ANTHOSOMA. 
297 
own specimens to be identical with his Anthosoma, though 
the figure given in the work quoted above was so bad as 
to make it almost impossible to identify it from that alone. 
In 1826 Risso described it again in his ‘Hist. Nat. Eur. 
merid./ under the name of Otrojohesa imbricata , giving 
Leach as his authority for the generic name ! 
Lamarck retains the name of Caligus, but Latreille, 
Kroyer, M. Edwards, and other authors, have adopted the 
genus, though only one species has as yet apparently been 
described, unless the species described by Abildgaard 
may be considered different. 
Anatomy and Physiology , 8fc . — The general form of 
the animal is oval ; and we distinguish as usual the head, 
thorax, and abdomen. 
The head is of tolerable size, and distinct, consisting 
of a stout, rather narrow, and strongly convex, horny 
buckler of an ovoid shape. It is very narrow, thick, and 
obtuse in front, where it has a furrow running across its 
dorsal surface, and a deep notch on each side, which thus 
forms a beak, and almost divides it into a separate seg- 
ment. It extends backwards for some length, and becomes 
considerably broader, covering a portion of the thorax. 
The segments of the thorax are very indistinct. On 
the dorsal aspect we perceive two foliaceous elytraform 
appendages of an oval shape, and of a light horny and 
somewhat granulated texture. Beneath these the remain- 
ing portion of the thorax is seen, of a fleshy structure, 
and apparently without any divisions. 
The abdomen is very small, consisting of one short 
segment, which gives off two small caudal appendages, 
in form of short, flat, blunt filaments of the same texture 
as the elytraform appendages. Immediately beneath the 
notch, on each side of the blunt beak, we see a small, 
flat body, and from near the base of each of these we 
find the origin of the antennae. These organs are rather 
long and slender, and consist of six articulations, tapering 
from the base to the extremity. 
