r 
460 Messrs. T. and A. Scott on some 
slender subequal spines (fig. 15); the secondary branch is 
somewhat subcylindrical, the breadth is about two thirds of 
the length, and it is furnished with two sete on the inner 
margin and four on the truncate apex (fig. 15). Spermato- 
phore large. 
Habitat. Pools above high-water mark near the head of 
West Loch Tarbert, Argyleshire; not very common. 
Remarks. There seems to be little doubt that this is a 
variety of Canthocamptus palustris, Brady ; it agrees with 
that species in several of its more important characters, such 
as the general structure of the antennules and of the first and 
fifth thoracic feet of the female ; the second, third, and fourth 
pairs of thoracic feet are also similar to those of that species. 
‘The chief differences, on the other hand, are these :—(1) the 
secondary branches of the antenne of this variety are only 
one-, instead of two-jointed; (2) the proportionally shorter 
second and third joints of the inner branches of the first’ 
thoracic feet ; and (3) the structure of the fifth pair in the male. 
In the male fifth pair the secondary joint is comparatively 
large, being elongate and subcylindrical. 
Laophonte propingua, sp.n. (PI. XVII. figs. 1-9.) 
Description of the Species—Kemale. Length *72 millim. 
(about >of aninch). Body elongate, depressed; rostrum broad 
and with a minute seta on each side of the bifid apex (fig. 2). 
Antennules seven-jointed; the second and third joints are 
considerably longer than the others, and the second joint is 
also dilated and armed with a strong conical tooth on the 
external aspect (fig. 3). The proportional lengths of all the 
joints are nearly as follows :— 
Proportional lengths of the joints... 17.22.28. 
Number ‘of the:jdinis \)..... 0.2... lise 
ise: 
Ba 
6. 5; 
4 5 
Antenne strong; both the first and second joints are fringed 
with small sete on the inner edge ; secondary branch small, 
one-jointed (fig. 4). The second joint of the posterior foot- 
jaws 1s somewhat dilated and bears a powertul terminal claw. 
The inner branches of the first pair of swimming-feet are 
very strong; the first joint is of considerable length, being 
five times longer than broad, but the second is very short and 
is armed with a strong claw; the outer branches are slender, 
three-jointed, and about half the length of the first joint of 
the inner branches; the second basal joint is also densely 
hirsute, as shown by the drawing (fig. 6). ‘he second pair 
