596 NEW YORK STATE MUSEUM 



GYROCERAS DeKoninck 



Gyroceras c y c 1 o p s see Gyroceras (Rhyticeras) 

 cyclops 

 Gyroceras (Rhyticeras) cyclops Hall 



3686 i^pji TYPE Gyroceras cyclops Hall. Descriptions of 



new species of fossils from the Upper Helderberg, Hamil- 

 ton and Chemung groups. 1861. p. 39. 



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

 pi. 102. 



Onondaga limestone Clarksville N. Y. 



Gyroceras laciniosum Hall 



3687 i^JAi. TYPE Gyroceras laciniosum Hall. Paleontology 



of New York. 1879. v. 5, pt 2, p. 376, pi. 52A, fig. 8. 



Onondaga limestone Schoharie N. Y. 



J. Gebhard purchase 



Gyroceras liratum see Nautilus (Nephriticeras) 

 juvenis 



Gyroceras liratum see Nautilus (Nephriticeras) 

 liratus 



Gyroceras matheri see Gyroceras (Halloceras) 

 matheri 



Gyroceras (Halloceras) matheri (Conrad) Hall 



3688 * 2 f 22 TYPE Cyrtoceras matheri Conrad. Geological 



survey of New York; paleontological department; 3d an- 

 nual report. 1840. p. 206. 



Gyroceras matheri Hall. Illustrations of De- 

 vonian fossils. 1876. Cephalopoda, pi. 56, fig.. 3. 



Gyroceras matheri Hall. Paleontology of New 

 York. 1879. v. 5, pt 2, pi. 55, fig. 3, 4, 



Onondaga limestone Schoharie N. Y. 



J. Gebhard purchase 



3689 i^Mp 2 - TYPE Hall. Paleontology of New York. 1879. v. 5, pt 2, 



P 1 - 55> fi g- 5- 



Onondaga limestone Clarksville N. Y. 



Gyroceras nereus see Gyroceras (Zitteloceras) 

 nereus 



Gyroceras (Zitteloceras) nereus Hall 



12 f 2g HYPOTYPE Gyroceras nereus Hall. Descriptions 

 of new species of fossils from the Upper Helderberg, 

 Hamilton and Chemung groups. 1861. p. 39. 



