266 NEW YORK STATE MUSEUM 



Obolella gemma Billings 



1622 78 1 51 hypotype Obolella gemma Billings. Canadian 



naturalist and geologist. 1872. new ser. 6: 218. 



Walcott. United States geological survey bulletin 30. 

 1886. pi. 10, fig. 2a. 



Walcott. 10th annual report of the United States 

 geological survey. 1890. pi. 72, fig. 2. 



Hall & Clarke. Paleontology of New York. 1892. 

 v. 8, pt 1, pi. 2, fig. 42. 



Lower Cambric Troy N. Y. 



S. W. Ford purchase 



1623 Z-SJU, hypotype Hall & Clarke. Paleontology of New York. 



1892. v. 8, pt 1, pi. 2, fig. 43 [34]. 

 Lower Cambric Troy N. Y. 



S. W. Ford purchase 



1624 -■¥"- hypotype Hall & Clarke. Paleontology of New York. 



1892. v. 8, pt 1, pi. 2, fig. 44. 

 Lower Cambric Troy N. Y. 



S. W. Ford purchase 

 Obolella polita Hall 



1625 i^ta hypoplastotype Lingula? polita Hall. Annual 



report of the geological survey of Wisconsin. 1861. p. 24. 



Obolella polita Hall & Clarke. Paleontology of 

 New York. 1892. v. 8, pt 1, pi. 2, fig. 38. 



Potsdam sandstone Trempaleau Wis. 



Obolella p r e t i o s a .f<f<? Linnarssonia pretiosa 

 Obolella transversa see Linnarssonia transversa 

 Obolus conradi w Dinobolus conradi 

 Obolus g a 1 1 e n s i s see Rhinobolus galtensis 



oehlertella Hall & Clarke 



Oehlertella exilis Hall 



1626 Z8p& type Lingula exilis Hall. 13th annual report of the 



New York state cabinet of natural history, i860, p. 76, 

 77, fig. 2. 



Hall. Paleontology of New York. 1867. v. 4, pi. 1, 

 fig. 8. 



Marcellus shale Bridgewater N. Y. 



F. B. Meek, R. P. Whitfield and C. Van Deloo, coll. 1857 



