228 NATURAL SCIENCE [October 
in practically the same way as the former, with the addition of a 
bibliography, and deals with that important series of shells obtained 
by the late John Brown of Stanway at Copford, as well as series 
from many other deposits. The mere mention of Grays, Ilford, and 
Clacton, as some of these other deposits, will show at once the special 
interest of the paper to London geologists and conchologists. 
Among the more interesting notes given to us is the confirmation 
of the rarity of Helix hortensis in a fossil state; the absence of H. 
pomatia ; the occurrence of H. aspera in the Lea Valley; the 
elimination of Hulota fruticum from the recorded fauna of Copford ; 
the restriction of the distribution of Pomatias elegans; and the 
observation as to the increased size of Helicella caperata since 
Pleistocene times. 
We have now a great advance in our knowledge of the geo- 
logical history of the non-marine mollusca of our home district ; 
and though some of the names in Messrs Kennard and Woodward’s 
list may be a little startling to the uninitiated, we are glad to see a 
possible termination of the confused nomenclature which has 
prevailed for so many years. 
TRIASSIC CEPHALOPODA 
THE description of Triassic Cephalopods occupies an important part 
of the recently-issued volume of the Denkschr. d. k. Akad. Wissensch., 
Wien. Franz v. Hauer, who has been contributing to the literature 
of Triassic Cephalopods for more than thirty years, and although 
now considerably past his threescore years and ten, furnishes a 
paper on the Trias Cephalopods of Bosnia. This author has already 
described Triassic Cephalopods from this region, but he now records 
from a new locality both Nautiloids and Ammonoids, among the 
latter being the new genus Bosnites. Dr E. von Mojsisovics, so 
well known for his work on the Trias Cephalopods, contributes a 
very important paper on the Upper Triassic Cephalopod-fauna of 
the Himalaya. It is based not only upon the older collections 
made by Strachey, Stoliczka, and Griesbach, but also upon the rich 
collection obtained by Messrs Griesbach, Middlemiss, and Dr Diener 
during their expedition into the Central Himalaya in the year 
1892. As was to be expected, many new species are described and 
not a few new genera are proposed. The author points out that 
there is a marked contrast between the Upper Triassic fauna of the 
Indian province and the homotaxial fauna of the Mediterranean 
province, but he believes there was a sea connection between the 
two regions during Upper Triassic times, and is of opinion that an 
examination of the intervening districts will probably render the 
provincial character of these two regions less apparent. 
