{Fi'om The American Geologist, Vol. IX, June, 1892.'] 



[Notes on Pnhmzoic CrustaceiV No. 2.] * 



ON THE NORTH AMERICAN SPECIES OF THE 



GENUS AGNOSTUS. 



By A. W, VoGDEs, Fort Canby, Wash. 

 HISTORICAL SKETCH OF THE GENUS AGNOSTUS. 



The earliest known species of this genus was described and figured 

 by Bromell in 1729, Lithographia Siiecana, Actis Liter., Suecia3, Upsal, 

 vol. 2, p. 527, under the name of Vermiculi vagipenneg. The author mis- 

 takes the fossil for an insect and figures Agnostvs pisiformis from the 

 Olenus schist of Andrarum, Sweden. For a period of almost 

 one hundred years this was the only representative of a genus, to which 

 Brongniart gave the name of Agnostus, taking for its type Agnostvs pisi- 

 formis from Linn^'s Entomolithus pisiformis, Syst. Nat. Ed. xii, p. 160. 



Dalman uses the same species for the type of his new genus Battus in 

 1826, Paheaden p. 257. 



In the 5^ear 1828, Dalman, Vetensk, Akad, Arsber, p. 136, described a 

 new species from Gothland under the name of Battus Imvigatus, and a 

 new variety from Andrarum, as Battus pisiformis var. spiniger. The 

 next contribution to our knowledge of this genus was made by Beyrich 

 in 1845, Ueber Bohm Trilobiten, p. 44. The author adds two new 

 species to the list from the Paradoxides zone of Bohemia, under the 



*No. 1 of these notes is published in Trans. St. Louis Acad. Sci., Vol, 

 V, 1891. 



