104 MR. F. E. BEDDARD ON ISOPODA COLLECTED [ Feb. 2, 
region is straight. The epimera are fused with the tergum in the 
first thoracic segment, elsewhere distinct but small. The abdominal 
shield is as long as the three last segments of the thorax ; it is 
subquadrangular in outline. The antennules have four basal joints 
and a long flagellum, longer than the peduncle. ‘The antenne are 
furnished with a rudimentary exopodite. The mandibles have a palp. 
The first pair of thoracic limbs are extremely long and prehensile ; 
the remaining thoracic limbs are slender and short, they terminate in 
twoclaws. The wropoda are biramose, the endopodite and exopodite 
being equal. 
Station 320; 600 fathoms. 
IOLANTHE, nov. gen. 
This genus appears to be closely allied to Acanthoniscus, Sars, 
with which it agrees in the absence of eyes and in the presence of long 
spiny epimera and long dorsal spines, and in the shape of the uropoda. 
It differs in that the thoracic appendages are biunguiculate and in a 
number of other points, which may be gathered from the following 
description of the single species referable to the genus. 
1. IoLANTHE ACANTHONOTUS, 0. sp. 
This species is founded on a single female dredged in deep water 
in the Antarctic Ocean. It measures 24 millim. in length. 
The head is as wide as the succeeding segment of the thorax ; its 
margins are prolonged on either side into two spines, of which the 
anterior is much the longest; the anterior margin of the head is 
produced into a long rostral spine, which is curved slightly upwards. 
There is no trace of eyes. The thoracic segments are subequal in 
antero-posterior diameter; in the dorsal-median line of all the 
segments is a stout long vertical spine ; the lateral margin of the 
first segment is furnished with a long spiny process; on each of the 
three succeeding segments are two such spines, the anterior being 
the longer; in the remaining segments only the anterior spine is 
present. These spines are not outgrowths of the epimera, which are 
small and lie beneath them. The abdominal shield is almost circular 
in form ; on either side are three spines arranged at equal distances, 
which are much shorter than the lateral spines of the thorax. The 
antennules have a four-jointed peduncle, of which the second joint is 
the longest. The flagellum consists of 24 joints, and is about as long as 
the three distal joints of the peduncle. The antenne are half the 
length of the body ; the second joint of the peduncle has a spiny 
process on the outer side as in Janthe, which corresponds (?) to the 
exopodite ; the flagellum is nearly as long-as the peduncle. The 
mandibles have a palp. The thoracic appendages are all similar to 
each other and terminate in two claws. The wropoda have a very 
long proximal joint ; the endepodite is extremely short, though larger 
than the minute exopodite. 
Station 153; 1675 fathoms. ~ 
