268 =Mr. J. W. Kirkby on Remains of Fish and Plants. 
trals small, placed a little in advance of -posterior half of body ; 
anal fin larger than the preceding, situate at the commencement 
of last third of body ; dorsal somewhat larger than the anal, and 
placed between the ventrals and anal, but nearest to the latter 4 
caudal fin of moderate size, heterocerque, though not greatly so, 
spreading slightly outwards, with both lobes of nearly equal 
length. Scales vary greatly in size, those of the flank in the 
abdominal region being much larger than those covering the 
dorsal, ventral, and caudal portions of the body, except in those 
parts where large scales advance for some distance in front of 
the dorsal, anal, and caudal fins; the scales traversed by the 
lateral line and those adjoining are more or less subrectangular, 
the former being characterized by a deep notch in the upper 
half of the posterior margin; the scales of the caudal region 
are more rhomboidal in shape: the exposed margins of all the 
scales are plain; two or three lines of growth generally mark 
the surface just within the exposed margins ; and the surface, 
though smooth to the naked eye, is finely shagreened when 
magnified. 
2. Paleoniscus Abbsii, un. sp. 
Length 4,5, inches; greatest depth ,5, inch, or little more than 
one-seventh of entire length. Length of head 1 inch; breadth 
rather over half an inch. Form of head elongate, with a some- 
what projecting snout ; branchiostegal rays four or five? Dor- 
sal fin a little in advance of anal, but the posterior rays of the 
one are parallel with the anterior rays of the other; caudal fin 
more decidedly heterocerque than in the preceding species. 
Scales smooth, except in being marked marginally by lines of 
growth as in the preceding species; their shape resembles that 
of the scales of Paleoniscus varians, except in those on the flank 
being of less relative width; those of the lateral line are notched. 
3. Paleoniscus latus, n. sp. 
Length 23 inches; breadth 1, inch, or somewhat less than 
one-half the entire length. Head: length 5% inch; depth a 
little less ; slopes rapidly downward from the occipital region to 
the snout ; snout very obtuse; gape small. Fins small ; ventrals 
placed at the deepest part of the body, less than half an inch 
from the head; the other fins are placed similarly to those of 
the preceding species. The scales on the flank are longer than 
in P. varians, and arranged in much steeper rows ; their general 
form, however, shows no essential points of difference from the 
scales of that species. 
The general form. of this fish is gibbose 3; and in this respect it - 
differs strikingly from the specics already noticed, more especially 
from P, Abbsii. 
