194 
POPULAR SCIENCE REVIEW. 
section at Folkestone, the author considered it evident that the red chalk 
of Hunstanton was equivalent to the upper part of that formation. He 
mentioned that ten miles south of Hunstanton, in artificial sections, blue 
gault has been found resting upon the carstone, whilst rather nearer to 
Hunstanton the same place was occupied by a red clay, connecting the two 
dissimilar deposits; which, however, were shown by analysis to contain 
nearly equal quantities of iron. If the upper greensand be represented in 
the Hunstanton section, the author considered that its place must be in the 
band numbered 2, containing Siphonia paradoxica and Avicula gi'ypJicBoides. 
The Recent and Fossil Beaver . — Professor Owen states that a recent ex- 
amination of the bones of Castor and Trogontherium confirm his conclusion 
that the latter is ‘‘an extinct sub-generic type” of Castoridse. He has 
given some very good drawings of the bones of the Trogontherium. Vide 
Geological Magazine, February. 
“ Man and the Mammoth ” is the title of a very interesting paper in the 
above-mentioned journal, by Mr. Henry \Voodward, F.G.S. 
Hyperodapedon. — Professor Huxley has given the following description of 
this extinct lacertilian reptile : — “ The head presents indications of a bone 
forming a second zygomatic arch on each side ; the upper jaw is produced 
and bent downwards, forming a strong beak ; and the lower jaw is produced 
on each side of the symphysis into a pointed process, between which the 
decurved beak of the upper jaw is received. The maxillary and palatine 
teeth are arranged in rows, and present some resemblance to the large nails 
in the sole of a boot ; they are inserted on each side of the upper jaw upon 
the sloping sides of a deep grove, and are worn down and polished by the 
action of the mandibular teeth, which form a continuous and very close 
single seiies along the upper edge of the mandible. This peculiarity of ar- 
rangement enables the teeth of Hyperodapedon to be recognised wherever 
they may occur. The vertebrae have their centra slightly concave at each 
extremity. The other known parts of the skeleton are the ribs, scapula, 
coracoid, and part of the humerus, the pelvis, femur, and proximal ends of 
the tibia and fibula, and the abdominal false-ribs, which are largely deve- 
loped in this reptile.” 
The Officials of the Geological Society. — The following list of changes has 
been published : — 1. Mr. Henry M. Jenkins, F.G.S., who has for the past six 
years filled the post of Assistant Secretary, has been appointed to the position 
of Secretary and Editor to the Royal Agricultural Society of England. Mr. 
W. S. Hallas, F.L.S., who, during the past ten years, has been the Curator 
to the Yorkshire Philosophical Society’s Museum at York, has been elected 
to the post of Assistant Secretary, Librarian, and Curator, in the room of 
Mr. Jenkins. 2. Mr. Skertchl}', the Library Assistant, has resigned, in 
order to accompany Messrs. Rauerman and Lord to E^ypt. Mr. Frederick 
Waterhouse, second son of G. R. Waterhouse, Esq., Keeper of the Geological 
Department, Rritish Museum, has been elected in Mr. Skertchly’s stead. 
A Sandstone in course of formation was described by Mr. James Haswell 
at the meeting of the Edinburgh Geological Society, on January 21. This 
sandstone occurred at a point in the section of the Carboniferous strata be- 
tween Elie and St. Monance, near the railway bridge at Ardross. Resting 
upon the Carboniferous strata was a bed of tenacious clay containing recent 
