196 Twenty-fourth Report on the State Museum. 



pressed, giving the transverse diameter a little more than twice the 

 vertical diameter ; lateral margins of the volutions obtusely angular 

 toward the dorsal side. 



The surface has apparently been marked by several (three or four) 

 revolving ridges or carinse on each side of the center or dorsum, which 

 is gently concave ; finer surface markings and aperture unknown. 



Formation and locality. In limestone, below the "Hydraulic 

 beds," near Louisville, Ky. Cabinet of Dr. James Knapp. 



List of Species of Fossils feom the Falls of the Ohio, the 



VICINITY OF JeFFEESONVILLE, InDIANA, AND THE NEIGHBORHOOD 



OF Louisville, Kentucky.* 



Silurian Species. 



Crinoidea. 



Actinocrinus Meekii Lyon. Melocrinus obconicus Troost 



Saccocrinus Christii Hall. Lecanocrinus (n. sp.) 



Eucalyptocrinus coelatus Hall. Haplocrinus maximus Troost. 

 Eucalyptocrinus crassus Hall. Caryocrinus ornatus Say. 

 . Pentremites Rein ward tii Troost. 



Brachiopoda. 



X Orthis elegantula I^^m &kw m i. I>oii7t'>iH7i 



X Qrthis hybrida Mttr c hison . 6'fi?t/e,rlu, 



7^ Strophomena rhomboidalis Wahlenherg. 



/ Streptorhynchus subplan;^ Conrad. 



pC Spirifera radiata Sow. = Sp. cyrtwna Dalman. ^ 



X Spirifera Niagarensis ? Conrad. ^y'^\ ^^^/ ' 



/ Spirifera bicostata Yanuxem. 



Spirifera Eudora Hall. 

 > Cyrtia myrtia ? Billings = C. exporrecta Dalman. 

 / Meristina nitida Hall. 

 / Meristina nitida var. oblata Hall. 

 X Meristella Maria Hall. 



/ Rhynchospira globosa : var. parva H. dh W. 

 ^ Atrypa reticularis Zm?^OBi^^ tya^^, n^t^^a-^<^^$ii~ "HtJtt^* 



* The following list of Silurian and Devonian fossils is made up from collections which have 

 passed under examination during the preparation of the Palieontology of New York. These 

 fossils have been derived chiefly from the cabinet of Dr. James Knapp, of Louisville, Kentucky, 

 while many have been received from Prof. James R. Eaton, Major S. S. Lyon, and from personal 

 collections made in 1841 and at subsequent periods. 



