ANONYX IIOLBOLLI. 
105 
which we have seen, the outline has been scarcely as 
defined as that given in our figure. In Kroyer’s beau- 
tiful plates in his “ Voyage en Scandinavie,” the form 
is given as wedge-shaped, slightly curved, the narrow 
extremity being uppermost, and the broadest down- 
wards, like an inverted comma (‘). The upper antennae 
have the first joint of the peduncle very long and stout, 
while the second is short and much narrower ; the third 
being scarcely visible, a portion only of it extending 
beyond the limits of the preceding ; the first articulus 
of the flagellum is very long, as long as all the others 
united, and is furnished upon the inner side with two 
longitudinal series of transverse rows of short hairs. 
It also supports at its extremity, upon the upper side, 
a bundle of auditory cilia ; the rest of the flagellum 
consists of but six or seven articuli : the secondary 
appendage is long and slender ; it is nearly as long as 
the flagellum, and consists of about eight articuli, of 
which the first is the longest. 
The lower antennse are about one-fifth the length 
of the animal, and as long again as those of the upper 
pair ; the peduncle is shorter than that of the upper 
antennae, and less stout ; the flagellum is long and slen- 
der, and has the articuli, of which it is composed, 
longer than broad. 
The mandibles are furnished with a plain cutting 
incisive edge, from near the base of which a row of 
minute curved hairs is continued, until they communi- 
cate, at the opposite extremity, with the molar tubercle. 
Each of these organs supports a very long three -jointed 
appendage, the second and third joints of which are fur- 
nished with hairs, increasing in length towards the distal 
extremity of each joint. 
The foot-jaws have the scale-like plate belonging to 
