246 
ACTINOPTERTGII. 
1866. Leptosomus macrourus, Pictet & Humbert, Nouv. Recb, Poiss. 
Foss. Mt. Liban, p. 75, pi. x. figs. 1-4. 
1866. Leptosomus o'assicostatus, Pictet & Humbert, ibid. p. 76, pi. x. 
figs. 5-7. [Distorted fisli; Geneva Museum.] 
1887. Leptosomus macrourus, J. W. Davis, Trans. Roy. Dublin Soc. [2] 
vol. iii. p. 584, pi. xxxiv. fig. 5. 
1887. Leptosomus crassicostatus, J. W. Davis, ibid, p. 584. 
Type. Imperfect fish; Geneva Museum. 
A diminutive species, attaining a length of about 0*06. Length 
of head with opercular apparatus contained two and a half times, 
and maximum depth of trunk four times in the length from the 
pectoral arch to the base of the caudal fin. Vertebrae and fins as 
in the type species. 
Form. Log. Dpper Cretaceous : Sahel Alma, Mt. Lebanon. 
Among numerous specimens the following may be noted:— 
P. 3842. Well preserved specimen figured by Davis, loc. cit. The 
skull is very imperfect, and the ceratohyal with its 
branchiostegal rays is crushed downwards beneath it. 
Enniskillen Coll. 
46454, 46546, 47388, 48141-43. Eight specimens, variously im¬ 
perfect and more or less distorted, no. 48142 displaying 
the scales. Lewis Coll. 
P. 1884-5. Four similar specimens. Egerton Coll. 
46549, 47390, 48146-48, P. 9172. Eight specimens shortened and 
deepened by distortion, the first in counterpart. 
Lewis Coll. 
Leptosomus minimus (Agassiz). 
1839 44. Clupea minima, L. Agassiz, Poiss. Foss. vol. v. pt. ii. p. 120, 
pi. Ixi. fig. 1. 
1866. Clupea minima, Pictet & Humbert, Nouv. Rech. Poiss. Foss. Mt, 
Liban, p. 65. 
Type. Imperfect fish ; olim Amic Collection, Paris. 
A diminutive species, attaining a length of about 0*04. Length 
of head with opercular apparatus equalling nearly one half, maximum 
depth of trunk scarcely more than one third the length from the 
pectoral arch to the base of the caudal fin. Yertebrse about 30 in 
total number. Fins apparently as in the type species. 
Form. (^' Log. Upper Cretaceous : Hakel, Mt. Lebanon. 
49477, P. 80, P. 4783. Three slabs exhibiting a shoal of this 
species. Ijewis Coll. 
