KONINCK — NEW PAL.EOZOIC CRINOIDS. 
181 
on the left of the anal plates is hexagonal, its general form also is not quite the 
same as that of the other radial plates ; that on the right differs totally from these : 
it is in some sort quadrangular, slightly transverse, and furnished on the left side 
with a little prolongation corresponding to the second anal plate. The figure below 
•will display, better than any description could explain, the differences which 
exist between the various pieces. 
The two first anal pieces only are known to me ; the one rather large pentagonal, 
and a little longer than broad ; its upper side is narrow, and supports the second 
plate, also pentagonal, but extremely small. The thickness of all these plates 
being considerable, the free space occupied by the animal is thus very much 
restricted, and the calix, as seen from the upper side, presents but a very narrow 
opening, and is not unlike, especially in the artic\ilar surfaces of the radial plates, 
the head of the Apiocrinus. PI. iv. f 4. & 4^. The stem ought to be small and 
cylindrical, judging from the small diameter and the form of the impression left 
by its last articulation on the base of the calix. 
Dimensions. — Length of calix 13"™, largest diameter 12'"™^ diameter of 
superior edge 8'"™, of the stem 2"'"' ; length of sub-radial plates about Gmm. 
Affinities and Differences. — The Poteriocrinus nuciformis,* M'Coy, is 
the only species of crinoid which approaches this, but differing in its 
more elongated form, and still more in the welding of the two little 
anal plates at the upper edge of the former, whilst our species has 
but one in this situation. 
Position and Localitij. — This species has been found with the pre- 
ceding in the environs of Glasgow. I know only two specimens, deposited 
in the Museum of the Geological Survey, at London ; and it is also to the 
kindness of Mr. Salter, that I am indebted for my acquaintance with 
them. 
Explanation of figures. — PI. IV : — 
Fig. 1. — Specimen, of natural size : the anal side. 
Fig. \a. — The same, twice magnified : the same view. 
* Descript. Brit. Pal. Foss. Mus. Cambridge, p. 117, PI. 3 D. fig. 4. 
