Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. o73 
number of fin-rays composing that fin; it may be readily distinguished from 
C. sardinoides by the position of the dorsal fin, which in the latter species is 
considerably nearer the head than in the specimen now described. ‘The greater 
number of rays composing the anal fin distinguishes it from Clupea lata. From 
the description given by M. Pictet of the specimen called C. laticaudata (‘ Dese. 
de quelques poissons fossiles du Mont Liban.,” p. 39, pl. vi, fig. 3), it appears 
doubtful whether it should remain in this genus; at any rate, it differs very much 
from the type of the genus in the form of its tail, and in the relative positions of 
the dorsal and anal fins, the anterior rays of the latter being immediately under 
the posterior rays of the former; in these respects it is also quite distinct from the 
present species. 
Clupea macropoma, Ag. (‘“ Poiss. foss.,” vol. v., pt. 2, p. 115, pl. 874, figs. 3, 4), 
from Monte Bolea, resembles the species now described in some respects, but 
differs from it in the size of the dorsal and anal fins, the former being much 
larger, and the latter, though smaller, contains twenty rays, very fine and short. 
It may also be distinguished by the number of vertebrae composing the spinal 
column. This feature also applies to Cl. dentex, De Blainy. (op. cé#., p. 116, pl. Lxr., 
fig. 5). 
I propose to discriminate this species by appending to it the name of Mr. Lewis, 
to whose careful labours paleontologists will be long indebted. 
Formation and Locality.—The hard gray chalk: Hakel, Mount Lebanon. 
Ex coll.—Lewis Collection ; R. Damon, Esq., Weymouth. (Counterpart in the 
British Museum, Natural History Department.) 
Clupea brevissima, BLAINVILLE. 
C. brevissima. Buainvitie, 1818. ‘Ichthyologie,” p. 60, “ Extrait du Nouveau 
Dict. @hist. nat.,” vol. xxvii. 
C. brevissima. Burarnvitie, 1823. Id. trad. allem., p. 149. 
C. brevissima. Krucer, 1823. ‘‘ Geschichte der Urwelt,” vol. i1., p. 657. 
C. brevissima. Agassiz, L., 1838-48. ‘Rech. sur les poiss. foss., vol. v., p. 117, 
pl. ix1., figs. 6-9. 
C. brevissima. Gurrpen, 1848. ‘ Fauna der Vorwelt,” vol. 1., part 3, p. 126. 
C. brevissima. Prcrer, J. F., 1850. ‘‘ Desc. de quel. poiss. foss. du Mt. Liban.,” 
p. 41, pl. vut., figs. 1, 2. 
C. brevissima. Picrer et Humperr, 1866. ‘Nouv. rech. sur les poiss. foss. du 
Mont Liban.,” p. 61, pl. vi., figs. 1-4. 
(C. brevissima. Fraas, Oscar, 1878. ‘Aus dem Orient. II. Theil. Geolog. 
beobach. am Liban,” p. 91. 
Formation and Locality,—Hard chalk: Hakel, Mount Lebanon. 
Lx coll,—Museum, Geneva (type). The most abundant species found at 
TRANS. ROY. DUB. SOC., N.S. VOL. Ill. 41 
