TYPE SPECIMENS OF PALEOZOIC FOSSILS 551 



Platyceras platystoma Hall 



3392 maiA TYPE Platyceras platystomum Hall. Paleon- 



tology of New York. 1859. 3 : 3 2 ^> P^ 60, fig. 2. 



Helderbergian Schoharie N. Y. 



Platyceras plicatum Conrad (sp.) 



3393 i-S^ii. 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 ^--f-- HYPOTYPE Hall. Paleontology of New York. 1859. v. 3, 



pi. 64, fig. 5. 



Helderbergian Schoharie N. Y. 



Platyceras retrorsum Hall 



3395 --f TYPE Platyceras retrorsum Hall. Paleontology of 



New York. 1859. 3: 320, pi. 58, fig. loa, lob. 



Helderbergian Albany county, N. Y. 



Platyceras retrorsum var. abnorme Hall 



3396 -i-^f 12 - 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 --f~ 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 York. 1879. v. 5, pt 2, 

 pi. 4, fig. 12-14. 



Hamilton shales Canandaigua lake, N. Y. 



C. A. White and C. Van Deloo, coll. 1860 



Platyceras sinuatum Hall 



3398 ^^-f--- TYPE Platyceras sinuatum Hall. Paleontology of 



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



Helderbergian Schoharie N. Y. 



Platyceras spirale Hall 



3399 f-~ TYPE Platyceras spirale Hall. Paleontology of 



New York. 1859. 3 : 331, pi. 63, fig. 6. 



Helderbergian Schoharie N. Y. 



