I«4 PALa:0NTOLOGY OF NEW- YORK. 



OEKI'S COROKOCRIlVrS (n.g.). 



[ Gr. xopwvi], corona; xftvte, lilium.] 



BoDT very broad, hemispherical ? towards the upper margins composed 



of numerous plates. 

 Arms numerous, proceeding from the upper margin of the body : summit 



flat, composed of numerous small plates. 

 Column and base unknown. 



Coronociinus iioIydACtjlus ( n. s.). 



Plate VI. Fio. 4-6. 



Base unknown : upper part of body, near the base of arms, composed 

 of numerous small plates. Summit nearly flat, composed of numerous 

 minute hexagonal plates. 



Arms numerous (about forty), consisting of a double series of plates, which 

 are wedgeform and closely interlocking at their inner edges, and rising 

 abruptly from the same line at the upper margin of the body. 



Proboscis unknown. 



The specimen from which the genus and species are described is a portion of the 

 circiunference of the- body, which has originally been nearly three inches in diameter 

 on the crown. The arms proceed abruptly from the upper margin of the body. The 

 summit is slightly depressed just within the arms, and thence towards the centre 

 is slightly convex. The fragment preserves the bases of eleven arms; and as it is 

 scarcely more than a foiu-th of the circumference, we may infer that there were 

 forty arms on the entire individual. The construction of the body as far as seen, 

 with the mode of origin of the arms, the chai-acter of the summit, etc., are sufficient 

 to indicate the form as a distinct generic type. 



Fig. 4. Lateral view of a fragment of the upper part of the body and bases of the arms. 

 Fig. 5. View of the summit, showing its structure, and the origin of the arms. 

 Fig. 6. Enlargement of some plates of the summit. 



Geological position and locality. In the shaly limestone of the Lower Ilelderberg 

 group, Schoharie. 



