TRANSACTIONS OF SECTION C. 511 
The casts Nos. 2and 3 are from the bed marked A in the annexed sketch of the 
quarry. No. 4is from bed B, and Nos. 5, 6, and 7 are from the bed C. The casts 
Nos. 8 and 9 are of stones taken from the same quarry by the workmen, but 
they informed the author that the original of No. 9 
was found below bed A, and was a bottom stone. 
The impressions in the three beds take the same, 
or nearly the same, direction. 
The impressions seen in the casts 1, 3, and 5 
appear to be those of similar animals, which evi- 
dently used their fore feet simply as supports, while 
throwing the weight of their bodies mainly on their 
hind feet, which when in motion over-reached the 
impressions left by the fore feet. Nos. 2 and 6 to 
all appearance do not exhibit the same character, the 
impressions being probably those of a single foot; 
those on No. 6 would appear to be the impression of LOOKING S.W. 
a pad and three digits. The impressions on No. 4, 
being of more uniform depth, would appear to have been made by an animal 
which threw its weight pretty equally on all four feet. The impressions on 
No. 7 appear different again, and to have been those of a much smaller animal. 
It is important to note that the impressions Nos. 5, 6, and 7, being all different, 
occur on the same stone. The impressions on No. 8 are from their position 
very different to any of the others. It seems doubtful whether each impres- 
sion on No. 9 is that of a single foot, or whether it is not rather that of both 
the fore and hind feet nearly in coincidence. The appearance of a double row of 
toes and the abnormal number of six digits visible in some impressions probably 
arises from the placing of the hind foot nearly in the impression left by the fore- 
foot ; or, again, the impression may represent the pad and toes of a single foot. It 
is of interest to note the variety of forms of animal life represented in the present 
specimens, a variety that compares very favourably with the small range of forms 
represented by the impressions hitherto obtained from rocks higher in the series. 
It has been suggested that these represent the vestiges of at least several different 
species, if not of different genera, of extinct vertebrates. 
I had, previously to this, found an impression (No. 10) in the higher number of 
the same series overlying the magnesian limestone, and known as the St. Bee’s 
sandstone, about a mile south-west of the village of Hilton, on the road to 
Appleby. It was not zm situ, but a subsequent visit to the same place convinced 
me that it must have been quarried from a quarry on the spot. The same quarry 
has yielded several stones exhibiting desiccation-marks and also portions of foot- 
prints. 
7. Archeastacus Willemesii, a New Genus of Eryonide. 
By C. Spence Bate, F.R.S. 
The species of Eryon hitherto described seem to belong to separate genera, as 
different from one another as from some recent forms. 
The specimen now described is from the Lower Lias of Lyme Regis, and it 
seems to connect the fossil forms with those recent ones brought to light, through 
deep-sea exploration, more than any other form does, 
The animal appears to have had no eye, but the presence of an orbital concavity 
shows that it has retrograded from a species in which the eye was an important 
feature. 
The genus is allied to Polycheles, which it resembles as much as it does the 
ancient Eryon. 
It seems, therefore, that Eryon has departed from an unknown ancestor of Astacus, 
and that the recent Polycheles is in direct descent from the Liassic Archeastacus. 
