new or rare Crustacea from Scotland. 241 
was obtained by carefully washing some masses of Filograna 
trawled in the Moray Firth. 
Pseudanthessius gracilis, Claus. (Pl. XII. figs. 15-20.) 
Pseudanthessius gracilis, Claus, Arbeit. zool. Inst. Wien, 1889, vol. viii. 
p. 344, Taf. iv. figs. 1-7. 
Length 1°3 millim. (75 of an inch). First body-seement 
rather longer than broad, gently curving toward the rounded 
forehead; last thoracic segment scarcely broader than the 
slender abdomen. Anterior antenne not reaching to the end 
of the first body-segment, seven-jointed, the third and last 
joints much shorter, as shown by the appended formula— 
1220.8 14 16 918 29 
iD) Bion US leo mere 
Secondary antennee four-jointed, third joint very small, the 
last provided with one plain and four elongate and geniculate 
spiniform sete. Mandibles stout, produced to an acute apex, 
inner margin evenly convex, middle portion of the exterior 
margin ciliate. Maxille simple, bearing three apical sete 
(fig. 17). Anterior foot-jaws slender, armed with a few strong 
teeth on the upper edge; a plumose seta springs from the 
inner edge near the base of the foot-jaw. Posterior foot-jaw 
three-jointed, second joint somewhat dilated and bearing a 
stout spiniform seta near the middle of the inner aspect ; the 
last joint very small and terminated by a stout conical spine 
and a spiniform seta about three times longer than the joint 
from which it springs (fig. 19). Inner branches of the first 
three pairs of thoracic feet three-jointed ; inner branches of 
the fourth pair one-jointed and scarcely reaching to the end 
of the second joint of the outer branches, and armed at the 
truncate apex with two dagger-shaped spines; the inner 
branches are without sete, but there is a small hook-like 
process near the middle of the inner margin (fig. 20). Fifih 
pair small, subquadrate, attached to the produced angles of 
the last thoracic segment, and provided with an elongate 
dagger-like spine and a plain seta at the apex, and a small 
seta near the articulation of the joint with the thorax. ‘he 
first abdominal segment is about equal to the combined 
length of the next three and is somewhat dilated towards the 
distal end. Caudal stylets equal to about twice the length 
of the last abdominal segment; a small seta springs from 
near the middle of the outer edge of each stylet in addition 
to the terminal sete. 
