366 Royal Society .—Letters from the 
With regard to freshwater fish, there are said to be four 
kinds, viz. :— 
1. A species of perch, commonly called carp here. 
2. A species of eel, in most points agreeing with Anguilla 
marmorata, but differmg in one important point at least. It un- 
doubtedly enters the streams here, as the specimen which I have 
was caught about a quarter of a mile above the place whence we 
get our drinking-water. 
3. A species of Hleotris, a specimen of which was caught at the 
same place as the eel. This fish, however, undoubtedly enters 
brackish water. 
4, A species of Mugil. I have my doubts as to whether this 
fish can really be called a freshwater species. 
With regard to the Arachnida, I have collected a considerable 
quantity of spiders, and have got specimens of the small scorpion 
which is very fairly common on the island. 
A large Scolopendra is very common; but a small species is not 
so, and | have only succeeded in procuring one specimen. 
I have collected a very considerable quantity of insects, more 
especially of the order Coleoptera. 
Peripatus I have not been able to find, though I have made 
diligent search for it. 
There are two species of land-crab, both of which I have pro- 
cured. 
I have only been able to find one very minute species of fresh- 
water sponge, which seems to be veryrare. I have only found two 
small specimens, which, however, came from two streams in widely 
different parts of the island. 
The Vermes are not numerously represented on the island. 
There are one or two species of Lwmbricus. There are no leeches 
in the streams, nor are there planarians either there or on land. 
There is, however, a beautiful nemertine, which I have found under 
stones and wood in damp places. I have also found a species of 
Gordius in a stream. Believe me, 
Yours truly, 
The Secretary RS. GEORGE GULLIVER. 
P.S.—I do not send any specimens home at present, as, bemg 
nearly all in spirit, they still want attention, and it is also neces- 
sary for me to keep specimens by me, in order to ascertain whether 
I have already got specimens which I may find. 
Rodriguez, November 1874. 
Str,—lI send by the ‘ Shearwater’ to-morrow, for transmission 
by the mail leaving Mauritius on the 12th instant, a packet of seeds ° 
of some of the plants of this island; and, in accordance with my 
instructions, I submit the following short report of my proceedings 
here up to the present date. ; 
