ECHINODERMATA—CRINOIDEA. 



555 



the anal interradius, possessing three plates in first row instead 



of one. Siluric. 



170. M. striatus Hall. Siluric. 



Calyx about one half inch high, inverted pyramidal. 



Niagaran of Indiana. 



LXV. Melocrinus Goldfuss. 

 Calyx pear- or melon-shaped, the rays extended into free tubular 

 appendages passing upward and bearing biserial arms on both 

 sides. B 4. Costals two. Tegmen highly elevated or scarcely 

 convex, formed by relatively larger unsymmetrical orals. Anal 

 aperture excentric, usually extended in a small tube. Column 







o. 





C3C> 



Fig. 18 



Melocrimis roemeri, summit, side view and analysis. (After Roemer. ) 



round, composed of alternate long and short joints (Fig. 1887). 

 Siluric and Devonic. 



171. M. oblongus Wachsmuth and Springer. Siluric. 



Slender, with greatest width either less than or just equal to 

 length. Dorsal cup obconical; sides straight to the top of the 

 second costals whence the rays turn outward. Plates unorna- 

 mented. Tegmen low. 



Niagaran of Kentucky and Indiana. 



