MARYLAND GEOLOGICAL SURVEY 131 



Class GASTEROPODA. 



Subclass EUTHYNEURA. 



Order OPISTHOBRANCHIATA. 



Suborder TECTIBRANCHIATA. 



Family ACT/EONID/E. 



Genus ACT/EON Montfoit. 



AcT^ox ovoiDES Conrad. 



Plate XXXIX, Fig. 2. 



Acteon ovoides Conrad, 1830, Jour. Acad. Nat. Sci. Phila., vol. vi, 1st ser., p. 227, 



pL ix, fig. 24. 

 Actceon ovoides Conrad, 18-12, Proc. Nat. Inst., Bull, ii, p. 186. 

 Actteon ovoides Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, p. .570. 

 Actceon ovoides Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 13. 

 Tornatella ovoides Meyer, 1888, Proc. Acad. Nat. Sci. Phila., vol. xl, p. 170. 

 Actceon ovoides Harris, 1893, Amer. Jour. Sci., ser. iii, vol. xlv, p. 28. Not Actieon 



ovoides Whitfield (A. ovoidea Gabb) = Avellana oiwidea. 



Description. — " Shell ovate, smooth, polished, transversely striated ; 

 spire short and conical ; aperture more than half the length of the shell ; 

 suture deeply impressed. The strige are about twenty in number on the 

 large whorl, and are impressed; the aperture is long and moderately 

 wide, and the fold large." Conrad, 1830. 



The shell is oblong-ovate, the most slender of our Maryland Actseons. 

 The revolving lines alternate in strength, extend quite to the suture, and 

 are punctate. There are som.etimes as many as thirty revolving lines on 

 the body whorl, and usually eight or ten on the earlier whorls. 



Length, 10.5 mm. ; diameter, 5.5 mm. 



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

 Langley's Bluff. Ghoptank Formation. Jones Wharf, Governor 

 Run (lower bed), Greensboro. Calvert Formation. Church Hill, 

 Plum Point. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

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

 Cornell University, Wagner Free Institute of Science. 



