328 EIGHTEENTH REPORT ON THE STATE CABINET. 



In a paper upon some Niagara fossils from Indiana, published in the 

 Transactions of the Albany Institute in 1860, I made some observations 

 upon the G-enera Gltptocrinijs, Glyptaster, Balanocrintts and 

 Lampterocrinus. At that time I had overlooked the fact, that the ge- 

 neric name Balanocrinus had been proposed by Prof. Agassiz in 1846*; 

 and therefore the same name proposed by Dr. Troost in his Catalogue of 

 1849, for a very different fossil, cannot be sustained. In 1860, Dr. Ferdi- 

 nand R(EMER proposed the name LampterocrinusI for the same fossil 

 to which Dr. Troost had given the name Balanocrinus, and this later 

 generic designation will necessarily be adopted. 



It may however, on the final revision of the crinoidean genera, become a 

 question, whether those forms now distinguished as Glyptocrinus, Glyp- 

 taster and Lampterocrinus should not constitute a single genus. 



Some illustrations of the structure of these different forms will be found 

 under Observations upon the Crinoidea of the Hudson E-iver group, in the 

 present report. 



The following species may be added to those here described, from the 

 limestones of Racine and Waukesha. 



GLYPTOCRINUS NOBILIS. 



Glyptocrinus nobilis : Hall, Report of Progress Geol. Survey of Wisconsin, 1861. 



p. 21. 



This is a large and beautiful species, having the plates of the body 

 strongly ridged, with a broad elevated dome. 



GLYPTOCBINUS SIPHONATUS. 



Glyptocrinus siphonatus : Hall, Report of Progress Geol. Survey of "Wisconsin, 



1861, p. 22. 



This is a smaller species than the preceding ; but having been described 

 from casts, we do not know its entire external form. 



GENUS LAMPTEROCRINUS (Rcemer). 

 LAMPTEROCRINUS INFLATUS. 



Balanocrinus inflatus : Hall, ut sup. p. 22. 



This species is smaller than the L. teiinesseensis, 'RcEi^i'ER=Bala7wcrinus 

 sculptus, Troost, Catalogue of Crinoidea. 



24 



* Bulletin, Soc. des Sciences Naturelles, Neuchaetl. 

 t Die Silurische Fauna des "Westlichen Tennessee. 



