114 Part III —Twenty-frrst Annual Report 
Genus Ametra, Boeck. 
Ameira pusilla, T. Scott, sp. nov. PI. v., figs. 1-10. 
Description of the Female.—Body elongated and slender, resembling 
generally a small Canthocamptus or Attheyella ; length about three and a 
half millimetres (about 7, of an inch), rostrum short (fig. 1). 
The antennules are only moderately elongated and composed of seven 
joints, the second joint is considerably longer than any of the others, and 
‘the antepenultimate one is apparently the smallest, as shown by the 
drawing (fig. 2). 
The anteunz, which are moderately stout (fig. 3), are furnished with a 
small uniarticulated secondary branch. 
The mandibles are of a narrow cylindrical form and are armed with 
several small teeth or spinules on the obliquely truncate apex ; the palp is 
of moderate size and is composed of a somewhat dilated basal joint bearing 
two small one-jointed branches (fig. 4). 
The second maxillipeds are small, two-jointed, and armed with a small 
but moderately stout terminal claw (fig. 5). 
In the first pair of thoracic feet the inner branches, which are three- 
jointed, are very long, but this is owing to the elongation of the first and 
third joints, the middle joint being a short one, the first joint reaches to 
about the extremity of the three-jointed outer branches, while the third 
joint is fully half the length of the first and twice the length of the second 
joint ; the inner branches are also slender in proportion to the length 
fig. 6). 
Bi inner branches of each of the following three pairs are all shorter 
than the outer ones, which are somewhat elongated, and both branches in 
all the three pairs, and especially of the third and fourth, are moderately 
slender (figs. 7 and 8). 
In the fifth pair the inner produced portion of the basal joint is broadly 
sub-cylindrical, and does not reach to the end of the secondary joint ; it 
appears to be provided with four apical sete, the two inner ones being 
moderately short and spiniform, but the two others are longer. The 
secondary joint is also somewhat cylindrical in form, and rounded at the 
ends, its breadth being nearly equal to half the length; it appears to be 
provided with only three apical sete, arranged as shown in the drawing 
(fig. 9), the middle one being very long and slender and the inner one 
also slender and elongated, but the outer is short. 
The furcal joints are fully half as long as the last segments of the 
abdomen, and the principal tail sets are very long and slender (fig. 10). 
Habitat Off Musselburgh, Firth of Forth, in shallow water, but not 
very common. 
Remarks.—This species has a close general resemblance to some forms 
of Canthocamptus, not only in its general configuration but also in some 
of its appendages; this is especially noticeable in the structure of the first 
thoracic feet, which do not differ much from Canthocamptus staphylinus 
or C. northumbricus ; this pair is also somewhat similar to those of 
Stenhelia ima, but the terminal joints of the inner branches are propor- 
tionally considerably longer. The structure of the antenne and mandibles 
shows its relationship with Amezra, but it differs in the structure of the 
first and fifth pairs of thoracic feet from any species previously described, 
so far as these are known to me. 
Ameira ambigua, T. Scott, sp. nov. Pl. v., figs. 11-19. 
Description of the Female.—This form, which somewhat resembles 
Ameira longipes in general appearance, is comparatively small; the 
