New Species of Fossils from Hudson River Group. 



23 



Bodmania, n. gen. 



[This genus is dedicated to Mr. Charles Bodman, who con- 

 tributed fifty thousand dollars to the Cincinnati Society of 

 Natural History.] 



Equivalve, profoundly inequilateral ; ventricose ; general 

 outline resembling Cypricardites ; beaks at the anterior end 

 incurved over the cardinal line; hinge line short and at a 

 very high angle to the base of the shell ; ligament external ; 

 shell thin ; concentrically lined or smooth. The casts show 

 no muscular scars and the hinge line is unknown, but, evi- 

 dently, there are no lateral teeth, and, probably, ho teeth 

 beneath the beaks. The absence of muscular scars, position 

 of the cardinal line and external ligament ally this genus 

 with Sphenolium, while the general outline and umbonal 

 slopes give it the appearance of Cypricardites. Type B. 

 insuetum. This genus will include the form described by 

 Hall as Edmondia ventricosa, in Pal. N. Y., Vol. I, p. 155, from 

 the Trenton Group of New York, and which has been gen- 

 erally referred to Cypricardites, or Palcearca. 



BODMANIA INSUETUM, n. sp. 



Plate 1, Fig. 5, left side view ; Fig. 6, right side view of the same 

 specimen ; Fig. 7, anterior end view of the same. 



Shell short, subelliptical in outline, ventricose in front and 

 in the umbonal region, and cuneate toward the base and pos- 

 terior end. Hinge line short, straight, and at an angle from 

 the basal line of about fifty degrees, from the posterior end of 

 which the shell is slightly winged, giving to the shell the 

 greatest height posterior to the end of the hinge line. The 

 posterior end is subtruncate or moderately rounded, the basal 

 margin is very broadly rounded. The anterior end is sub- 

 cordiform. Beaks pointed and incurved beyond the hinge 

 line at the anterior end. Shell thin and probably concen- 

 trically lined, though the part preserved on the specimen 



