228 
palaeontology of new-york. 
602. 1. MELOCRINITES SCULPTUS. 
Pi. XLIX A. Fig. 2 a - d. 
Compare Melocrinites l<zvis, Goldfuss, ut supra, pi. 60, fig. 2. 
Base concave ; column round • articulating surfaces of joints strongly striated ; striae 
reaching nearly or quite to the canal; pelvic plates spreading outward and downward, en¬ 
closing the column, and having their surfaces marked by a few concentric lines ; costal plates 
five, bending, slightly downwards to their centre, from which point they are suddenly bent 
upwards ; surface of costal plates marked only by concentric lines or ridges; costal plates, 
at the point of bending upwards, marked by a strong angular node on each side, and below 
this an equally prominent one in the centre of the plate ; near their upper margins these plates 
are each marked by three prominent sharply angular ridges, which probably corresponded to 
similar ones on the succeeding plates. 
This crinoid, when held in a reversed position, has a coronate appearance, from the promi¬ 
nent angular nodes on the margins of the costal plates. The base of the pelvic plates is 
depressed below these angles to the depth of three eighths of an inch. This feature contrasts 
very strongly with the narrow protruding base of M. hieroglyphicus ; and there is in the figure 
of M. Icevis no appearance of a depression at the base, though the upper margins of the first 
costal plates of our specimen are marked in a manner very similar to that species. 
Fig. 2 a. View of the base of this species, showing the plates slightly separated. 
Fig. 2 b. A figure showing the structure and relative position of the plates. It will be seen by this 
figure, that if the pelvic plate on the upper side were divided, it would make two 
of the same form as the other three. This structure of the base clearly arises from a 
development of a single plate in place of two, accompanied also by a slight modifi¬ 
cation of the adjoining pelvic plates in the extension of their sloping sides. 
Fig. 2 c. The interior of a cup which is much elevated in the centre, showing an exterior de¬ 
pression corresponding to the specimen described. In this fragment the divisions of 
the plates are not conspicuous, and it may possibly prove a distinct species. 
Fig. 2 d. The articulating surface of a joint of the column, attached to the specimen fig. 2 a. 
Position and locality. This species, of which only the fragments figured are known, was 
found in the lower part of the Niagara limestone at Lockport. (Collection of Col. Jewett.) 
