WOODWARD : FOSSIL FISHES OF TUB UPPER LIAS OF WHITBY. 333 
to arise just in front of the middle point between the pelvic fins and 
the caudal. The rays of the anal fin are rather stouter than those of 
the paired fins, and the undivided base of each is relatively much 
shorter, being less than half the total length of the ray. The 
broken remains of large, slender fulcra are observed on the anterior 
border of this fin ; and its rays, to the number of seven or perhaps 
eight, are separated by interspaces somewhat greater than their 
own width. The caudal fin rays (r.) are observed to be remarkably 
stout, finely subdivided, and very closely articulated almost to the 
base. The squamation is considerably broken and displaced, while 
many of the scales have lost their external layer of ganoine, and 
display the characteristic concentric structure of their bony basal 
portion. The scales of the \ entral aspect are smaller than those of 
the flank ; they are almost equilateral in shape, and when their 
hinder border is preserved it always appears to be destitute of 
serrations. Only two modified scales are seen, and these evidently 
bounded the anus in front of the origin of the anal fin. Both are much 
enlarged but quite smooth. The foremost (m. a.) is evidently bi- 
laterally symmetrical, and transversely arched to occupy the median 
line of the body : while it ends behind in a broad point which is sub- 
divided into short digitations. The hinder of the two scales (/. a.) 
is thrust to the left side ; and this is kfiown from other specimens 
to be one of a symmetrical pair. All the scales preserved on the 
caudal region are quite smooth and longer than deep ; and a few 
near the base of the caudal fin are of a distinctly irregular shape. 
The second well-preserved fish (pi. xlviii., fig. 2) is interesting 
as showing the general proportions of the head and trunk. It is 
imperfect both at the extremity of the snout and at the hinder 
border of the caudal fin, while the ventral scales in the abdominal 
region are clearly a little crushed downwards ; but making due 
allowance for these deficiencies, it may be justifiably inferred from 
the specimen that the length of the head and opercular apparatus 
was originally about equal to the maximum depth of the trunk, 
which would be contained approximately four times in the total 
length of the fish. There is nothing worthy of note in the remains 
of the head ; but the greater part of the clavicle (cL) is exhibited 
