TYPE SPECIMENS OF PALEOZOIC FOSSILS 265 



OBOLELLA Billings 



Obolella crassa Hall 



1617 isgjL HYPOTYPE Orbicula? crassa Hall. Paleontology 



of New York. 1847. i : 290. 



Obolella crassa Hall & Clarke. Paleontology of 

 New York. 1892. v. 8, pt i, pi. 2, fig. 34. 



Lower Cambric Troy N. Y. 



S. W. Ford purchase. 



1618 5 - a f JL HYPOTYPE Ford. American journal of science. 1881. 



3d ser. 21 : 131, fig. i. 



Walcott. United States geological survey bulletin 30. 

 1886. pi. 10, fig. if. 



Walcott. zoth annual report of the director of the 

 United States geological survey. 1890. pi. 71, fig. 4f. 



Hall & Clarke. Paleontology of New York. 1892. 

 v. 8, pt i, pi. 2, fig. 35. 



Lower Cambric Troy N. Y. 



S. W. Ford purchase 



1619 i^f-Q- HYPOTYPE Ford. American journal of science. 1881. 



3d ser. 21 : 131, fig. 2. 



Walcott. United States geological survey bulletin 30. 

 1886. pi. 10, fig. id. 



Walcott loth annual report of the director of the 

 United States geological survey. 1890. pi. 71, fig. 4d. 



Hall & Clarke. Paleontology of New York. 1892 

 v. 8, pt i, pi. 2, fig. 36. 



Lower Cambric Troy N. Y. 



S. W. Ford purchase 



1620 i^f- 2 - HYPOTYPE Walcott. United States geological survey 



bulletin 30. 1886. pi. 10, fig. i. 



Walcott. loth annual report of the director of the 

 United States geological survey. 1890. pi. 71, fig. 4. 



Lower Cambric Troy N. Y. 



S. W. Ford purchase 



1621 2-aJLa HYPOTYPE (combination figure) Walcott. United States 



geological survey bulletin 30. 1886. pi. 10, fig. ib. 



Walcott. loth annual report of the director of the 

 United States geological survey. 1890. pi. 67, fig. i. 



Lower Cambric Troy N. Y. 



S. W. Ford purchase 



Obolella desiderata see Elkania desiderata 



