December, 1843.] 323 



MEETING FOR BUSINESS, AND ANNUAL MEETING, 



December 26, 1843. 



Vice President Morton in the Chair. 



The Committee, to whom was referred Mr. Conrad's paper, 

 read November 21st, and the additions thereto read Decem- 

 ber 1 .9th, reported in favour of publication. 



Descriptions of nineteen species of Tertiary fossils of Virginia and North 



Carolina, 



By T. A. Conrad. 



Anomia. 



Anoxia Ruffini. Subovate or suborbicular, irregular ; larger valve with 

 concentric lamins, sometimes obsolete, often closely arranged towards the base, 

 plicated on the margin ; disk with numerous irregular interrupted radiating fur- 

 rows and lines ; hinge area wide ; muscular impression very large, ovate-elon- 

 gated. Height of the largest specimen, two and a half inches. 



Locality. Pamunkey river, Kent county, Virginia. 



This fine large species was found by Edmund Ruffin, Esq., and I take plea- 

 sure in dedicating it to a gentlemen distinguished for his science, and his suc- 

 cessful and enlightened efforts to improve the agriculture of his country. 



Arca. 



Arca propatula. Rhomboidal, thick and ponderous; posterior side produced ; 

 sides flattened, slightly concave towards the base; uinbonial slope rounded, rather 

 elevated ; ribs about thirty-two, square, not profoundly prominent, about equal 

 in width to the interstices, which have transverse imbricated lines ; ribs largest 

 about the umbonial slope, very distinct on the posterior slope, which is con- 

 cave towards the hinge line ; posterior margin oblique, concave, extremity wide- 

 ly rounded ; summit of umbo moderately elevated, slightly retuse ; cardinal area 

 wide, with diverging grooves; series of teeth slightly sinuous anteriorly ; teeth 

 numerous ; at the posterior extremity, the series suddenly becomes dilated, and 

 the teeth interrupted or tubercular; inner margin crenate, crence profound, and 

 remote posteriorly. Length, four inches ; height, rather more than one and 

 one-third inches. 



Locality. James river, below City Point. Petersburg, Mr. Tuomey ; Ware 

 river, Gloucester county, Virginia, Mr. Kuffin. 



Perhaps this may prove to be an old specimen of A. arata, Say. 



44 



