MARYLAND GEOLOGICAL SURVEY 245 



cality and the original description clearly show that this is a Calvert and 

 Choptank form and very distinct from the St. Mary's form, which all 

 later authors and probably Say himself regarded as identical with it. 



Height, 21 mm.; length, 43 mm.; width, 33 mm. 



Occurrence. — Choptank Formation. Jones Wharf, Governor Run, 

 2 miles south of Governor Run, Flag Pond, Peach Blossom Creek, Cor- 

 dova, Sand Hill, St. Leonard Creek. Calvert Formation. Plum 

 Point, Chesapeake Beach, Church Hill, 3 miles west of Centerville, Wye 

 Mills. 



Collections. — Maryland Geological Survey, Johns Hopkins Universit}', 

 IT. S. National Museum. 



Crucibulum cosTAiuM VAR. piLEOLUM (H. C. Lea). 

 Plate LVIII, Figs. 8a, 8b, 9a, 9b, 10. 



DispoUea costata Conrad, 1842, Proc. Nat. Inst., Bull ii, p. 187. 



Calyptrcea pileolus H. C. Lea, 1843, New Fossil Shells from the Tertiary of Virginia, 



Abst. p. 6. 

 Galyptrcea Pileolus H. C. Lea, 1845, Trans. Amer. Philos. Soc., vol. i.v, p. 248, pi. 



xxxT, fig. 38. 

 DispoUea costata Conrad, 1845, Fossils of the Medial Tertiary, No. o, p. 7".t, pi. xlv, 



fig. 2. 

 Crucibulum costatuni Conrad, 1863, Proc. Acad. Nat. Sci. Pliila., vol. xiv, p. 568. 

 Crucibulum costatum Meek, 1804, Miocene Check List, Smith. Misc. Coll. (183), p. 15. 

 Critcihuhim auricula var. costatum Dall, 1892, Trans. Wagner Free Inst. Sci., vol. 



iii, pt. ii, p. 349. 



Description. — " Shell irregularly conical, thick, sulcate ; sulci radiat- 

 ing, large, irregular ; concentric strise mmute, small ; apex smooth, twisted 

 into two whorls; aperture sub-rotund; cyathus large, wide, angular." 

 H. C. Lea, 1845. 



" Somewhat conical, with profound irregular ribs, and very coarse con- 

 centric wrinkles ; apex not central, prominent, obliquely inclined, margin 

 profoundly scalloped; diaphragm ovate, profound, the margins free." 

 Conrad, 1845. 



This variety includes all the strongly costate forms with a cup free at 

 the periphery in the adult. 



Height, 25 mm. ; length, 50 mm. ; width, 42 mm. 



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

 Langley's Bluff. 



