

 short and contracted : Idbrum with a groove corresponding with each of 

 the exterior ribs: umhilicus dilated, large, not visibly penetrating to the 

 inner summit; the exterior margin prominent and deeply dentated." 

 Say, 1824. 



The essential characters of this species as here restricted are: four re- 

 volving costge, which in the adult are of equal prominence and T-shaped 

 in cross section. The adult is more depressed than the young, and with 

 this depression comes the flattening of the costse, the flaring of the um- 

 bilicus, and a looser coiling of the whorls. 



This species is apparently the only one at Cove Point and St. Mary's 

 Eiver and in the states south of ]\Iaryland. It has not been found at 

 other Maryland localities than those mentioned above. Tuomey and 

 Holmes' figure is so imperfect that it is impossible to state whether it rep- 

 resents the typical form of the species or the following variety. 



Length, 120 mm. ; diameter, 105 mm. 



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



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 U. S. ISTational Museum, Philadelphia Academy of Natural Sciences, Cor- 

 nell University. 



