TYPE SPECIMENS OF PALEOZOIC FOSSILS 551 



Platyceras platystoma Hall 



3392 uul±<l TYPE Platyceras platystomum Hall. Paleon- 



tology of New York. 1859. 3 : 326, pi. 60, fig. 2. 



Helderbergian Schoharie N. Y. 



Platyceras plicatum Conrad (sp.) 



3393 * L1L f L1 hypotype Calceola plicata Conrad. Annual report 



on the paleontology of New York. 1840. p. 207. 



Platyceras plicatum Hall. Paleontology of 

 New York. 1859. v. 3, pi. 64, fig. 2. 



Helderbergian Schoharie N. Y. 



3394 JJ HF L hypotype Hall. Paleontology of New York. 1859. v - 3> 



pi. 64, fig. 5. 



Helderbergian Schoharie N. Y. 



Platyceras retrorsum Hall 



3395 -^^ TYp E Platyceras retrorsum Hall. Paleontology of 



New York. 1859. 3 : 3 20 , pi- 58, fig. 10a, 10b. 



Helderbergian Albany county, N. Y. 



Platyceras retrorsum var. abnorme Hall 



339 6 ^f 1 * type Platyceras retrorsum var. abnormis 



Hall. Paleontology of New York. 1859. 3 •' 321, pi. 60, 

 fig. 4a-4c 



Helderbergian Schoharie N. Y. 



Platyceras rictum Hall. 



3397 —i 2 - 3 - type Platyceras rictum Hall. Descriptions of new- 



species of fossils from the Upper Helderberg, Hamilton 

 and Chemung groups. 1861. p. 7. 



Hall. Illustrations of Devonian fossils. 1876. Gaster- 

 opoda, pi. 4, fig. 12-14. 



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

 pi. 4, fig- 12-14. 



Hamilton shales Canandaigua lake, N. Y. 



C. A. White and C. Van Deloo, coll. i860 

 Platyceras sinuatum Hall 



(I39 8 JJ 4 ai TYPE Platyceras sinuatum Hall. Paleontology of 



(New York. 1859. 3:314, pi. 55, fig. 5, 

 Helderbergian Schoharie N. \ 



Platyceras spirale 1 1 .ill 

 399 Xftfjs type Platyceras spirale Hall. Paleontology ol 



New York. iS 59 . 3:331, pi. 63, fig, 6. 



Helderbergian Schoharie \ Y. 



