LEPTOCHELIA. 133 
determine the limits of that portion of the peduncle.* 
In the inferior pair the difficulty is still greater, for 
there are but five joints, the last being very rudi- 
mentary. In this respect this pair resembles that of the 
genus Tanais. The first pair of gnathopoda are very 
long, as long as (or much longer than) the superior pair 
of antenne. In both the species known, they have a 
large gaping chela, which Mr. Dana considers as a 
generic distinction, but which we think is very liable to 
specific variation. 7 
The only species hitherto referred to this genus is 
Leptochelia minuta, found among sea-weed and small 
corals in the Island of Ovalan, one of the Feejee group, 
the length of which is only one-tenth of an inch. 
* Tn the typical species described by Dana, the first joint is a very minute 
basal one, and the second very long. 
