ON SOME PELMATOZOA FROM CHAZY LIMESTONE OF NEW YORK 121 



would read " either basals or radials." They are undoubtedly 

 radials and crassibasalis is rather a misnomer. The speci- 

 men should have been named crassiradialis and it seems to 

 belong to the Eucalyptocrinidae. It would, I believe, be possible 

 to uncover the edges of these radials and thus determine the number 

 and something of the character of the third circlet of plates. I am 

 deeply indebted to Dr J. F. Whiteaves for the loan of this specimen 

 and I have figured it here in the hope that some one may lift it out 

 of the list of indeterminable names. The genus and species are 

 both good and the form must be reckoned with in the future study 

 of these interesting primitive groups. 



deocrinus gen. nov. 



Ssgo, to bind; Kpivov, a lily 



Genotype Rhodocrinus asperatus Bill. 



Calyx globose, with a rather narrow and shallow basal concavity, 

 involving the small interbrachials and about one third, or less, of 

 each basal. Primibrachs two, second secundibrachs are unsym- 

 metrical, secundaxils each giving off a large pinnule with very 

 deep ambulacral grooves, which is incorporated with the cup and 

 the first ossicle of which meets its opposite neighbor over the top- 

 most interbrachial in each interradius : the first, third and fifth 

 secundibrachs are nonpinnule bearing; all subsequent brachials bear 

 pinnules and the first two of these have also become a part of the 

 cup or meet to form a weblike extension of the bases of the arms. 



Arms, so far as shown, but two to each ray, the brachials uni- 

 serial at least up to II Br 9 , beyond that unknown ; one or two inter- 

 secundibrachs are present in each radius. Tegmen composed of 

 some hundreds of small rounded pebblelike plates extending out 

 over the ambulacral grooves of the lower pinnules and the base of 

 each arm. Anus nearly central and having a tube whose stout 

 lower plates are arranged with their long axis radially disposed. 

 Anal interradius differing but little from the others. 



Remarks. " Archaeocrinus has a more elongate calyx . . . 

 has no anal tube, and never supplementary pieces "* in the inter- 

 radii such as we find in the genotype of Deocrinus. There is also 

 an absence of the median ridge over the brachials in this genotype 

 and the upper interbrachials do not " connect imperceptibly with 

 the plates of the disc " 2 but the plates of the tegmen are separated 



1 Wachsrrmth & Springer. The Crinoidea Camerata of North America, p. 250. 



2 Ibid. 



