29 NEW AND RARE SPECIES OF COPEPODA FROM SCOTLAND 
on the 25th of January 1894: there were several specimens 
of this form. On the 20th of August following, three species 
(two of which are described here), apparently belonging to 
the same genus, were obtained in the Forth, near Musselburgh 
—they were taken in pools on the shore, near low-water 
mark ; but these three species, though similar in habit and 
in general structure to the one obtained west of Queensferry, 
and for which the genus Leptopsyl/lus was instituted, differ 
from it in the following points :—1st, the mandible-palp is 
two-branched instead of one-branched—the distal branch 
being two-jointed, while the proximal branch, which is smaller, 
is one-jointed ; 2nd, the second and third pairs of swim- 
ming feet are two-branched—the inner branches, which are 
one or two-jointed, being more or less rudimentary. But 
notwithstanding these and one or two other minor differences, 
the Musselburgh species are, in our opinion, undoubtedly 
congeneric with that from west of Queensferry, and we there- 
fore prefer to amend the generic definition as published in 
part ili. of the “Twelfth Annual Report of the Fishery 
Board for Scotland,” rather than establish a separate sub- 
genus for them. The definition of the genus Leptopsyllus 
as amended will therefore be as follows ! :— 
LEPTOPSYLLUS (amended), 7. Scott, “Twelfth Annual 
Report of the Fishery Board for Scotland,” part iii. p. 253 
(1894).—Body elongate, cylindrical, somewhat similar in form 
to Cylindropsyllus, Brady. Anterior antennz (in the female, 
seven or) eight-jointed, short. (In the male the anterior 
antenne are modified and hinged for grasping.) Posterior 
antenne three-jointed ; secondary branch small, one-jointed. 
Mandibles well developed, the broad biting part armed with 
several strong teeth ; palp comparatively large, consisting of 
a single two-jointed branch (or of two branches—the distal 
branch being two-jointed, while the proximal branch, which 
is smaller, is one-jointed). Other mouth appendages as in 
Cletodes, except that the posterior foct-jaws are three-jointed. 
Both branches of the first pair of swimming feet short, two- 
jointed. In the second and third pairs the inner branches 
(are one or two-jointed and more or less rudimentary, or) 
1 The Amendmients are within ( ). 
