+ ae oe 
from the Kimmeridge Clay of Weymouth. 27 
The rays, in consequence of the numerous subdivisions, were 
probably, in the perfect specimen, fifty or more in number. 
The delicate pinnules or tentacula with which they are fur- 
nished are not closely arranged, but attached to every alternate 
joint ; they are about ;‘, of an inch in length, flattened, angular, 
and curved, consisting of about eight elongated jomts (fig. 1 /). 
The column or stem is composed of pentagonal plates of nearly 
equal thickness, each having a star-like, crenated articulating 
surface (fig. 1i, f), the external face of each angle being orna- 
mented with a faint band of bead-like markings, which be- 
come strong ridges accompanied by a central depression or pit 
towards the upper portion of the stem. At variable intervals, 
generally about the eighth joint, spring the ramules or auxiliary 
side-arms, five in number, developed from an articulating sur- 
face between each of the angles of a joint (fig. 1 7); im the 
specimen under consideration they are mostly broken off near 
the base ; the portions which remain show that they were round 
and closely jointed ; one of these articulating surfaces may be 
seen in the enlarged figures of portions of the stem (figs. Lh 
and e). : 
The plan of the arrangement of plates composing the calyx 
(fig. 1 c) is taken from a well-preserved and larger specimen, 
which is quite relieved from the matrix, exhibiting most per- 
fectly the whole of the plates of the head, with the lower sub- 
division of the arms, their upper portions being imperfect 
(fig. 1 5). 
Affinities and Differences—This species somewhat resembles 
Pentacrinus Milleri, Austin, but differs in the following parti- 
culars :—it is of more delicate proportions ; the branching of the 
rays takes place.at longer intervals; the tentacles are not so 
closely set; the column has sharper angles and square sides ; 
whilst in P. Milleri the angles of the pentagonal joints are much 
rounded and very prominent, and in our species the ramules are 
situated at greater distances. Pentacrinus scalaris, Goldfuss, 
said to be ‘a synonym of P. Milleri, is a species founded upon 
portions of the stem only; in some of its varieties, as figured 
by Goldfuss, it bears a considerable resemblance to the stem of 
P. Fisheri: it is, however, considered by good authorities to be 
identical with P. Milleri, from which our species is certainly 
distinct. 
Locality and Stratigraphical Range.—This interesting addi- 
tion to the Echinodermata of the Secondary Rocks was dis- 
covered by the Rey. Osmund Fisher, in the Kimmeridge Clay, 
at Green Hill, Weymouth, Dorsetshire. It was obtained from 
a bed of dark-blue clay, the surface of which was covered 
