Description of Two New Sj^ecies of Crinoids. 



119 



REMARKS UPON A SPECIES OF CRISTELLARIA. 

 By C. Schlumberger, of Paris, France.* 

 Cristellaria rotulata. (?) 



Plate V., figs. 2 and 2a, magnified 17 diameters. 



(Cristellaria rotulata, ? D'Orbigny, 1839. Forannniferes de la 

 Craie; 31 em. Soc. Geol. de France, 1st ser., vol. iv., p. 26, pi. 2, figs. 15-18). 



Shell discoidal, symmetrical, with the spire composed of very closely 

 arranged cells. The sutures are fully indicated by faint undulations, 

 which permit the recognition of about twelve cells in the outer whorl. 

 The central portion of the shell is raised, and in young examples the 

 outer margin is marked by a narrow keel. The star- shaped opening 

 at the extremity of the last cell is sometimes situated upon the keel 

 itself. 



These characters ally the Alabama species to the Cristellaria rotu- 

 lata, from the white chalk, without, however, there being a complete 

 identity. 



The four examples collected belong to one species, notwithstanding 

 some differences in the keel and the prolongation of the last cell. In 

 the most perfect example (figured) the star-shaped opening is on the 

 keel, where as in the others, which are a little younger, the last cell is 

 somewhat prominent. The same differences are found in analogous 

 Cristellaria' from the Oxford ien and the Oolite. These specimens 

 taking into account the variations which may be shown in the species, 

 are too few in number to permit a satisfactory specific determination, 

 especially as they do not furnish any special ornament more or less 

 certain. It would then be premature in the absence of more speci- 

 mens to establish a new species. 



Locality : near Livingston, Alabama, from the Ripley Group or 

 upper part of the Rotten Limestone. 



Collected by S. A. Miller. 



DESCRIPTION OF TWO NEW SPECIES OF CRINOIDS 

 FRO M THE SHALES OF THE NIAGARA GROUP, 

 AT LOCKPORT, NEW YORK. 



By E. N. S. RlNGUEBERG. 



Macrostylocrinus fusibrachiatds, n. sp. 



Plate V-, fig. 4, natural size. 

 Body medium, five eighths inch high; bowl-shaped; resting below on 



Also translated from the French MS. of the author.— Ed. 



