124 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 
tion ; but under what circumstances this could have taken place, and 
whether before or subsequently to the deposition of the laterite in 
the low country of Goozerat, does not seem to have been inquired 
into. The inquiry may be recommended to Indian geologists as 
one of great interest. 
P.S.—Since writing the foregoing remarks on the probability of 
the Indus or some large river from the north having once found its 
way into the Gulf of Cambay, I have seen quotations from Prof. Max 
Miiller’s translation of the Vedas, which prove that at the time 
some of them were composed, the Suruswuttee, the most easterly of 
the Punjaub rivers, which now loses itself in the desert of Rajpootana, 
flowed into the Indian Ocean. This confirms to some extent the 
theory of the cause of the alluvial deposit at the head of the Gulf 
of Cambay. 
3. On the RopEntia of the Somerset Caves. 
By W. A. Sanrorp, Esq., F.G.S. 
(Read June 23, 1869*.) 
[Puate VIII. ] 
Havine recently examined the collection of Rodentia from the So- 
merset Caves in the Taunton Museum, I find that several of the 
specimens cannot be referred to species which have hitherto been 
considered members of the fauna cotemporary with the Mammoth 
(Elephas primigenius) in Britain. 
1. Genus Arvicola.—As usual, bones and teeth of one or the other 
of the closely allied species, or perhaps varieties, which are about the 
size of, and have a dentition similar to that of Arvicola amphibius, 
abound in the Somerset Caves; but they are all fragmentary, and, as 
the observed differences between these species principally depend on 
the proportions of different parts of the animals, and not upon differ- 
ences of form of the parts themselves, it is useless with our present 
materials to attempt to determine to which of these forms the fossils 
belong; it will be convenient to class them, as hitherto, as the bones 
of our common Water-rat (Arvicola amphibius, Linn.). 
2. Arvicola glareolus (Schreber)=pratensis (Baillon)}=riparia 
(Yarrell), appears to be a rare cave animal. We have never met 
with but two jaws; one of them is from Hutton Cave, and is in the 
Taunton Museum. 
3. We have met with several lower jaws the dentition of which 
is identical with that of Arvicola agrestis (Linn.); but the diastema 
between the molars and incisor is longer, and the lower jaw itself is 
straighter in this part than in the recent jaws with which we have 
compared it. In this the jaws approach Arvicola ratticeps (Blasius) ; 
but we do not regard the difference as other than varietal. 
4. Among the bones hitherto referred to Arvicola agrestis we 
* See p. 444 of the last volume. 
