8 



February 5, 1862. 



The President in the chair. 



The following paper was presented, and referred to the 

 Publishing Committee. 



Description of new species of Fossils from the Devonian 

 AND Carboniferous Eocks of the Mississippi Valley, by 

 Charles A. White, of Burlington, Iowa. 



ECHINODERMATA. 



Crinoidea. 



Genus Cyathocrinus Miller. 



Cyathocrinus rigidus (n. s.) Body subglobose, basal plates 

 rather small, tumid in their centres, presenting a somewhat pentapeta- 

 lous appearance ; subradials rather large, convex and protuberant, 

 about as wide as high ; first radials as wide as high, about the same size 

 as the subradials, a little wider below than above ; articulating facet 

 occupying the greater part of the width of the plate, and reaching down 

 nearly half its length, slightly excavated, and having a good-sized 

 notch in its upper margin ; second radials small and short ; third radials 

 wider and larger than the second, and upon these the arms strongly 

 diverge ; in a part of the arms the second bifurcation takes place 

 upon the same plate which rests upon the third radial, and the third 

 bifurcation, in some of these, occurs on the second plate from the sec- 

 ond bifurcation. The lower arm-plates are short and strong, the upper 

 ones are long and rather slender, and, being slightly curved in differ- 

 ent directions, give the arms a rigid appearance, which is increased 

 by slight angularities on their backs. Surface of the body-plates cov- 

 ered with numerous small, irregular nodes, which are sometimes 

 rather sharp and prominent, and have a tendency to arrange them- 

 selves in radiating lines from the centres of the plates. Suture lines 

 distinct, giving a prominent appearance to the plates. Column 

 round, moderately strong, and composed of rather thin joints of 

 alternating width. 



This species is of about the same size and general form as C. vimi- 

 nalis of Hall, but its surface-markings and peculiar arms will readily 

 distinguish it from any other described species in these rocks. 



Locality and position, in the lower division of the Burlington Lime- 

 stone, Burlington, Iowa. — My own cabinet. 



Cyathocrinus Kelloggi* (n. s.) Body robust, wider than high ; 

 basal plates of moderate size, rounded, truncated, and slightly exca- 



* Dr. G. M. Kellogg, Keokuk, Iowa. 



