4. RANGIA LECONTEI, Conrad. Proc. Ac. N. S. Phil. 232, 1860. 

 Gnathodon Lecontei, Conrad. II. Ac. N. S. Phil. 1853. 



Hab. N. America. 



5. RANGIA MENDICA, Gould. Conrad, Proc. Ac. N. S. Phil. 



232, 1860. 



Mactra mendica, Gould. Proc. Bost. Soc. N. H. iv. 88, 1851. 

 Gnathodon trigonum, Petit. II. Conch, iv. 84, 1853. 

 Gnathodon mendica, Gould. Proc. Zool. xxiv. 200, 1856. 

 Eangia trigona, Petit. Adams, Rec. Gen. ii. 380, 1858. Hab. 

 N. America. 



6. RANGIA MINOR, Conrad. Proc. Ac. N. S. Phil. 232, 1860. 



Gnathodon minor, Conrad. Foss. Test. form. 69, pi. 39, f. 6. 

 Hab. N. America. 



7. RANGIA PARVA, Petit. Adams, Rec. Gen. ii. 380, 1858. 



Conrad, Proc. Ac. N. S. Phil. 232, 1860. 



Gnathodon parvum, Petit. II. Conch, iv. 358, pi. 13, f. 9, 10, 

 1853. Hab. New Holland. 



8. RANGIA ROSTRATA, Petit. Adams, Rec. Gen. ii. 380, 1858. 



Gnathodon rostratum, Petit. II. Conch, iv. 84, 1853. 



Eangia flexuosa, Conrad. Proc. Ac. N. S. Phil. 232, 1860. 

 Hab. N. America. 



Eangia trigona, Petit. Adams, Rec. Gen. ii. 380, 1858, is Ean- 

 gia mendica, Gould. 



While preparing this paper, there appeared in the June num- 

 ber of the Proceedings of the Academy of Natural Sciences of 

 Philadelphia Mr. Conrad's Synopsis of the genus Eangia. It 

 will be seen, however, that the views here taken are not always 

 the same as those of Mr. Conrad. 



