CRETACEOUS ECHINODERMATA. 331 
of bearing two, three or more rows of obtuse tubercles, which are sometimes ob- 
solete, and when present form a ridge on their centres. Inferior marginals 
smooth, or minutely punctate. Superior oculars triangular ; not so long or 
broad as the laterals: in other respects similar to them. Ossicula of disc hex- 
agonal, granulated, unequal. 
Not a rare species from the upper chalk ; variable. The specimen engraved 
is from the cabinet of the late Channing Pearce, found in Wiltshire ; it occurs 
also in Kent and Sussex. 
Goniaster (Goniodiscus) uncatus. (Tab. XXI. fig. 4, 5,8.) C. 
Body pentagonal, with projecting angles and nearly straight sides. Superior 
intermediate marginal plates four, broad, tumid and centrally rugose, with an 
impressed nail-like border on the inner side: externally sloping, and marked 
with a broad nearly obsolete groove. Inferior laterals plain, broader than the 
superior, smooth or minutely punctate. Superior oculars acuminate, triangular, 
marginate, mitrate, tumid and irregular centrally. Ossicles of disc rather large, 
hexagonal, punctate. Madreporiform tubercle flat, small, polygonal. 
A common species. Easily distinguished by the large, pointed, and as if 
pinched pair of ocular plates at each angle. Kent and Sussex. 
The specimen figured, from Mr. Pearce’s cabinet, was discovered in the Wilt- 
shire chalk. 
Goniaster (Goniodiscus) sublunatus. 
Body pentagonal, with gently lunated sides. Superior intermediate marginal 
plates four, nearly equal, plain, smooth or minutely punctate. Inferiors similar. 
Superior oculars mitrate, large, triangular, acuminated. Ossicula of disc 
punctate. 
Kasily distinguished from the last species by its flattened marginals and from 
the next by its lunated sides. 
Mus. Bowerbank, from the white chalk ; also in the collection of the Geolo- 
gical Survey. 
Gomiaster (Goniodiscus) Hunteri. (Tab. XXI. fig. 1.) C. 
(Goniaster regularis, Mantell, Medals, vol. i. p. 335, cut 73.) 
Body very obtusely pentagonal, sides nearly straight or projecting. Superior 
