part 4.] Fmtmantel: Eryon comp. Barrovensis. 198 
Note on “ Eryon comp. Barrovensis,” McCoy, from the Seipermatue Group near 
Madras, by Ottokar Feistmantel, M.D, 
Amongst the fossils from the Sripermatur group, near Madras, which were sent in by 
Mr. Foote, and which contain numerous plant impressions and remains of marine animals, 
there is also the impression of a fossil Crustacean. The impression shows a portion of the 
carapace, a fragment of one leg, and the abdomen. The specimen is very flatly pressed, 
although the adnexa of the epidermis are pretty well marked. From the extremely flat 
carapace, and from the condition of the seventh segment and of the caudal plates, is shown 
that our specimen belongs to the genus Eryon, Desm. 
CRUSTACEA, DECAPODA, MACRURA. 
Eryones, Desm. 
Eryon comp. Barrovensis, McCoy, Figs. 1, 2, 3. 
1849. McCoy: On the classification of some British fossil Crustacea. Ann. and Mag. Nat. H., vol. iv., 2nd 
series, p. 172. 
1858. William Jardine: Memoirs of Hugh Edwin Strickland, London, p. 227 (figure). 
1862. Oppel: Palwontologische Mittheilungen I. Uker jurrassische Crustacean, p. 11. 
1866. Woodward (H.): Notes on the species of the genus Eryon, &c. Qu. Journ. Geol. Soc. of London, vol. xxii, 
p. 495, Ac., pi. xxv, fig. 1. 
In our specimen there is only about one-third of the carapace preserved, very flatly 
pressed. The lateral margin, as far as can be seen from the preserved portion, was denticulated; 
the posterior margin is slightly emarginated: at the point ot junction of the lateral and 
posterior margins there seems to have been a somewhat projecting angle. In the median line 
of the carapace are seen two oblong impressions, which seem to be connected, and of which 
the lower one, near the posterior margin, is deeper and narrower. 
These two impressions answer, of course, to tubercles of the same form on the surface of 
the real specimen (ours being only a negative impression). 
About in the middle between this median series of tubercle impressions and the lateral 
margin, there is seen another longitudinal slight impression, running in an oblique direction 
from the posterior margin towards the anterior portion and the median line. This impres¬ 
sion must have been caused by a prominent ridge, which had the same direction. 
The breadth of the carapace at the broadest part was 44 mm.: of its length I cannot 
judge. There is a fi*agment of a leg; and from its size and form, I must judge that it 
belongs to one of the first pair of legs. 
The abdomen is about one-third narrower than the carapace, as far as can be seen from 
the impression. 
Seven segments are well seen. The first is narrower and much shorter than the others: 
in the median line there is an oblong, deep impression: the lateral portions of this segment 
are not well shown. 
The following four segments are almost equally long, but they get a little nanower 
towards the seventh segment. Each of these segments shows in the median line an oblong, 
pretty deep impression and, besides this, two lateral tubercular impressions, quite close to the 
anterior margin. The sixth segment shows the same condition as the four preceding ones ; 
but is narrower. It continues into the seventh, which is much narrower, but longer, of a 
triangular form, ending in a pretty sharp point. At its base this segment is a little con¬ 
stricted, but gains again its entire breadth, finishing from thence in the pointed apex. 
The lateral margins of this seventh segment are finely and sharply denticulated. 
