of the Fishery Board for Scotland. . 241 
_ branches of the next three pairs are somewhat longer than the inner 
_ branches, and both branches are elongate, and moderately stout. In 
_ the fourth pair the first two joints of the outer branches are sub-equal, but 
the last is nearly equal to twice the length of the preceding one ; the joints 
_ of the inner branches are each somewhat longer than the one preceding, 
so that the last is fully twice the length of the first. Both branches have 
the outer margin more or less ciliated, the marginal aud terminal sete are 
nearly all elongate and strongly plumose, and the marginal spines of the 
outer branches are slender (fig. 26). The basal joint of the fifth pair is 
broadly foliacous, the apical portion of which is sub-triangular and 
furnished with six setz round the inner margin and end, the third one 
from the outside being very long. The secondary branch is comparatively 
small, cblong-ovate in form, and extends somewhat beyond the end of 
the basal joint. There are several setae round the outer margin and apex 
(fig. 27). Caudal stylets short, being rather more than half the length 
of the iast adominal segment. ‘The principal terminal seta of each stylet 
is nearly twice the length of the second (fig. 28). 
Habitat.—Off Musselburgh, Firth of Forth. Rather scarce. 
Remarks.—In the structure of the anterior antenne, and of thie first 
and fifth pairs of thoracic feet, this-species differs from any others known 
tome. Neither the anterior antenne nor the first swimming-feet are those 
of the typical Amezra. The end joint of the inner branches of the first 
pair is, in Ameira, usually shorter than the basal joint, but in the 
species now described the reverse is the case; but otherwise there is 
nothing to distinguish it generically from Ameira. 
Ametra longiremis, sp.n. (Pl. V. figs. 29-382; Pl. VI. figs. 1-5.) 
Description. — Female. Body elongate, robust. Length, ‘74 mm. 
(1;th of aninch). Anterior antenne short, stout, eight-jointed. The first 
to the fifth joints gradually decrease in length, the fifth and sixth are 
about equal, while the sixth to the eighth gradually increase in length ; 
the fourth bears a long and moderately stout sensory filament. The 
annexed formula shows the proportional lengths of all the joints :— 
lal SU ES ee SE a: ale 
Posterior antennz comparatively large, two-jointed. Secondary branch 
small, one-jointed, and attached to the middle of the basal joint of the 
primary branch. The mandible-palp consists of a comparatively large 
basal joint, with a much smaller secondary one at its apex. The secondary 
joint bears one marginal and a few apical sete. Posterior foot-jaws 
_ stout, the second joint somewhat gibbous below, and armed with a 
comparatively long terminal claw (fig. 30, pl. V.). The first pair of 
- swimming-feet somewhat similar to those of Ametra refexa, but much 
' stouter and more elongate. In. the fourth pair the inner branches are 
_ proportionally much shorter than in that species, as they scarcely reach to 
the end of the second joint of the outer branches. The first joint is very 
short, while the second and third are each rather longer than the 
_. preceding one. The armature of the fourth pair is different from that of 
the fourth pair in Ameira reflexa (fig. 5, pl. VI.). In the fifth pair the 
basal joint is broadly triangular, and bears two stout spiniform sete on 
the distal half of the inner margin, and two apical sete ; one of them 
small, the other very long, plumose, and spiniform. The secondary branch 
is elongate, narrow, cylindrical, being nearly five times longer than 
broad. Both margins are more or less ciliate. The apex is obliquely 
truncate, and bears several set (fig. 31, pl. V.). Caudal stylets very 
short. 
