﻿NEW AND OLD MIDDLE DEVONIC CRINOIDS 



MEGISTOCRINUS MULTIDECORATUS (Barris) 



1885. Megistrocrinus nodosus multidecoratus Barris, Davenp. Acad. 

 Nat. Sci., iv, p. 99, pi. 11, figs. 3. 4. 



This species is represented in the collection of the I'. S. National 

 Museum by several well-preserved individuals from the type locality. 



Formation and locality. — Upper Traverse limestone: Partridge 

 Point, Alpena, Michigan. 



Cat. No. 36,021 U. S. N. M. 



MEGISTOCRINUS NODOSUS Barris? 



1878. Barris, Proc. Davenp. Acad. Nat. Sci., 11, p. 285. 



A large individual is referred with some doubt i>< M. nodosus. It 

 differs from the type in the presence of nodes on the calyx plates 

 above the first two rows, but the number of nodes on the surface of 

 a crinoid is usually a variable feature. 



The tegmen is slightly, not deeply depressed in the interradial 

 areas. 



The nodes on the upper calyx plates resemble those of .1/. sphceralis 

 n. sp., but the tegmen is much flatter and is composed of smaller and 

 more numerous plates. 



A young individual measuring 11 mm. in height and 17 mm. in 

 diameter is referred to this species on account of the flat tegmen and 

 deeply indented interradial spaces. 



Formation and locality. — Middle Traverse (Hamilton) limestone: 

 Collins' quarry, Alpena, Mich. The species is first reported from the 

 Middle Devonic of Davenport, Iowa. 



Cat. No. 35,143 U. S. N. M. 



MEGISTOCRINUS CONCAVUS Wachsmuth 

 1885. Wachsmuth, Proc. Davenp. Acad. Nat. Sci., iv, p. 96, pi. 1, figs. 



5, 6, 7. 



Formation and locality. — Upper Traverse limestone : Partridge 

 Point, near Alpena, Michigan. 



Cat. No. 36,016 (Rominger collection) U. S. N. M. 



MEGISTOCRINUS SPINOSULUS Lyon 

 1861. Lyon, Proc. Acad. Nat. Sci. Phila., p. 413, pi. iv. fig-, fa, b. 



Formation and locality. — Onondaga: Columbus, O. Reported 

 also from the Hamilton of Louisville, ky. 



Cat. No. 42,431 (Ulrich collection) U. S. N. M. 



