196 PALEONTOLOGY OF ILLINOIS. 



The column, as observed in two specimens, is from 4 to 5 

 inches long. It tapers gradually from the calyx down, and ter- 

 minates in a fine needle point. It is round, and composed of 

 rather long segments, the nodal joints more prominent. Only 

 the lower portions of the stem, for about two-thirds of its 

 length, are cirrhus-bearing. The joints which bear the cirrhi are 

 higher than the intermediate ones, and while increasing in length 

 they decrease in width downward; the cirrhi are given off singly, 

 and are directed upwards, contrary to those of the preceding 

 species which hang downward; they are long, threadlike and 

 taper at their ends. 



Geological position, etc.: The same as that of the last species. 



Our own collection. 



SCAPHIOCRINUS GLOBOSTJS (nOV. Sp.) W. & Sp. 

 PL XVII, Fig. 8. A specimen of unusually large size. 



A small species. Calyx semi-globose ; the plates without orna- 

 mentation or convexity. 



Underbasals minute, resting within a concavity formed by the 

 basals; rounded at their lower end; covered completely by the 

 column. The basals are comparatively large; four of them 

 regularly pentagonal, the fifth somewhat larger and hexagonal, 

 supporting upon its truncate upper face the anal plate. 



Radials short, twice as wide as high. Brachials triangular, 

 meeting their fellows of adjoining rays; the two sloping upper 

 sides forming an acute angle; each side supporting from four 

 to six arm-plates of a second order, the upper one axillary. 

 There are two more branches above, making four arms to each 

 ray, the anterior one being not distinct. They are composed of 

 strongly wedge-shaped pieces, slightly swelling toward their 

 larger end; the axillaries more prominent. Pinnules strong; 

 tubular. 



Anal plate larger than the azygous piece; ventral sac unknown. 

 Column unusually small, round, its diameter less than that of 

 the arms near their tips. 



Geological position, etc. : The same as the last. 



Our own collection. 



