REPORT OF THE STATE PALEONTOLOGIST I903 249 



S. cyclopterus occurs very abundantly in the Coeymans 

 and Upper New Scotland ; it is found less frequently in the Lower 

 New Scotland and Becraft. The Coeymans specimens are more 

 compressed laterally than the majority of those from the New Scot- 

 land. The latter ones have the plications more angular also, thus 

 partially approaching vS . m u r c h i s o n i . 



S. concinnus Hall 



Exceedingly abundant in the Becraft. It differs somewhat from 

 the type description.^ The number of plications on a shell of average 

 size is less than that given by Hall. The following table will give 

 an idea of the comparison in the pedicle valve between Hall's figures, 

 specimens measured from Becraft mountain, New York, from Scho- 

 harie, New York and from Trilobite mountain. 



w 



H 



a 

 w 



Width 

 Number of 



PLICATION 



Hall's 



Hgnres 



25 



34 12 



21 



22 14 



12 



13 8 



10 



13 6 



From the New Scotland, called by Hall a large 



shell. 

 From the Becraft. This Hall calls large. 

 From the Becraft. 

 From the Becraft. 



Specimens from. Becraft 'mountain 

 21 24 9, 10 A large specimen. 

 13 18 8 

 15 22 9 The average size 



Specimens from Schoharie, Nezv York 



27 31 13 Probably from the New Scotland. 



28 29 II Probably from the New Scotland. 



Specimens from Trilobite mountain, Nezv York 



25 30 12 Large specimens. 



17 24 8-10 Average specimens. 



'Pal. N. Y. 3:200, pi. 25, 28. 



