174 : Cincinnati Society of Natural History. 
Intersecondary radials three, the lower one hexagonal and supporting 
upon the upper sloping sides two small plates. 
The azygous area is depressed in the upper anterior region, and the 
number of plates in it are about twenty, but our specimens are not 
well preserved on this side, and the count can not, therefore, be re- 
garded as accurate. 
The vault is flat, with the exception of a central proboscis, and a 
depression which extends from it toward the anterior or azygous side, 
gradually deepening to the margin. It is covered by numerous poly- 
gonal plates. ; 
There were twenty arms, as shown by the ridges representing the 
ambulacral furrows in fig. 4a. 
There are no ridges upon the radials, or that cross from one plate 
to another, but, on the contrary, all the plates are highly convex and 
smooth, which, alone, is sufficient to distinguish this species from all 
others that have been defined. It is not constricted below the arms, 
and has fewer interradials than most species. It may also be distin- 
cuished generally by the obconoidal shape. . " 
The type specimens were collected at Cicero, Illinois, by W. C. Egan, 
Esq., in whose honor I take great pleasure in proposing the specific 
name. 
CYATHOCRINUS CoRA, Hall. 
This species, originally described from Racine, Wis., where the arms 
have not been preserved, occurs at Cicero, near Chicago, Ill. A speci- 
men now before me shows part of the arms. The arms bifurcate and 
spread almost at right angles on the second plate; they again bifurcate 
on the second plate, one division ascending straight up; the lower 
division bifurcates in like manner twice, and the first ascending ray 
also bifurcates on the second plate. We have here ten rays to each 
arm, or fifty rays soon after the commencement of the arms. Beyond 
this point the arms are not preserved. 
MELOCRINUS OBPYRAMIDALIS, W. and M. 
(Actinocrinus obpyramidalis, Winchell and Marcy, 1865, Mem. 
Bost. Soc Nat. Hist. ) 
The specimens collected by Mr. Egan show some characters that | 
have not been defined. The body in the lower part is pentangularly — 
obpyramidal. The radial series stand out in salient angles, with dea 
