492 REPORT— 1883. 
5. Report on the Exploration of Raygill Fissure, Yorkshire — 
See Reports, p. 133. 
6. On the Occurrence of Remains of Labyrinthodonts in the Yoredale Rocks 
of Wensleydale. By James W. Davis, F.G.S. 
Prof. Miall has described the bones of a portion of the hind limb of a labyrin- 
thodont in the ‘ Quart. Journal of the Geological Society,’ vol. xxx. p. 775. They 
were found in a dark-coloured flag-rock above the Harmby Quarry and extending 
with an easterly dip to Harmby Railway-Cutting. The same flag-rock extends 
behind Leyburn and the Shawl, and in that locality it has been extensiv ely quarried. 
In addition to the leg-bones already mentioned others have been found in the same 
flag-rock, but separated by considerable distances, so that it is not probable that 
they belonged to the same labyrimthodont. In the railway-cutting a portion of a 
cranium was found, It is 1-9 inch in length and 1-4 in breadth, Its thickness 
is ‘15 of an inch and is of a somewhat open and porous structure. A longitudinal 
depression extends completely across the upper surface, on each side of which, and 
parallel with it, is a well-developed convexity. A number of sutures, not very ” well 
defined, seem to indicate that the bone occupied a position in the skull probably 
between and immediately behind the orbits, and extending backwards to the 
occipitals, comprising the frontals, parietals, part of the occipital, and a portion of the 
squamosal bones. ‘he under surface is coarsely striated and porous, corresponding 
generally to the upper surface. 
The third specimen was found in the quarries beyond the Shawl N.W. of Ley- 
burn and exhibits casts of the jaws of a labyrinthodont, Each ramus is about 
3 inches in length; they have been disturbed and displaced. The rami at a dis- 
tance of 1 inch from the posterior extremity are ‘5 of an inch in depth, beyond 
which they gradually taper to the anterior extremity. The external surface of the 
jaws was ornamented with a reticulated arrangement of tubercles, an impression 
of which is preserved in the specimen. Along the margin of the impression of 
the alveolar portion of one of the rami there is a series of impressions which 
appears to have been caused by small pointed teeth. The specimens are perhaps 
too fragmentary to afford sufficiently good characters on which to base determina- 
tions of specific or even generic value; and the wide dispersal of the bones, though 
in the same stratum, renders their aflinity problematical. 
7. On some Fossil Fish-Remains found in the Upper Beds of the Yoredale 
Series at Leyburn, in Yorkshire. By James W. Davis, F.G.S. 
The red limestone forms the upper part of the main limestone of Phillips, 
being separated from it by only i foot of shale or plate. It is about 100 feet be- 
low the millstone grits, the intermediate beds being composed of grits and shales, 
with one bed of limestone about 16 or 18 feet thick. A peculiar aggregation of 
fish-remains has been discovered in the red beds by Mr. Wm. Horne, of Leyburn. 
They comprise nearly forty species, the majority of which are peculiar to the beds; 
others, like Cladodus and Petalodus, are common to the mountain limestone, and 
do not appear to differ either in size or otherwise from those of the lower massive 
limestone. The representatives of the genera Psammodus, Cochliodus, and Poly- 
rhizodus, which are found abundantly in the lower limestone, and are of great 
size and importance, are in this locality comparatively small and rare, and appear 
to indicate that the fishes they represent were gradually becoming extinct. ‘Their 
representatives are not known to occzr in the superimposed millstone grits either in 
this locality or in any other. There are in addition species of the genera Mega- 
lichthys and Pleurodus, which are characteristic of the coal measures. The presence 
of so varied a fauna naturally leads to the inference that the circumstances under 
which they existed were not those usually characteristic of the aggregation of lime~ 
stones, but rather indicate a shallow or shore deposit with occasional influxes of 
