im) 
O18 A HISTORY OF RECENT CRUSTACEA 
the second pleopods. Janthe speciosa, Bovallius, is by 
Hansen identified both generically and specifically with 
the earlier Janira spinosa, Harger. Janira abyssicéla, 
Beddard, was obtained among the Fiji Islands, from a 
depth of 1,350 fathoms; Janira laciniata, Sars, from 
400 fathoms on the west coast of Norway. Janira tricornis 
(Kréyer) comes from Greenland. 
Trichopleon, Beddard, 1886, has a rudimentary exopod 
on the second antenne, the limbs of the perzeon with the 
seventh joint simple, the uropods with the outer branch 
one-jointed, the inner two-jointed. The type is Zrichopleon 
ramosum from the Philippines. 
Iathrippa, Bovallius, 1886, was instituted to receive the 
New Zealand species, Janira longicauda, Chilton, the genus 
being distinguished from Janira chiefly by the two 
branches of the uropods being long, laminar, and lanceo- 
late, instead of narrow and stiliform. 
Iais, Bovallius, 1886, is distinguisked by having the 
terminal joint of the limbs ‘triunguiculate.’ It has two 
elongate laminar branches to the uropods. The type is 
Iais Hargeri from the Strait of Magellan. 
[ Acanthoniscus|, Sars, 1879, differs from Janiva in 
having ‘the first legs not subchelate, the rest with the 
seventh joint simple, and the uropods stiliform with very 
short branches.’ The type species, Acanthoniscus typhlops, 
is blind. Dr. Bovallius having pointed out that the name 
Acanthoniscus is preoccupied, it may be changed to Acan- 
thaspidia. 
Ianthopsis, Beddard, 1886, was instituted to receive 
Tanthe Bovalli, Studer, from Kerguelen. It is allied to 
the preceding genus, but distinguished from it by having 
eyes, a rudimentary flagellum to the first antenne, and 
bifid fingers on the limbs of the perzeon. All the limbs 
are similar to each other in both sexes. The uropods have 
a long peduncle and two branches, of which the inner is 
the larger. 
Iolanthe, Beddard, 1886, is described as most nearly 
allied to the two preceding genera. It has no eyes, and 
the lateral margins of the head and the segments of the 
