524 A. L. ADAMS ON VERTEBRATA OF THE 
the two anterior and one of the middle ridges, the remainder of the 
crown having been broken recently and lost. 
The other tooth is still more imperfect, only one of the anterior 
and middle nipples remaining. It differs, however, from the former 
crown; for whilst its anterior ridges have also been quite recently 
broken off, the surface of the tooth, where the two companion ridges 
of those still extant should be, is firmly incrusted with the matrix, 
showing that the enamel had been denuded prior to or during the 
imhedment of the tooth. 
Both molars have the bases of their crowns where the fangs 
originate also covered with the characteristic calcareous sandstone 
of the islands. 
Mr. Wright informed me that he procured the specimens from a 
native boy, and that he visited the spot and fully confirmed the 
statements of the finder. ‘The specimens were found at different 
times by the same lad, and were cut out of the solid compact Cal- 
careous Sandstone *. 
The specimen fig. 5, was discovered in October 1871, on one of the 
<< nodule-seams ” of the Calcareous Sandstone, close to the shore, and 
nearly at the sea-level, in the Bay of Marsa el Forno, on the N.E. of 
Gozo. 
The other tooth “was found in December 1873 in the same 
horizon, but at a distance of a few hundred yards further west- 
ward, near the promontory called Kola Baida.”’ 
The characters and state of detrition of the crowns are the same 
in both teeth, which are no doubt penultimate molars. 
That they belonged to a trilophodont Mastodon seems to me 
probable from the diminished extent of continuity, indicating a 
surface barely sufficient for two additional ridges, and which must 
have been smaller a good deal than those stil] existing. 
Both molars, especially that shown in fig. 5, display much rough- 
ening (vr) of the enamel around the base of the ridges and out- 
lying mamille. In these respects, as in the presence of other digi- 
tations on the crown and sides of the ridges, they approach M. an- 
gustidens rather than M. Borsonz in character. 
A broad pressure-mark (j) is seen on either tooth on the talon. 
The dimensions and characters, so far as procurable, agree with 
those of the penultimate of M. angustidens ; but altogether they are 
insufficient for the differentiation of species. 
PHOCA RUGOSIDENS, Owen. 
Professor Owen, to whom I sent the teeth (Pl. XXYV. figs. 1, 2) 
from Malta, has named them rugosidens, from the pronounced 
roughening of the enamel. Altogether four specimens were dis- 
covered in the Calcareous Sandstone of Gozo 7, two of which, from 
Mr. Wright’s collection, are also represented with the above. 
* The matrix corresponded with the locality pointed out. In the case of 
fig. 5, Mr. Wright examined the cutting made with a knife in the rock to extract 
the specimen. 
+ Notes of a Naturalist, p. 269. 
