544 Mr. L. A. Borradaile on the 
Genus Bierna, Nardo, 1869. 
Definition: “ Upogebiinz with the legs of the second pair 
chelate and all the rest simple.” 
It is somewhat remarkable that this genus is only known 
by an old drawing, but there seems to be no reason to 
doubt its existence. 
Species : 
Type. B. tipica (sic), Nardo, 1869. Ann. Ist. Venet. xiv. B. 
Subfamily Cazzrrawassrva, uo. 
Definition: ‘ Callianasside with the rostrum small or 
almost wanting; the legs of the first pair chelate, unequal, 
the larger one usually with a very broad wrist and palm, 
those of the second pair equal, chelate, those of the third 
pair with a broad propodite; mastigobranchs present or not 
on the hinder thoracic limbs, but always a large one on the 
first maxilliped; and the second pair of abdominal limbs like 
or unlike the third to fifth, which have an appendia interna.” 
Genera: Callianassa, Glypturus, Callianidea. 
Genus Cauuianassa, Leach, 1814. 
Definition : “ Callianassinz with the eyes flattened against 
one another (except in Scallasis), the ischiopodite and mero- 
podite in the maxillipeds of the third pair broader than the 
carpopodite and propodite; the third pair of legs usually 
bearing a lobe on the hinder edge of the propodite, which 
thus takes on a characteristic shape; those of the fifth pair 
more or less distinctly subchelate ; no mastigobranchs on the 
legs or third maxilliped, but a large one (epipodite) on the 
first and usually a small one on the second, no gill-like 
filaments on the third to fifth pairs of abdominal limbs, and 
the plates of the tail-fin not deeply graven.” 
The species of this genus are so many that it would be well 
if they could be grouped in subgenera. Unfortunately this 
is far from easy, partly because so little is known about most 
of them. In the following arrangement the characters made 
use of are the shape of the maxillipeds of the third pair 
and that of the tail-fin, on which great weight was laid by 
A. Milne-Edwards in his revision (Nouy. Arch. Mus. vi.), 
and the propodite of the legs of the third pair, which is 
needed for some species that have become known since he 
wrote. The most primitive members of the genus are those 
with a long narrow telson, narrow third pair of maxillipeds, 
and oyal propodites on the legs of the third pair, such as 
