178 



REPORT ON THE STATE CABINET. 



Productella subaculeata, 

 P. navicella, 



P, shumardiana, 



P. spinulicosta, 



P. truncata, 



From the Chemung group, we have : 



Productella dumosa, 

 P. exanthemata, 



P. tullia (n. s.), 



P. subalata. 



Productella Mrsuta, 



P. 



Jdrsuta var. rectispina, 



P. 



hystriciila (n. s.), 



p. 



boydii, 



P. 



costatula (ii. s.), 



p. 



ranspina, 



P. 



costatula var. strigata 



p. 



lachrymosa, 



P. 



ai-ctirostrata, 



p. 



lachrymosa var. lima, 



P. 



bialveata (n. s.), 



p. 



lachrymosa var. stigmata, 



P. 



onusta (u. s.). 



p. 



speciosa, 







Productella striatula {n. s.), 



So great a number of fossils of this type, in many localities, and par- 

 ticularly in the western part of the State, give a carboniferous aspect to 

 the strata ; and leaving out a few forms which gradually disappear in the 

 western extension of the formation, the palseozoic evidence might be 

 regarded as decidedly favoring this view. The distinction, however, 

 between Devonian and Carboniferous faunas is based as often upon geo- 

 graphical as chronological relations. 



The Genus Spirifera is fully represented in the rocks under conside- 

 ration. In the Upper Helderberg group, we have : 



Spirifera duodenaria, 

 S. macra, 



S. raricosta and 



S, grieri, ocurring both iu the Schoharie grit and ia the limestoue 



above; which latter likewise coutains the following species: 



s. 



gregana, 



8p 



irifera segmenta, 



8. 



oweni, 



8. 





aixlisegmenta. 



S. 



acuminata. 



8. 





euruteines, 



8. 



macrothyris. 



8. 





euruteines Y&v.fornacula 



8. 



unica (n. s.), 



8. 





mannii, 



8. 



disparilis, 



8. 





divaricata. 



8. 



varicosa, 



8. 





fimbriata. 



8. 



varicosa, var., 









The last named species occurs also in the Oriskany sandstone and 

 Schoharie grit. Several of the species indicated above are known in 

 their perfect condition only in the limestones of this age in Ohio and 

 adjacent States of Indiana and Kentucky. 



