Y 
A458 Messrs. T. and ty Scott on some 
branches is considerably shorter than the first joint, being only 
about two thirds the length of it; the end-joint is also 
narrower than the other; both the branches of the first pair 
are short and are of nearly equal length (fig. 4). The inner 
branches of the next three pairs of swimming-feet, which are 
also two-jointed, are very short, being not much longer than 
the first joint of the outer branches; the outer branches, on 
the other hand, are elongate and robust, and consist of three 
nearly equal joints, as shown by the drawing (fig. 4). In 
the fifth pair the inner produced portion of the basal joint is 
subcylindrical, rather longer than broad, and furnished with 
four stout coarsely plumose setee and two smaller hairs, 
arranged thus—the two small hairs are on the outer margin, 
two of the larger plumose set# spring from the apex, and the 
other two are subterminal, one on each side of the apical sete: 
the secondary joint is in form somewhat like that of the 
produced part of the basal joint, but rather broader ; it is 
furnished with a stout, elongate, and coarsely plumose apical 
seta, in addition to which there is interiorly a smaller sub- 
terminal seta, also plumose, and three small plain sete 
exteriorly—that is, on the distal half of the outer margin, as 
shown in the drawing (fig. 6). Caudal stylets short, narrow, 
and having a wide space between them; each stylet is pro- 
vided with a stout, very long, and coarsely plumose apical 
seta articulated near the base; there is also a smaller apical 
seta, the basal part of which forms a stout conical enlarge- 
ment. 
Habitat. Lochan a Chaite, on the south-east shoulder of 
Ben Lawers, Perthshire, altitude 2400 feet above the sea- 
level; specimens not very common. 
Remarks. 'The characters by which the species is distin- 
guished are the structure of the antennules, the armature of 
the posterior foot-jaws, and, especially, the structure of the 
first and fifth pairs of thoracic feet. The short end-joints of 
the inner branches of the first pair form so marked a character, 
that by them alone we had no difficulty in distinguishing 
specimens of this species from among others of the same 
enus by the use of an ordinary hand-lens. 
The name we give to this species is the maiden surname of 
her who, as wife and mother, has, by a lifelong self-denial 
and ever-ready sympathy, enabled us to overcome difficulties 
in the course of our natural history studies that would other- 
wise have been well nigh insurmountable, and whose native 
home in the beautiful valley of Strathtay is but a few miles 
from the famous mountain on whose giant shoulder rests the 
little loch in which the species was found. 
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