ANTHURA. 159 
extending beyond the front of the head; the hand is 
ovate, protected at the base of its inner margin by the 
produced extremity of the preceding joint; the finger is 
strong, and terminated by a distinct unguis. The six 
other pairs of legs are much more slender and simple, 
terminated by a short, rather strong, curved finger, and a 
distinct terminal unguis. 
The very elongate and slender form of the animals 
of this genus gives them a certain amount of resem- 
blance to the species of Arcturus, and has led to their 
being placed in the family of which Idotea is the type; but 
Dr. Leach long ago had the tact to perceive their claims 
to form a distinct family, and, although their general 
form, short antenne, and strong fore legs, give them a 
certain similarity to Tanais, yet we apprehend (now that 
their real structure has, for the first time, been described 
from a minute analytical examination of their oral 
organs) that their true affinities will be admitted to be in 
the immediate neighbourhood of the A#gide, one species 
of which at least, Conilera cylindracea, approaches them 
in its elongated cylindrical form; indeed, Dr. Leach 
suggested that this animal might possibly be referable 
to the family Anthuride, and, accordingly, in Mr. White’s 
catalogue of British Crustacea, it is placed as a second 
species under the name of Anthura cylindrica, appearing 
again in a subsequent page, in its proper place and name, 
as Conilera cylindracea. 
. 
