CONTRIBNTIONS TO PALEONTOLOGY. 



137 



GENUS CACABOCRINUS ( Troost, Catalogue). 



DOLATOCRINUS? ( Lyon). 



The generic formula of this genus, according to the typical species 

 of the author, is as follows : 



Basal plates, 3; 



Radials, 5X3; 



Radials of the second series, or supraradials, 10 x 1 or 2; 



Interradials, 1 to 10 or more. 



Anal area not distinguishable from the interradial areas. 



CACABOCRINUS ( Diagram of the typical species) . 



a 



Qo;^ 



w^ 





CACABOCRINUS SPECIOSUS ( n. s.). 

 Body of medium size, oblate or depressed-spheroidal, with strongly 

 protruding arm-bases. Dome moderately elevated, with a short 

 obtusely pointed spine, at the base of which is a somewhat large 

 anal aperture. Basal plates small, entirely concealed within the 

 basal depression. First radial plates large, the inner margins 

 bending into the basal depression. Second radials much smaller, 

 quadrangular, a little wider than high. Third radials wider than 

 the second, short, pentagonal; supporting upon each sloping side ;1uh? 

 a series of three plates, one above the other : upon the upper of \ d*^ 

 these, rest the first arm-plates. ^ 



[Senate, No. 116.] 18 



