ANTHURID®. 155 
ISOPODA, ANTHURID. 
ABERRANTIA. 
Fam.—ANTHURIDA. (Anthurade—Leach.) 
THE animals in this family are very long and slender, 
the head distinct from the pereion, the antennz very short 
and nearly equal in length, the first pair of legs large 
and subchelate, the remaining six pairs nearly equal 
in size and uniform in shape, the pleon furnished with 
biramose squamose appendages, terminal pair of pleopoda 
transformed into a pair of scale-like appendages at each 
side of the terminal joint. 
The head is nearly oval, with the eyes small, oval, 
formed of but very few lenses, and placed near the 
anterior angles of the head, behind the antenna, which 
are very short and gradually attenuated to the tip. In 
. the figures in page 160, they are represented as they 
appeared to us under a lens, in the very ill-preserved 
type of the genus, originally described by Montagu, 
now in the British Museum. In specimens preserved 
in spirit of a second species, contained in the Hopeian 
Collection, the upper pair are placed a little apart at 
the base, whilst the lower pair, which are the most 
robust, arises close together, their basal joint being por- 
rected and brought into contact with each other along 
their inner edge, thus forming a protection from above 
to the oral organs. The upper pair of antennz are 
composed of a three-jointed peduncle and a four-jointed 
flagellum, the terminal joint furnished with a long pencil 
of hairs at the tip. The lower, and more robust pair, 
consist of five joints, of which the second and third 
are shorter than the first and fourth; the terminal joint is 
conical, and furnished at its tip with a pencil of hairs. 
