1897-98. | The Upper Elf Loch, Braids. Bue 
as “frequent,” while Simocephalus is described as “few.” 
When, however, the records of the gathering collected on the 
26th of June 1897 are examined, it is found that Daphnia 
is now in the minority, and is described as “rare,’ while 
Simocephalus is “frequent.” On the other hand, both species, 
in the gathering collected in February last (1898), are de- 
scribed as “rare.” In addition to this apparently alternating 
increase and decrease in the numbers of certain species—an 
alternation which is probably due to seasonal variation— 
another interesting feature in the distribution of the Entomo- 
straca has been observed, which it may be worth while to 
notice here. It was stated in our preliminary report, pub- 
lished last year, that a somewhat rare copepod known as 
Moraria Anderson-Smithi had been obtained in the Upper 
Elf Loch. The first time this copepod was observed here 
was on October 17, 1896: it was again noticed in the 
gatherings collected on March 6, May 1, and June 26, 1897, 
but though it has been carefully searched for in subsequent 
gatherings, no trace of it, alive or dead, has been found. We 
cannot ascribe the disappearance of the copepod in these 
subsequent gatherings to any difference in the mode of collect- 
ing them, for the same method has been as far as possible 
adhered to throughout the whole series of visits we have 
made to the loch; and, on the other hand, we would hardly 
venture to assert that because we had not found this species 
in these gatherings it had therefore become extinct; but we 
think it is quite safe to say that, if it still exists in the loch, 
it must have become exceedinely rare. Moreover, if the 
appended tabular list of the Entomostraca obtained in the 
Upper Elf Loch be examined, it will be further observed that, 
shortly after the disappearance of Moraria Anderson-Smitha, 
another comparatively rare copepod—Canthocamptus mnornatus 
—was obtained for the first time. This species, which occurred 
in the gathering collected on September 11, 1897, had only 
a few months previously been described by one of us as new 
to science, from specimens found in a loch in Forfarshire, and 
also in Linlithgow Loch. How this species happened to be 
introduced into the Upper Elf Loch, or, if usually present 
there, how it came to be so long overlooked, are questions 
more easily asked than answered. Canthocamptus wnornatus 
