284 IONE CORNUTUS. 
cox of the four anterior pairs of the pereiopoda 
are round, and all attached to the antero-lateral 
margin of the segments of the pereion. The 
cox of the three posterior are the larger, and 
produced posteriorly to a point. The pleopoda 
are long, and fringed with arborescent branchiz. 
This is the only species known, besides that 
taken by Colonel Montagu on the southern coast 
of England. 
Length, male, +; female, ? of an inch. 
Taken attached to the branchia of Callianassa 
longimana. 
My mission in North-western America is ended. 
The Hudson’s Bay Company’s steamer ‘ Labou- 
chere’ takes us to San Francisco, where we spend 
a very pleasant week, and I meet with many old 
friends, whom I had encountered mule-hunting. 
The mail-steamer takes us to Panama, where we 
have to remain a short time, to await the arrival 
of the English steamer at Colon. Panama has 
been so often described, and is so frequently 
visited nowadays, that any description of mine 
would be a repetition of what others have 
better said. 
I will content myself by saying we reached 
home safely and in admirable health. If I have 
