242 Part III. — Twelfth Annual Report 



Habitat. — Off St Monance. Scarce. 



Remarks. — This is a robust species, with comparatively elongate 

 swimming-feet. It is readily distinguished by the peculiar form of the 

 fifth pair of thoracic feet. 



Ameira longiremis, var. intermedia, nov. var. (PI. VI. figs. 6-14.) 



This form differs from the species just described, and of which it 

 appears to be a variety, and the more important of these differences are 

 as follows : — The anterior antennae are shorter and less robust, and the 

 proportional lengths of the joints are not the same, as shown by the 

 formula : — 



10 • 14 • 8 • 6 • 5 • 6 • 6 • 6 • 

 1 • 2 ■ 3 ' 4 • 5 • 6 • 7 • 8 • 



The last joint of the inner branches of the first thoracic feet is consider- 

 ably shorter, and the spine that springs from the inner distal angle of the 

 second basal joint is much longer than in the first pair of Ameira longi- 

 remis. The basal joint of the fifth pair is narrower at the proximal end, 

 and more produced ; and the secondary branch is rather broader, and less 

 cylindrical in form. These various differences, though scarcely marked 

 enough to be of specific value, are yet sufficiently important to constitute 

 a varietal difference. 



Ameira exilis, T. and A. Scott. (PI. IX. fig. 30; PL X. figs. 1-12.) 



1894. Ameira exilis, T. and A. Scott, p. 139, pi. viii. figs. 18-20; 

 pi. ix. figs. 1-3. 



Description. — Female. Length, 1 *4 mm. ( T Vth of an inch). Body elon- 

 gate, slender. Anterior antennae slender, nine-jointed. The seventh and 

 eighth joints very small, the others of moderate length, as shown by the 

 formula : — 



13 • 18 • 13 * 10 ' 8 ' 9 ' 3 ' 3 ■ 12 ■ 



1 • 2 ' 3 ' 4 ; 5 • 6 • 7 • 8 • 9 " 



Posterior antennae short, two-jointed. Secondary branch small, one-jointed, 

 and furnished with three terminal plumose setae. Mandibles elongate, 

 narrow. Apex obliquely truncate, armed with a large tooth in the middle 

 and several small ones on each side. The basal joint of the mandible-palp 

 is considerably dilated, with the proximal end forming a narrow stalk-like 

 attachment to the base of the mandible ; while the distal margin bears 

 three short setae. The secondary joint, or branch, of the palp is narrow, 

 and about three times longer than broad, with a small marginal and four 

 apical setae. Posterior foot-jaws robust, and armed with a strong 

 terminal claw (fig. 6). The first pair of swimming-feet are elongate and 

 slender. The first joint of the inner branches, which is furnished with a 

 plumose seta on the lower half of the inner margin, is rather longer than 

 the second and third together. The second joint is little more than half 

 the length of the third, and bears a smalt plumose seta on its inner distal 

 angle. The outer branches, which are composed of three sub-equal joints, 

 extend very little beyond the first joint of the inner branches. The inner 

 branches of the next three pairs are short, and only extend to about the 

 middle of the second joint of the elongate outer branches. The basal 

 joint of the fifth pair is broadly triangular, and furnished with five 

 terminal setae ; the second one of which, counting from the outside, is very 

 long, being more than double the length of the seta on either side of it. 

 The secondary joint is oblong-ovate in shape, its greatest breadth being 

 equal to about two-fifths of the length, and there are five setae of variable 

 lengths ranged at intervals from the middle of the outer margin to the 

 apex, in addition to a very long intero-sub-apical seta. The apex of the 



