of the Fishery Board for Scotland. 398 
apical and sub-apical sete. The posterior foot-jaws of the female (fig. 7) 
have moderately short and slender terminal claws, but those of the male 
(fig. 13) are armed with terminal claws of considerable length The first 
three pairs of swimming-feet have both branches three-jointed. The 
inner branches, which are considerably shorter than the outer, are 
provided with a number of sete on the inner margin and apex, but have 
apparently no terminal spines ; the outer branches are also furnished with 
several setee on the inner edge. Moreover, the first and second joints bear 
a short but moderately stout spine on the exterior distal angle, while the 
third joint carries two marginal and two apical spines, the inner one of 
the two apical spines being longer and stouter than the other (figs. 8 
and 9). In the fourth pair (fig. 1V) the inner branches are reduced to a 
single minute joint ; the outer branches are also comparatively small, and 
they want, to a large extent, the spiniform armature of the outer branches 
of the preceding pairs. The fifth pair are small, and each consists of a 
single one-jointed branch, which is furnished with two apical setz 
(fig. 11). 
In the female the lateral processes of the fourth body segment extend 
backward to about the middle of the penultimate segment of the 
abdomen. This abdominal segmeut appears to be larger in the male than 
in the female, as shown by the figure (fig. 14). The caudal segments in 
both male and female are moderately elongated, being about one and a 
half times the length of the anal segment. 
This species when living is one of the more brilliantly coloured of the 
British Copepods, but spirit extracts the colour very quickly. 
Monstrilla (?) dane, Claparéde. (PI. XIIL., figs. 15-20.) 
1863. Monstrilla dane, Clap., Beobacht. itib, Anat, u. Enwickl.- 
witbellos Thiere an der Kiiste v. Normandie angestellt., 
p. 95. 
Representatives of this curious genus of copepods have, as in previous 
years, been occasionally observed in tow-net gatherings of entomostraca 
from the Clyde. Two or three species of the Monstrillide have been 
recorded from North Britain, but the only one that has hitherto been 
observed in the Clyde estuary is the species now referred to, and which I 
have for the present ascribed to Claparéde’s Monstrilla dance. The 
genus Monstrilla was added to the British fauna in 1857 by Sir John 
Lubbock, when he described the Monstrilla anglica. For nearly thirty 
years afterwards little or nothing further appears to have been known 
concerning these organisms, so far at least as regards their distribution 
in the British seas, and in view of this it is somewhat remarkable that 
now not a year passes without a lesser or greater number of specimens 
representing sometimes two or three different species, being observed. 
In 1890 Gilbert C. Bourne published in the Quarterly Journal of 
Microscopical Science 2a uttle paper on the genus Monstrilla, and gave a 
short summary of the characters of the different forms. He divided them 
into two groups, distinguished by the number of furcal hairs. In the one 
group the number of sete on each furcal member is said not to exceed 
three, while in the other there are said to be six sete on each of the 
caudal furca. Monstrilla dance was placed by Mr. Bourne in the first of 
these groups. 
The Clyde specimens which I record here, and which I am inclined to 
ascribe to Monstrilla dane, do not fit in with either of Mr. Bourne’s 
groups as regards the number of furcal hairs. In the more perfect of the 
specimens there are five hairs on each of the caudal rami, four of which 
are prominent and one very small; of the four large hairs, three spring 
