328 CRETACEOUS ECHINODERMATA. 
Arms bordered by two rows of plates (marginal ossicula) ; those of the supe- 
rior row transversely oblong, lobed, convex, marginated, centrally punctated 
and imbricated ; the inferior border composed of more regular, very long, curved, 
margined, obliquely truncated plates. Between the two series are small tuber- 
cular ossicles. The summit of the arms is flat, and composed of a central series 
of depressed, middle-sized, lobed, oblong ossicles with intermediate smaller 
ones. 
Lower chalk, Washington, Sussex. Mrs. Smith of Tonbridge Wells has a 
beautiful example of this species found in Kent. 
Oreaster Boysii. (Tab. XXI. fig. 6.) R. 4, Kent. 
Body pentagonal with prolonged arms. Disc convex, with a circle of large, 
subglobose, margined, punctated tubercles (spines), and intermediate smaller 
ones, similar hut depressed. Rays steep-sided, bordered by oblong, margined, 
imbricated, centrally punctated plates, forming two rows. ‘There are a few in- 
termediate ossicles on the upper surface of the arms near their bases. 
Upper chalk, Kent. The specimen figured was discovered by Major Boys, 
and formed part of his interesting collection. 
Oreaster squamatus. (Tab. XXIII. fig. 7.) R. 4. 
Disc and arms similar in shape to O. coronatus, the former covered in the centre 
with large, depressed, conoidal, truncated, polygonal ossicles, of which there are 
nine and a central one; also a few intermediate smaller ones. The remainder 
and less convex portion composed of lobed, imbricated, convex ossicles, very 
nearly of a size. A double series of these, with a single set of small intermediate 
ossicles, go to form the summits of the arms, the sides of which are formed by a 
double series of oblique subreniform plates. 
Upper chalk, Kent ; in Mr. Catt’s cabinet. 
Oreaster bulbiferus. (Tab. XXIV. fig27.) R. 2. 
Disc very convex, covered in the centre with flat, many-lobed, punctated plates, 
seme of which are very large. Opposite the origin of each ray is a large tuber- 
cular, very convex conic plate, with a wide and lobed base. The surface of all 
these plates is punctated ; a few similar plates, but less, and more regular in 
form, run down the origins of the arms. They gradually decrease and separate 
the origins of two series of transversely oblong, overlapping, lobed, bordered 
