24 
As this fossil may thus be seen figured, in its complete state, in 
the works of these authors ; and as its cast is a more uncommon fossil, 
and will also serve to convey a satisfactory idea of the general form 
of this species, a small specimen of a perfect cast is represented Plate 
II. Fig. 8, from Malta. 
Scutum altum, vel Echinanthus altus, has only yet been met with 
in a petrified state. It differs from the former species in being higher, 
and having wider ambulacra. Figures of it have been given by Scilla, 
Tab. ix. Fig. 1,2; Bonan. Nat. Hist. Tab. xxxvi. Fig. 1 ; by Mer- 
catus, Met. Mus. p. 233 ; and by Leske, Tab. liii. 4. A specimen 
of this fossil, which I possess, may, I think, be considered as a variety 
from those which have been figured by the above authors. Although 
equally high, its sides rise not so suddenly, but more obliquely, to the 
vertex; forming, therefore, a more acute angle with the base. I 
obtained, at the sale of the Leverian Museum, a complete specimen, 
being the nucleus of the echinite of the above authors : it serves to 
give a correct notion of the structure, as well as of the form of this 
echinite. PI. IV. Fig. 7- 
Scutum ovatum, vel Echinanthus ovatus. The fossils comprised 
under this species of Leske, differ so considerably in form from the 
preceding, as seems fully to authorize their separation into two genera. 
The difference which is discoverable between different specimens of 
the oval scuta appears also to be such, as would fully warrant the 
separating of them, with Klein, into species, instead of into varieties, 
as has been done by Leske. Fossils of this form are figured by 
Aldrovandus, Mus. Met. p. 498, Fig. 1, 2; Mercatus, Mus. Metal. 
p. 232 ; Rumphius, D’ Amboinsche Ear. R. lix. Fig. d ; and others. 
The one which is here represented, from Verona, Plate II. Fig. 5, is 
interesting on account of the distortion of its figure, and particularly 
of one of its rays. 
Leske regards as a doubtful species, Echinanthites orbicularis, 
since the specimen from which he forms his species, and which is 
