244 
ACTIXOPTERTGII. 
Acrognathus libanicus, sp. nov. 
Type. Imperfect fish ; British Museum. 
An imperfectly known species about as large as the type, 
apparently of similar proportions, but with the mandible perfectly 
smooth and the scales marked with very delicate concentric lines 
following some of those of growth. Pelvic fins arising opposite the 
origin of the dorsal fin, which comprises 10 or 11 rays, the 2 or S 
foremost not divided distally; anal fin much smaller than the 
dorsal, with about 8 ravs. 
Form. Log. Tipper Cretaceous : Sahel Alma, Mt. Lebanon. 
P. 9404. Type specimen, a small fish somewhat distorted at each 
extremity. The head is too imperfect for description. 
About 30 vertebrae are distinguishable. Bemains of all 
the fins are preserved, but the dorsal is very imperfect. 
The characteristic squamation is partly removed, exposing 
an impression of the prominent ridge of the lateral line. 
Leivis Coll. 
P. 9405. Pragmentary large specimen displaying dorsal fin, cha¬ 
racteristic upper jaw, and smooth mandible. Levns Coll. 
P. 9406. Another fragmentary specimen, showing the vertically- 
crushed head from above. Lewis Coll. 
49596-97, -99, 49601-02, P. 9407. Ten imperfect specimens dis¬ 
playing the various characters of the genus and species. 
Lewis Coll. 
P. 9408. Small specimen displaying fins, associated with Acrogaster 
liecJceli. Egerton Coll. 
The following specimens have a relatively deeper trunk and 
shorter head than those referred to A. libanicus, but it is uncertain 
whether the differences are due to accidental distortion:— 
47395, 48110-11, 48124, 48145. Live specimens showing the 
characteristic fins and scales : Sahel Alma. Lewis Coll. 
'' ' 
Genus LUPTOSOMUS^ W. von der Marck. 
[Palaeontogr. vol. xi. 1863, j). 49.] 
As &arclinioides, but paired fins apparently nearly equal in size, 
and scales not serrated. 
All the known species are comparatively small, and the typical 
forms are slender. 
A 
