-IS 



no doubt that it is from the Chouteau Group. The specific 

 name is in honor of Mr. A. Albers, of Cincinnati, Ohio, who 

 did the drawing for this bulletin, and who is a good palaeon- 

 tologist as well as an excellent artist. 



STROTOCRINUS BLAIRI, n. sp. 



Plaie II, Fig. 24, lateral view, some of the sutures obscure at 



the canopy. 



Species medium size. Calyx below the canopy obpyramidal, 

 truncated little, if any, beyond the size of the column, width 

 about one-half more than the height. Plates convex, the 

 larger ones bearing a central node, from which the plates are 

 radiately sculptured. Radial ridges on the lower side of the 

 canopy or projecting summit, but not distinguishable below 

 the third primary radials. 



Basals form a very low cup or rim more than four times as 

 wide as high; sutures beveled; facet for the attachment of the 

 column concave. First primary radials a little wider than high, 

 three hexagonal, two heptagonal. Second primary radials 

 about half as large as the first, wider than long, hexagonal. 

 Third primary radials nearly as large as the second, wider than 

 long, heptagonal and supporting on each upper sloping side a 

 single secondary radial, which is axillary and supports on each 

 upper sloping side the tertiary radials. As far as the sutures 

 can be determined in our specimen, where there is a single 

 tertiary radial in any series, it is axillary and bears quaternary 

 plates, but where there are two or more tertiary plates in the 

 series the last one is not axillary. The rays on each side of 

 the azygous area have each six arm openings to the vault, and 

 one of the lateral rays has the same number and the other 

 two rays as far as preserved indicate the same number. It is, 

 therefore, believed, that there are thirty arm openings to the 

 vault. 



The regular interradial areas are elongated and cut off from 

 the vault by the tertiary and quaternary plates. There are 

 eight plates in each area, one in the first range, two in the 

 second, two in the third, two in the fourth and one in the 

 fifth. The azygous area is also cut off from the vault by the 

 quaternary plates. The first plate is in line with the first 



