102 
ACTINOPTEKYGII. 
irregular longitudinal series, the largest posterior teeth comprising 
two pairs with one median tooth in advance. 
Form. Sf Loc. Upper Corallian and Kimmeridgian : Hanover l . 
Not represented in the Collection. 
Lepidotus unguiculatus, Agassiz. 
1829. u Schuppenhaut eines imbestimmbaren Peptils,” E. Riippell, 
Abbild. u. Beschreib. Yerstein. Solenhofen, p. 11, pi. iv. 
1832. Lepidosaurus, H. von Meyer, Palseologica, p. 208. 
1833-37. Lepidotus unguiculatus, L. Agassiz, Poiss. Foss. vol. ii. pt. i. 
pp. 9, 251, pi. xxx. figs. 7-9 ( non p. 254, pi. xxix. c. fig. 1). 
1863. Lepidotus unguiculatus , A. Wagner, Abh. k. bay. Akad. Wiss., 
math.-phys. Cl. vol. ix. p. 623. 
Type. Portion of squamation. 
So far as can be ascertained from the descriptions of Agassiz and 
Wagner, the fine specimen mentioned below pertains to L. unguicu¬ 
latus andjustifi.es the following diagnosis. 
A species attaining a length of about 0*8. Trunk robust, the 
length of the head with opercular apparatus equalling about two- 
thirds the maximum depth of the trunk, and occupying somewhat 
more than one-fifth of the total length of the fish. Maximum 
width of operculum slightly exceeding half its depth, and equalling 
about one-third the length of the head. External bones apparently 
smooth or sparsely ornamented. Teeth short and stout and smooth, 
the majority oval in outline and with a well-defined median coronal 
tubercle or apex. Ein-fulcra very large on the dorsal fin, com¬ 
paratively small on the anal and lower lobe of the caudal fin; all 
the median fin-rays especially robust. Pelvic fins arising nearer to 
the anal than to the pectorals ; anal fin arising opposite the posterior 
extremity of the dorsal. Scales smooth, none serrated, but the 
postero-inferior angle more or less produced, and the hinder margin 
often with one or two notches immediately above this ; dorsal ridge- 
scales acutely pointed but inconspicuous. 
Form. Sf Loc. Lower Kimmeridgian (Lithographic Stone) : Bavaria. 
37022. Nearly complete fish 075 in length, with the right operculum 
removed and shown from the inner aspect above the head, 
and part of the abdominal squamation disturbed ; Solen- 
1 Specifically indeterminable scales from the Kimmeridgian and Portlandian 
of N. France ( Lepidotus fittoni, H. E. Sauvage, errore, Catal. Poiss. Form. 
Second. Boulonnais, 1867, p. 18, pi. i. figs. 24, 25) are also ascribed to this 
species by H. E. Sauvage, Bull. Soc. Gfeoh France, [3] vol. viii. (1880), p. 526. 
The so-called pharyngeals of Pgcnodus dutertrei figured by Sauvage, loc. cit. 
1867, ph ii- fig- 9, are much like the splenials of L. affinis. 
