TYPE SPECIMENS OF PALEOZOIC FOSSILS 553 



Hall. Paleontology of New York. 1879. v. 5,pt2, 



P 9i P 1 3 % 30- 



Hamilton shales Canandaigua lake, N. Y. 



Platyceras trilobatum Hall 



3407 -if2.c TYPE Platyceras trilobatum Hall. Paleontology 



of New York. 1859. 3 : 316, pi. 57, fig. 5a~5c. 



Helderbergian Schoharie N. Y. 



Platyceras undatum Hall 



3408 -1^-a.fci TYPE Platyceras undatum Hall. Illustrations of 



Devonian fossils. 1876. Gasteropoda, pi 7, fig. i, 2. 



Hall. Paleontology of New York. 1879. v. 5, pt 2, 

 p. 17, pi. 7, fig. i, 2. 



Onondaga limestone Schoharie N. Y. 



Platyceras ventricosum Conrad 



3409 -2-^p~- HYPOTYPE Platyceras v ent ri c o su m Conrad. An- 



nual report on the paleontology of New York. 1840. 

 p. 206. 



Hall. Paleontology of New York. 1859. v - 3' P^- S^> 



fig- 3 a > 3 b - 

 Helderbergian Schoharie N. Y. 



Platyceras ventricosum see Diaphorostoma 

 ventricosum 



Platyostoma aplata see Diaphorostoma apla- 

 tum 



Platyostoma euomphaloides see Diapho- 

 rostoma euomphaloides 



Platyostoma lineata see Diaphorostoma linea- 

 tum 



Platyostoma lineata var. a m p 1 a see Dia- 

 phorostoma lineatum var. amplum 



Platyostoma lineata var. c a 1 1 o s a see Dia- 

 phorostoma lineatum var. callosum 



Platyostoma turbinata see Diaphorostoma 

 turbinatum 



Platyostoma turbinata var. see Diaphoro- 

 stoma turbinatum var. 



Platyostoma sp. see Diaphorostoma sp. 



