CONTHIBUTIONS TO PALEONTOLOGY. 141 



CACABOCRINUS GLTPTUS? var. INTERMEDIUS. 



This form has the general proportions and structure of C. glyptus^ 

 but with a more elevated dome (many of the dome-plates with a 

 distinct node on the centre), and more deeply lobed between the 

 rays. In surface characters, the lines are only from two to four in 

 number, crossing the different margins of the plates; while on 

 some of the centres they form nodes, with several smaller sur- 

 rounding nodes. The ridge marking the radial series is but little 

 developed in the lower part, but strongly in the upper, rising in 

 nodes on the centres of the plates : those of the third radials are 

 prominent, and triangular in form. 



Regarding these variations as too marked to unite this form with the 

 preceding species, I have designated it as a variety, possessing charac- 

 ters intermediate to C. liratus and C. glyptus. 



Geological formation and locality. In the shales of the Hamilton group: 

 Livingston county. C. A. White, collector. 



CACABOCRINUS LAMELLOSUS ( n. s.). 



Body large, broad, spreading horizontally to the top of the third 

 radial plates. Basal depression for the column-attachment large, 

 deep, subcircular, embracing the basal and lower third of the first 

 radial plates. First radials large, broad near the upper end; upper 

 lateral margins short. Second radials short, broad, quadrangular. 

 Third radials larger than the second, broad, pentangular; the 

 upper margins long, supporting nearly as large supraradials. 

 These are cuneate above, and support on each upper side a series 

 of two secondary supraradials, which are much smaller : upon 

 the upper of these rests the first arm-plate. This gives four arms 

 to each ray, making at the arm-bases a formula of 



f^ z=: 20 arms. 



First interradial plate the largest in the whole body, ten or eleven- 

 sided, resting between the plates of the adjacent radial series as 

 high as the supraradial,and sometimes the secondary supraradial 

 plates. The second interradial plate is small, pentangular, with 

 parallel sides : the third interradial plates are two, resting on the 

 second. In one of these spaces (which may perhaps indicate an 

 anal area), the second supraradials do not rest upon the first in- 

 terradial plate, and there are two elongate plates in the second 

 range, with two or more small plates above in the third range. 



Surface marked by numerous slender radiating striae, which, in 



