184 
ACIINOPTEMGII. 
laminar expansion of one pelvic fin-support is distinc ^ 
and some of the bordering scutes on the caudal region 
observed to be prolonged into the lath-shaped plates- 
Lewis Coll . 
Leptotrachelus hakelensis, Pictet & Humbert. 
1866. Leptotrachelus hakelensis, Pictet & Humbert, Nouv. Rech. P 
Foss. Mont Libnn, p. 98, pi. xiv. fig. 8. 
Type. Imperfect fish ; Geneva Museum. - t j, 
An imperfectly known small species about 0T2 in lengt , ^ 
much attenuated rostrum. Anterior abdominal region shot , 
much attenuated rostrum. Anterior abdominal region sn ’^ er 
vertebral centra not more than twice as long as deep ; total nun ^ ar 
of vertebra probably about 60. Length of head with p P er | 
apparatus about equalling the distance between the pectora 
pelvic fins ; distance between the pelvic and anal fins consi e 
greater. Dorsal and ventral triradiate scutes much attenua 
Form. Loc. Upper Cretaceous : Mt. Lebanon, Syria. 
P- 6001. Relatively large and well-preserved specimen, ^ p 0 
the end of the tail ; Hakel. The operculum sceD ^ 9 j e£ p ; 
nearly quadrangular in form, a little broader t ^fif 
and it is bordered below by a suboperculum of 8 0 t j lC 
its depth. The vertebrae are shown, with traced t , n tary 
very delicate dermal scutes; and there are f ra ~ n . q 0 U. 
remains of the pectoral, pelvic, and anal fins. Tin 
■ <r the for© 
P. 4683. Smaller and more imperfect specimen, showing 
of the craniul roof ; Hakel. g jggl. 
Presented by Sir J. William Dawson, h.C- 
Leptotrachelus elongatus (Agassiz). 
[Plate XII. fig. 4.] (oaBI e 
1835. Dercetis elongatus, L. Agassiz, Poiss. Foss., Fenill- p- 
onl y). ’ t ii. p- 2B8 ’ 
1837-44. Dercetis elongatus, L. Agassiz, ihid. vol. n. P 
pi. lxvi a. figs. 1, 2, 5-8 ( non figs. 3, 4). . 145. 
1879. Dercetis elongatus, W. Davies, Geol. Mag. [2] T0 *' T ol. *• 
1888. Dercetis elongatus, A. S. Woodward, Froc. Geol. 
P- 318. 
Type. Imperfect fish ; British Musenm. , Q.g ; but 
A slender species, probably attaining a length of abou ^ roa J 
usually smaller. The postorbital region of the skull abou B£ jt 
as long, this occupying the hinder quarter and the orbi 
