240 Part III. — Twelfth Annual Report 



two at the apex. The secondary branch is comparatively small and broadly 

 sub-ovate, with a somewhat bifid apex, and bears one seta on the inner 

 margin, one on the outer margin, and one on each lobe of the bifid apex. 

 Caudal stylets very short. 



Habitat. — Vicinity of the Bass Eock. Eather scarce. 



Remarks. — This is a small species, and resembles Stenhelia ima in 

 several of its characters ; but the short anterior antennas, and the large 

 basal joint, and comparatively small and broadly ovate secondary joint 

 of the fifth pair of thoracic feet, readily distinguish it from that species. 



Stenhelia denticulata, I. C. Thompson. 



1893. Stenhelia denticulata, I. C. Thompson (33), p. 20, pi. xxx. 

 figs. 1-11. 



1894. Stenhelia denticulata, T. and A. Scott (31), p. 146. 



Habitat. — Off St Mo nans, and in the vicinity of Inchkeith Island. 



Mr I. C. Thompson obtained the two specimens, from which he de- 

 scribed the species inside the breakwater, at Port Erin, Isle of Man. 

 Several specimens have been captured in the Firth of Forth. This is a 

 comparatively large and well-marked species. The anterior antennae are 

 moderately long and slender, and eight-jointed. The second joint from 

 the base is armed with a strong forward-projecting tooth. 



Genus Ameira, Boeck (1864). 



Ameira rejlexa, sp. n. (PL V. figs. 20-28.) 



Description. — Female. Body moderately robust. Length, '68 mm. 

 (^-th of an inch). Anterior antennas short, stout, and eight-jointed. The 

 first two joints are large, the others are small, the penultimate being shorter 

 than any of the others. The upper distal portion of the fourth joint is 

 produced forwards so as to form the base of a long filiment. The pro- 

 portional lengths of all the joints are nearly as in the formula : — 



16 • 14 • 6 • 5 • 4 • 5 • 3 ; 6 ; 

 1 • 2 • 3 .* 4 • 5 ' 6 ' 7 • 8 • 



Posterior antennae short, two-jointed. A small secondary branch springs 

 from near the middle of the first joint, and is furnished with three 

 terminal setae (fig. 22). Mandibles small. Mandible-palp one-branched. 

 The basal joint is small, and bears a single short terminal seta. The 

 small one-jointed branch springs from the upper part of the external margin 

 of the basal joint, and bears one marginal and three apical setae (fig. 23). 

 Posterior foot-jaws short, moderately stout, consisting of two sub- 

 equal joints, the lower rounded margin of the second joint ciliated. 

 Terminal claw nearly straight, and rather longer than the joint from 

 which it springs (fig. 24). Both branches of the first four pairs of 

 swimming-feet three-jointed ; the outer branches of the first pair reach 

 slightly beyond the end of the second joint of the inner branches. The 

 first joint of the inner branches is stout, and somewhat longer than the 

 second joint, and bears a moderately long plumose seta near the middle 

 of the inner margin. The second joint — which is rather smaller than the 

 first — is furnished w T ith a similar seta near the distal end ; while the 

 last joint, which is slender, and fully one and a half times the length of 

 the second, is provided with one moderately short and two long setee at 

 the apex, and three small spiniform setse on the inner margin, The first 

 and second joints in both branches a r Q strongly ciliated on the outer 

 margin. The first two joints of the ouver branches are each armed with 

 •a moderately long marginal spine, and the last joint with two shorter 

 marginal spines, and three plain terminal setae (fig. 25). The outer 



