186 
PALEONTOLOGY OF NEW-YORK. 
Fig. 1 a. An. individual, natural size, with a portion of the column attached. 
Fig. 1 b. The head and arms of another individual. 
Fig. 1 c. The specimen fig. 1 b enlarged : the small plate supporting the arms is not present in 
this specimen, and one of the plates of the second series is divided transversely. 
Fig. 1 d. A figure showing the structure and form of plates. 
Fig. 1 e. A part of one of the arms enlarged. 
Fig. 1 /. A portion of the column of 1 a enlarged. 
Position and locality. In the higher part of the Niagara shale at Lockport. 
- {Collection of Col. Jewett.) 
580. 2. HOMOCRINUS CYLINDRICUS («. sp.). 
Pl. XLI. Fig. 2 a, b, c; 3 a, b, c. 
Body subcylindrical, and gradually enlarging above ; first and second ranges of plates 
nearly equal in size ; an intermediate plate inserted on the upper oblique edges of two of the 
costal plates, which divides the succeeding scapular plate, giving six in the third series; 
arms 1; column comparatively very strong, composed of alternating thicker and thinner joints, 
the thicker ones projecting and rounded on the edges. 
The specimen figured is very imperfect, the body and a small portion of the column alone 
remaining ; the arms are also broken off. All that remains, however, shows the simple struc¬ 
ture of the genus, with the plain unornamented surface of the plates. 
Fig. 2 a. The body and part of the column, natural size. 
Fig. 2 b. An enlarged portion of the column. 
Fig. 2 c. The structure, showing the single intercalated plate, and the division of the succeeding 
scapular plate. 
Fig. 3 a. The body of an individual somewhat more rotund than the preceding, showing the 
same general structure. 
Fig. 3 b. The base of the specimen which has one of the larger joints adhering, showing the 
central articulating portion, while the outer portion of the face is smooth. 
Fig. 3 c. A figure showing the structure of the specimen. 
Position and locality. In the central and lower part of the shale at Lockport. 
{Collection of Col. Jewett.) 
