TYPE SPECIMENS OF PALEOZOIC FOSSILS 229 



DERBYA Waagen 

 Derbya keokuk Hall 



1361 Z*f- HYPOTYPE : HYPOPLATOTYPE Orthis keokuk Hall. 



Geological survey of Iowa. 1858. v. i, pt 2, p. 640. 



Derbya keokuk Hall & Clarke. Paleontology of 

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



Knobstone (Keokuk) group New Providence Ind. 



DIGNOMIA Hall 



Dignomia alveata Hall 



1362 7 Y TYPE Lingula alveata Hall. 1 6th annual report of 



the New York state cabinet of natural history. 1863. p. 23. 



Hall. Paleontology of New York. 1867. v. 4, pi. 2, 

 fig. 14. 



Dignomia alveata Hall. Notes on some new or 

 imperfectly known forms among the Brachiopoda. 1872. 



pl. 13. % 3* 



Hall. 23d annual report of the New York state 

 cabinet of natural history. 1873. pl. 13, fig. 3. 



Hall & Clarke. Paleontology of New York. 1892. 

 v. 8, pt i, pl. i, fig. 24. 



Hamilton shales Fultonham N. Y. 



W. M. Gabb, coll. 1857 



1363 ^Aj HYPOTYPE Hall & Clarke. Paleontology of New York. 



1892. v. 8, pt i, pl. i, fig. 25. 



Hamilton shales Canandaigua lake, N. Y. 



J. M. Clarke purchase 



1364 7 V HYPOTYPE Clarke. i3th annual report of the New York 



state geologist. 1894. v. i, pl. 4, fig. i. 



Upper Hamilton shales Livonia salt shaft, Livonia N. Y. 



D. D. Luther, coll. 1891 

 DINOBOLUS Hall 



Dinobolus conradi Hall 



74 i 20 HYPOPLASTOTYPE Obolus conradi Hall. 2oth an- 

 nual report of the New York state cabinet of natural 

 history. 1867. p. 368. 



Dinobolus conradi Hall & Clarke. Paleontology 

 of New York, 1892. v. 8, pt i, pl. 4B, fig. 14. 



Niagaran Near Le Claire la. 



