462 Part L11.—Twentieth Annual Report 
of six joints. The secondary branches of the antenne (posterior antennze) 
are small and two-jointed. Mandibles stout, mandible-palp well 
developed and provided with two branches, Other mouth organs similar 
to those in Mesochra and Cletodes. ‘The first four pairs of thoracic feet 
have the outer branches three- and the inner branches all two-jointed. 
Fifth somewhat rudimentary and composed of a single lamelliform joint. 
Ovisacs apparently double. 
Pseudomesochra differs from Mesochra, Cletodes, and allied genera 
chiefly in the structure of the mandible-palp and fifth pair of feet. 
Pseudomesochra longifurcata, T. Scott (sp. nov.) Pl. XXIV., figs. 27-35. 
Description of the Female——Length about ‘5mm. (3; of an inch). 
Body moderately stout, tapering slightly towards the posterior end ; 
abdomen not distinct from thorax ; rostrum small; caudal furca elongated, 
being nearly equal to the entire length of the last three abdominal 
segments (fig. 27). 
Antennules short, moderately stout, and composed of six joints, the 
first two and the last being each considerably longer than any of the 
other three (fig. 28). The approximate proportional lengths of the 
various joints are shown by the formula :— 
Proportional lengths of the joints, - 23 *20:8:5:4:15 
Numbers of the joints, - : oe D258 E43 EG 
The antenne are of moderate size; secondary branches two-jointed and 
provided with several marginal and terminal sete (fig. 24). 
Mandibles robust and having the biting end armed with several stout 
teeth ; mandible-palp well developed and the basal part furnished with 
two branches (fig. 30). 
Second maxillipeds short and moderately stout, but the terminal 
claw is rather feeble, and fringed with a few minute hairs (fig. 31). 
The first four pairs of thoracic feet slender. In the first pair both 
branches are about the same length ; the joints of the inner branches are 
sub-equal, and a single seta springs from the inner margin and three from 
the end of the second joint, the proximal joint appears to be unprovided 
with setz or spines (fig. 32). In the second, third, and fourth pairs the 
inner branches in each are rather shorter than the outer branches, and 
the end joints somewhat longer than the proximal ones, and in these 
three pairs of feet the inner branches are more setiferous than the inner 
branches of the first pair (fig. 33). The fifth pair, which are small and 
somewhat rudimentary, appear to be composed of a single lamelliform 
joint, bearing three long apical setze (fig. 34). 
Habitat.—Upper Loch Etive, where it was dredged by the “‘ Garland ” 
in over 60 fathoms on September 17th, 1901. It appears to be a rare 
species, as only a single specimen (a female) was observed, but as the 
Species is a very small one it may be easily overlooked. 
Leptopontia, T. Scott (gen. nov.). 
Body slender and cylindrical. Antennules (anterior antenne) seven- 
jointed, slender. The secondary branches of the antenne are entirely 
wanting or reduced to a single seta. Mandibles slender and moderately 
elongate; mandible-palp also slender and one-branched. Other mouth 
organs somewhat as in Mesochra, Boeck. The first four pairs of thoracic 
feet slender, outer branches three- and inner branches all two-jointed. 
The inner branches of the first pair elongated—the end joint being the 
shortest, the outer branches short, the inner branches of the other three 
pairs very short, and the outer elongated. Fifth pair small, foliaceous, 
two-branched ; secondary branches (or joints) minute, 
