322 EIGHTEENTH KEPORT ON THE STATE CABINET. 



EUCALYPTOCRINUS CORNUTUS (n. s.). 



Body (without the arms) somewhat turbinate, distinctly angular, with the 

 base broadly truncate and more or less concave. Basal plates compa- 

 ratively large, extending from the centre nearly one half the distance to 

 the edge of the truncation. First radial plates large, forming the 

 circumference of the base, and abruptly bending upwards they extend 

 nearly one-third the height of the calyx : second radial plates small ; 

 third radials much larger than the second, supporting the first supra- 

 radials, which are of moderate size. The first interradial plate is com- 

 paratively large, commencing just above the edge of the basal trunca- 

 tion, and supporting two smaller plates above. 

 Each of the first radial plates, on the part just above the basal truncation, 

 bears a strong central spine, with a prominent rounded ridge on each side, 

 extending to the upper lateral margin and joining a similar ridge on the 

 interradial plate, and another ridge extends from the upper side of the 

 central spine, and joins a similar ridge on the succeeding plate : this is 

 continued to the third radial, where it divides and extends on the supra- 

 radials. 

 The interradial plates of the first series are marked by similar strong 



ridges, which culminate in a strong node or short spine in the centre. 

 The finer surface markings are not known. Arms unknown. 



The specimens occur in a magnesian limestone : the test has been dis- 

 solved, leaving casts of the interior and impressions of the exterior surface, 

 and it is from these that we are able to derive the form and character. 

 This species is readily distinguished by its strong nodes and ridges, and 

 the spines upon the first radial plates. 



EUCALYPTOCRINUS CORNUTUS, var. EXCAVATUS. 



This variety differs from the typical forms in having the base deeply and 

 broadly excavated ; the cavity embracing the basal, and nearly the en- 

 tire length of the first radial plates. 

 The plates are marked by ridges and nodes. In some of the specimens the 

 second radial plates are very imperfectly developed, being reduced to a 

 mere flattened node which is entirely surrounded by the first and third 

 radial plates. 



In these specimens the dome has not been observed, and the arms and 

 axillary plates are unknown. The third radial plate is truncated above by 

 a long narrow plate, and the first interradial by two narrow plates sepa- 

 rated by a vertical suture, and has in all respects thus far the character of 

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