of the Fishery Board for Scotland. 115 
specimen represented by the drawing (fig. 11) measures only ‘56 mm. 
(about 2; of an inch). In this form the rostrum is small and the furcal 
joints short, 
The antennules (fig. 12) are elongated and slender and composed of 
eight joints, the smallest joints counting from the proximal end are the 
fifth and seventh, while the second is the largest. The proportional 
lengths of the various joints are shown approximately by the annexed 
formula :— 
Lengths of the joints, - ToS 12 Ee Ree San 2S 
Numbers of the joints, - eae 2 9 a Se 4s Re Ge eS 
The antenne appear to be two-jointed and moderately stout, but the 
secondary branch is small and composed of a single joint (fig. 13). 
The mandibles are very small and of a cylindrical form, the distal end 
is obliquely truncated and armed with minute spines; the palp is also 
very small, and has the basal part slightly dilated and provided with a 
minute one-jointed branch (fig. 14). 
The second maxillipeds are moderately stout and two-jointed, and 
armed with an elongated and slender terminal claw (fig. 15). 
The first pair of thoracic feet have the inner branches elongated and 
moderately stout ; the first joint is about three times as long as the entire 
length of the second and third joints, but these two joints are small and 
sub-equal, The outer branches are moderately slender, and they are 
shorter than the first joint of the inner ones (fig. 16). 
The next three pairs are all elongated and moderately stout. In the 
second pair (fig. 17) the inner branches, which are somewhat shorter than 
the outer, taper towards the distal end, as shown in the drawing, the first 
joint being more dilated than the second, and the second than the last ; 
each of the three joints is furnished with a slender seta on its inner 
margin. The outer branches are slender, and the exterior marginal 
spines are elongated ; the second joint is also provided with one, and the 
third with two slender setze on the inner edge. 
In the fourth pair the inner branches are also, as in the second pair, 
shorter than the second branches, but they are scarcely so stout as those 
of that pair ; moreover, the first and second joints are each furnished with 
a seta on the inner margin, while the third bears two sete. The outer 
branches do not differ much from the same branches in the second pair 
fig. 18). 
In the fifth pair the inner produced portion of the basal joint bears four 
slender setee on its broadly rounded apex, the second one from the inside 
being much longer than the others. The secondary joints are sub- 
cylindrical in general form, but with the ends rounded ; they are each 
about twice as long as broad and carry five sete round the outer margin 
and apex, but the two innermost are considerably longer than the others 
fig. 19). 
ere ane Musselburgh, Firth of Forth ; apparently rare. 
Remarks.—This is one of those troublesome forms which, while 
differing in one or other of its structural details from any of the described 
species I am acquainted with, yet exhibits no single character prominently 
distinctive, such as we have in Amezra longicaudata, T. Scott. The 
following three characters, however, taken in combination will, I think, 
enable this species to be distinguished—(1) the structure of the somewhat 
slender antennules, (2) the comparatively long first joint of the inner 
branches of the first thoracic legs, along with the short second and third 
joints, and (3) the form and armature of the fifth pair in the female. The 
male has not been observed, 
