114 Part III. — Tiueidy-Jirst Anmial Report 



Genus Ameira^ Boeck. 



Ameira j)UsiUa, T. Scott, sp. nov. PI. v., figs. 1-10. 



Description of the Female. — Body elongated and slender, resembling 

 generally a small Cantliocamptus or Attheyella ; length about three and a 

 half millimetres (about 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 antennae, 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). 



The inner branches of each of the following three pairs are all shorter 

 than the outer ones, Avhich 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 setse, 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 setce, 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 f ureal joints are fully half as long as the last segments of the 

 abdomen, and the principal tail sette 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 Canthocamytus 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 antennse and mandibles 

 shows its relationship with Ameira, but it diff'ers 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. PI. v., figs. 11-19. 



Description of the Female. — This form, which somewhat resembles 

 Ameira longipes in general appearance, is comparatively small; the 



