LEPT0LEPID2E. 
525 
37928. Well-preserved fish 008 in length; Solenhofen. 
Haberlein Coll. 
P. 3680 c, P. 3681, P. 3685. A slightly larger specimen and two 
smaller, the second labelled by Munster “ Thrissops sal- 
moneus, var. brevis ” ; Kelheim. Enniskillen Coll. 
P. 914. Impression of fish 007 in length ; Mornsheim. 
Egerton Coll. 
37816-18. Three specimens from 0*06 to 0*032 in length ; Solen¬ 
hofen. Haberlein Coll. 
Thrissops rochei, Sauvage. 
1893. Thrissops rochei, H. E. Sauvage, Bull. Soc. Hist. Nat. Autun, 
vol. vi. p. 436, pi. viii. fig. 2. 
Type. Nearly complete fish. 
A species attaining a length of about 0*18. Length of head with 
opercular apparatus about equal to the maximum depth of the 
trunk, and contained five times in the total length of the fish. 
Vertebrae about 60 in number. Pelvic fins arising much nearer to 
the anal than to the pectorals; dorsal fin, with about 14 rays, 
arising opposite the origin of the anal, which has 40 rays; caudal 
fin less deeply forked and with broader lobes than in the type 
species. 
Form. Sf Loc. Lower Kimmeridgian : Orbagnoux, Ain, Prance. 
Not represented in the Collection. 
Thrissops portlandicus, sp. nov. 
[Plate XVIII. fig. 4.] 
Type. Nearly complete fish ; British Museum. 
A species attaining a length of about 0*35, perhaps sometimes 
larger. Length of head with opercular apparatus somewhat ex¬ 
ceeding the maximum depth of the trunk and contained five times 
in the total length of the fish. Vertebrae at least 60 in number, 
about 35 being abdominal and 25 caudal. Pelvic fins arising much 
nearer to the anal than-to the pectorals ; dorsal fin, with about 12 
rays, arising opposite the origin of the anal, which has at least 
25 rays ; caudal fin very deeply forked and the lobes slender. 
Form. Sf Loc. Portlandian : Dorsetshire. 
P. 5538. The type specimen in counterpart, one side shown of half 
the natural size in PI. XVIII. fig. 4; Portland Stone, 
Isle of Portland. The head is very imperfect, the jaws 
