1888.] NATURAL SCIENCES OF PPIILADELPHIA. 133 



wide, slightly arched transversely giving the base of the calyx a 

 moderately pentagonal form which is shared by a few of the upper 

 joints of the column. 



Basals long. ^ 



First radials wide and short with a deep horse-shoe shaped articu- 

 lar facets in the center of the upper margin which arches strongly 

 •outward to conform to this facet which is directed upward and out- 

 ward for the reception of the brachials. These are about eleven in 

 number before any bifurcation takes place. One ray is observed to 

 bifurcate twice above this point. Only the anterior sides is as yet 

 known. 



Column round, long, thick in its lower portion where it is quinque- 

 partite ; it gradually tapers as it ascends till within a short distance 

 below the calyx where it is less than half of its original thickness, 

 and here its quinque-partite character disappears; and it continues 

 of the same thickness for some distance till within four millimeters 

 below^ the cup when it again? commences to enlarge, finally becoming 

 sub-pentagonal just before reaching the calyx. Length of column 

 twenty centimeters — diameter near base about two and one half 

 millimeters; at a short distance below calyx about one millimeter. 



Radix tapering, inclined to one side and throwing off lateral root- 

 lets from the under half; it has been traced for about two centime- 

 ters but evidently was somewhat longer. 



This species is readily distinguished from D. longidactylus Hall, 

 which is found in this group by the elongated calyx with its much 

 higher basals and underbasals also by having about twice as many 

 brachials before the first bifurcation takes place, and by having a 

 sharper ridge in the first series; being there much like those above 

 the first bifurcation in the former. The peculiar character and 

 appearance of the brachials are almost sufficient to mark it as a 

 Dendrocrinus. 



The calyx was carefully scaled out of its matrix but unfortunately 

 the posterior side was found to be so crushed in as not to admit of 

 an accurate discription. 

 Mariacrinus warreni (n. sp.) PI. VII, fig. 4. 



Calyx inverted peuta-pyramidal, irregularily expanding from the 

 base to the second bifurcation of the radials, at which point it is, in 

 the type specimen, thirteen millimeters high; angles sharp with 

 strongly projecting, heavy, rounded carinae, the surface of which is 

 crossed by well defined, and generally transverse, rugae. 



