Notices of Memoirs—E. T. Newton—Triassic Reptiles. 559 
the percolation cannot be less than about 20 inches per annum, 
giving a supply of about 1,000,000 gallons to every 3 square miles. 
Taking the area of the formation between Nottingham and Worksop 
at 120 square miles, the amount of water which annually percolates 
into the rock and becomes a reservoir of supply may be estimated 
at about 40,000,000 gallons per day. 
This large quantity of water tends to flow eastwards, following 
the dip of the beds; and that it has permanently saturated the 
Bunter Sandstone under an extensive area occupied by the over- 
lying formations is proved by the result of the boring at Scarle, 
near Lincoln, which, commencing in the Lower Lias, passed down 
through the Keuper marls into the Bunter, when the water came 
up with force and flowed over the surface.! This boring is at a 
minimum distance of 20 miles from the margin of the Bunter 
Sandstone. From these considerations it may be inferred that 
Nottingham is most favourably situated as regards its water-supply 
for a long period to come—a circumstance of great importance at 
a time when so many large manufacturing towns aré looking 
forward with anxiety to the future as regards this prime necessary 
of.progress and prosperity. 
Since the above was written I have been favoured by Mr. L. 
T. Godfrey Evans, the Borough Engineer, with information, of 
which the following is a summary :— 
There are four pumping stations, of which one, the Park, Zion 
Hill, is not now in use. The others,are :— 
1. Basford or Bagthorpe, yielding 12,800,000 gallons per week. 
2. Bestwood, _ yielding 11,800,000 ,, He 
8. Papplewick, yielding 12,190,000 ,, i 
In all 36,790,000 gallons per week, or 5,257,143 gallons per day. 
The supply at Bestwood is decreasing, owing probably to mining 
operations in the neighbourhood. The yield at the Park Station 
is about 53 millions of gallons per week. The water is excellent. 
VIII.—On tHe Repritia oF THe Britisu Trias. By H. T. Newron, 
F.R.S., F.G.S. 
HIS communication is a review of our knowledge of the reptiles 
which have been recorded from the Triassic strata of Britain. 
In the first place attention is called to the teeth from Durdham 
Down, Bristol, described by Riley and Stutchbury, in 1836, under 
the generic name of Palgosaurus and Thecodontosaurus, which, with 
additional specimens, were further described by Professor Huxley in 
1869, he regarding them both as dinosaurian. The two genera are 
distinguished by the form of their teeth. Closely allied to Palgosaurus 
is the tooth described by Murchison and Strickland in 18387 as 
Megalosaurus, but.subsequently named Cladyodon by Owen. Another 
and still larger tooth, from the same neighbourhood, has been referred 
by Professor Huxley to Teratosaurus (=Zanclodon): it is very 
1 Two feeders of water were struck—one at a depth of 917 feet in the Lower 
Keuper Sandstone, and the other at 1,250 feet in the Bunter Sandstone. 
