of the Fishery Board for Scofl/md. 



253 



clearly distinguish it from that species ; and, taking the sum of its various 

 characters described and figured here, there is no species known to me 

 that it can be identified with. The hairy integument of the first two 

 joints of the antennules — a character that suggested the specific name — 

 is peculiar. 



Attheyella Macandrewx, T. and A. Scott (PI. IX. figs. 1-12). 



1895. Attheyella Macandrewx, T. and A. Scott, Ann and Mag. 

 Nat. Hist., ser. 6, vol. XV., p. 457, PI. XVI. figs. 1-6. 



Description of the species. — Female, length -58 mm. of an inch). 

 In general appearance somewhat similar to AWieyella pygmxa^ G. O. 

 Sars, but rather smaller and less hirsute. Antennules moderately stout, 

 eight-jointed j the end joint is distinctly more elongate than any of the 

 others, and the first four joints are considerably stouter than the last 

 four; the proportionate lengths of the various joints are nearly as in the 

 formula — t 



Proportional lengths of the joints, 9-9'9'6'6'7'6-ll 

 Numbers of the joints, 1 • 2 • 3 • 4* 5 ' 6 ' 7 ' 8 



The secondary branch of the antenna?, is two-jointed, but the end joint 

 is only about half the length of the other (fig. 4). The second joint of 

 the posterior foot-jaws has the inner margin fringed with short but stout 

 seta arranged in a pectinate manner, the stout seta on the inner distal 

 angle of the first joints plumose only on one side (fig. 8). In the first pair 

 of swimming feet the end joint of the two-jointed inner branch is con- 

 siderably shorter than the first joint, — being only about two-thirds of its 

 length ; the end joint is also narrower than the other ; the entire length 

 of the inner and outer branches is about equal (fig. 9). The inner 

 branches of the next three pairs are two-jointed and very short, — they do 

 not extend much beyond the end of the first joint of the outer branches ; 

 the outer branches, on the other hand, are elongate and robust, and con- 

 sist of three nearly equaljoints, as shown by the drawing (fig. 10). In the 

 fifth pair the inner produced part of the basal joint is subcylindrical, rather 

 longer than broad, and bearing on the rounded distal end six very unequal 

 setae arranged thus : two small setae on the outer margin and four stout 

 setae round the apex, — the third one from the inside being stouter and much 

 more elongate than the others ; the secondary joint is in outline some- 

 what like the produced part of the basal joint but rather broader, it is 

 furnished with a long stout and coarsely plumose apical seta, a small sub- 

 apical seta interiorly also plumose, and with three small plain setae on the 

 distal half of the outer margin, as shown by the drawing (fig. 11). 

 Caudal stylets short, narrow, with a considerable space between them, each 

 provided with a very long, stout, and coarsely plumose seta articulated 

 near the base; there is also a second and much smaller apical seta 

 having a stout basal part (fig. 12). 



Habitat. — Lochan a Chaite, a small loch on the south-east side of Ben 

 Lawers, Perthshire, altitude about 2400 feet above sea-level. Rather 

 rare ; a few specimens only obtained. 



Remarks. — The characters by which this species is distinguished are — 

 the structure of the antennules, the armature of the posterior foot-jaws, 

 and especially by the structure of the first and fifth pairs of feet ; the 

 difference in the structure of the first pair is so marked that neither my 

 son nor I experienced any difficulty in distinguishing the species from 

 among others when mixed up together with them, from the end joint 

 being so distinctly shorter than the first in the two-jointed inner branches 

 of the first swimming feet. 



