from the Lias and Oolites, 45 
Oundle, Northamptonshire, where it is rare. We have dedicated 
this species to that gentleman, to whom we are indebted for 
much valuable information relative to the stratigraphical distri- 
bution of Echinoderms in his county, and likewise for a liberal 
contribution of materials to aid us in the completion of these 
memoirs. 
Pentacrinus Goldfussit, Wright. PI. III. fig. 3. 
Diagnosis.—Calyx composed of a central pentagonal plate, five 
small heart-shaped pieces, and five large triangular basal ele- 
ments; rays thick, strong and bifurcated ; total number of 
their subdivisions unknown ; the five primary rays consist of 
two pieces, the basal piece is flat, and has a slightly elevated 
portion about the centre of the upper surface, the brachial 
piece is strong and triangular, its base resting firmly on the 
former; the sides of the triangle support two arms ; the ten 
secondary rays consist of from ten to eleven circular pieces 
with smooth unequal undulated surfaces, whereby their thick- 
ness is rendered very unequal; the secondary rays support 
twenty tertiary rays, which have the same general character 
as the secondary rays; the number of pieces entering into the 
composition of each is unknown ; from the fragmentary state 
of this part of the specimen the number may be estimated at 
from fifteen to twenty pieces. The column near the calyx is 
composed of thin, deeply divided five-rayed plates, with well- 
marked transverse articular impressions on their surfaces ; 
every fourth plate is thicker, broader, and more prominent 
than the one above it or below it; the side arms are numerous, 
and composed of thin circular plates: the lower part of the 
column is unknown. 
Description.—This beautiful Sea Lily is remarkable among its 
Liasic congeners for the comparative strength and thickness of 
its rays ; the centrum of the calyx is simply a thickened and en- 
larged columnar joint to which the upper part of the column is 
articulated ; around the apices of the rays of this centrum five 
small heart-shaped basal pieces are inserted, the points of which 
are directed outwards; they are very convex externally, project- 
ing from the surface of the calyx, and have the appearance of 
five mammillary eminences disposed around the union of the 
column with the calyx. 
The rays are short and robust; the primary portion consists 
of two pieces, a flat basal plate and a triangular brachial plate ; 
the basal plate has a slight elevation on its outer and upper 
articular surface; the brachial plate has the form of an equi- 
lateral triangle, it is very convex externally, and has its base firmly 
