446 Mr. C. Spence Bate on some Atlantic 
I obtained several species of marine Crustacea while at Rio. 
In an excursion which I made along the beach outside the 
harbour, I saw many specimens of an Ocypoda, but only suc- 
ceeded in capturing one, owing to the extreme rapidity of 
their movements; and on another occasion I obtained speci- 
ree of a Lupea, a Hepatus, and a Hippa, in Five-fathom 
ay. 
In the month of September the screw of the vessel was raised 
in order to clean it, and found numbers of Caprella[ App., VIII. ] 
clustering amongst the tufts of zoophytes with which the 
metal.was profusely covered. I send you specimens of this, as 
well as of a crustacean * which has occurred in plenty in the 
towing-net several times in the course of our voyage south- 
wards to the Strait. We expect to enter the Strait in the course 
of a couple of days, and shall be there and in Smyth’s Channel 
for six or seven months, after which we shall probably spend a 
few months at Valparaiso. If you have leisure to write me a 
few lines, it will be doing me a great favour; for lam very much 
cut off at A sae pe as you may imagine, from scientific intelli- 
gence. My address will be “ H. M.S. ‘ Nassau,’ Valparaiso, 
vta Panama.”’ 
With kind regards, believe me, 
My dear Sir, 
Very truly yours, 
Rosert O, CUNNINGHAM. 
Appendix. By C. Spence Bate. 
I. Alima hyalina.—From researches made by Dr. Power 
during his stay in the Mauritius, and which are now in my 
hands preparatory to publication, I have great reason to be- 
lieve that the genus Alima is but the second stage in the de- 
velopment of the genus Sguzlla and its allied forms. 
II. Ligia.—No species (that I am aware of) has been re- 
corded from the eastern coast of South America. It may 
therefore be L. Baudiana of Milne-Edwards, from the Gulf of 
Mexico, which bears a very near general resemblance to the 
British species. The habitat, however, is very remarkable ; 
for the European species is never found in water, but only 
within reach of the spray of the sea. 
III. Jdotea annulata, Dana (Pl. XXI. fig. 1)—The deep 
blue colour of; which Dr. Cunningham speaks appears to be 
a peculiarity belonging to pelagic species. I have received 
specimens of this same from Dr. Wallich, who says that it “is 
a parasite on Physalia, almost invariably adherent to the 
* Idotea annulata. 
