52 C. BOVALLIUS. ASELLIDA. 
pereiopoda are provided with tri-unguiculate dactyli(?), the 
outer claw much longer and stouter than the two inner. The 
pleon is as long as the last three pereional segments; nearly 
as long as broad. The uropoda are almost as long as half 
the pleon, the rami shorter than the peduncles. 
Colour. .? 
Length. 3 mm. 
Hab. Nassau Bay, Tierra del Fuego. Parasite on Spheroma 
lanceolata. 
Judging from the figure given by DAna 1. c. I suppose 
that the animal mentioned above must be placed in the new 
genus Iais; in the description DANA says nothing about the 
tri-unguiculate character of the pereiopoda. 
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