METOPASTER CORNUTUS. 55 
measurements :—major radius, 20 mm.; minor radius, 15°5 mm; length of the 
side, about 22 mm. The thickness of the margin is 7 mm. in a specimen whose 
side is 23°5 mm. 
Locality and Stratigraphical Position—The specimen described above and 
figured on Pl. XIV, fig. 4a, is from the Upper Chalk, near Bromley. It is 
preserved in the British Museum, and bears the register-number “46,776.” Other 
examples which I refer to the same species are also in the National Collection, 
and one, if not more, was obtained from the same locality. 
Remarks.—A fragmentary example which was figured in Dixon’s ‘ Geology and 
Fossils of the Tertiary and Cretaceous Formations of Sussex,’ pl. xxi, fig. 8, and 
was referred by Forbes to Goniaster (Goniodiscus) wncatus, now forms part of the 
collection in the British Museum, and bears the registered number ‘‘ H 2577.” 
This specimen appears to me to belong to the present species, and not to the true 
Metopaster wncatus. I can scarcely think that Forbes would have intentionally 
ranked the two forms as belonging to one species, and I have not thought it 
needful on the sole grounds of this fragment having been figured to regard 
Metopaster cingulatus as a dismemberment of Forbes’ Metopaster wncatus. 
Metopaster cingulatus is readily distinguished from Metopaster uncatus by its 
very short broad supero-marginal plates, by their more limited and more conical 
tumidity, by their greater height as seen in the margin, as well as by their 
different ornamentation. The ultimate plates are triangular, and do not present 
the peculiar form characteristic of Metopaster wncatus. In many respects 
Metopaster cingulatus appears to hold an intermediate position between Mitraster 
rugatus and Metopaster wncatus. 
8. Meropaster cornutus, Sladen. Pl. XIV, figs. 5a—5d. 
Body of small size. General form depressed. Abactinal surface slightly 
concave, the extremity of the rays being directed slightly upward. Actinal surface 
slightly convex. Marginal contour pentagonal, with the sides slightly lunate 
and the extremity of the rays slightly produced. The major radius is proportional 
to the minor radius as 100: 74, the actual dimensions in the example described 
being, major radius about 19 mm., minor radius about 14 mm. approximately. 
The length of the side is 225 mm. The margin is moderately thick and 
apparently well rounded. 
