632 Geological Society. 
condition, the bones being quite undistorted. The clavieular areh 
is large and well developed, being very similar in type to the elavi- 
cular arches of some Lower Liassic forms. It is suggested that 
the retention of this primitive condition in this, and perhaps in 
some other Wealden Plesiosaurs, may be the consequence of their 
comparatively-sheltered life in a fluviatile or estuarine habitat. 
Similarly, in the case of the Platanistide among the Whales, 
analogous conditions of life seem to have led to the persistence 
of primitive characters. 
It is proposed that this new species of Plesiosaur shall be made 
the type of a new genus, Leptocleidus, its specific name being 
Leptocleidus superstes. 
The shoulder-girdles of two species of Lower Liassic Plesio- 
saurs are also described and figured, and the generic name Hwry- 
cleidus is suggested for these, the type-species being Hurry clei- 
dus arcuatus (Owen) from the Lower Lias of Street (Somerset). 
2. ‘The Carboniferous Rocks of the Deer-Lake District of 
Newfoundland.’ By Thomas Landell-Mills, F.G-.S., Arthur Smith 
Woodward, LL.D., F.R.S., Pres.L.8., F.G.S., and Albert Gilligan, 
D:Se:, B.Se., E/G:S. 
The Carboniferous rocks form a synclinal flexure with its 
longer axis trending north-east and south-west. Underlying 
these is a limestone series of undetermined age (but probably 
post-Cambrian and pre-Carboniferous), which rests on highly- 
folded gneisses and schists of Archean age. 
A thick mantle of Pleistocene deposits covers the whole region ; 
but deeply-trenched valleys give good exposures of the Carboni- 
ferous rocks, and the following sequence has been determined :— 
TS Che ee The Humber Grit Series, consisting: of alter- 
2000 feet - nating beds of conglomerates, grits, sand- 
stones, and marls. 
LoweR CARBONIFEROUS— [ (2) Upper or Grey Shales. 
4.000 feet (about) | (1) Lower or Red Shales. 
Fishes and plant-remains occur abundantly at several horizons 
in the Lower Carboniferous shales, but no fossils have been found 
in the Upper Carboniferous. 
The mineralogical constituents of these deposits show a remark- 
able resemblance to those making up rocks of similar age in the 
North of England. It is inferred that the deposits on either side 
of the Atlantic were derived from the same land-mass. The fish- 
remains from Deer Lake, described by Dr. A. Smith Woodward, 
are all fragmentary; but they seem to represent three species 
closely related to those found in the Lower Carboniferous of 
Scotland. A group of ribs with the caudal fin and scattered 
scales belongs to a Dipnoan fish, which may be referred to a new 
species of Uronemus. Some specimens of a Paleoniscid fish are 
sufficiently well preserved to show that they belong to a new species 
of Elonichthys. Other scattered Palieoniscid scales seem to belong 
to Rhadinichthys. 
