24 ANNALS OF SCOTTISH NATURAL HISTORY 
CLADOCERA—continued. 
1st Visit, 2nd Visit, 3rd Visit, 
July 6. July 13. Aug. 24. 
Eurycercus lamellatus (Miller). ; C: 
Acroperus harpe, Baird. ; nec 
Lynceus (Alona) guttatus (G. O. Sars) . hee: 
. »  guadrangularis (Miller)  . ne. 
- 2 ayinis, Nuevas’ ~. ; bona n.c. nc: 
‘ Nees Vustics (le SCO) s ©. VE. 
é wie wecaneularis, “Gs, O, Salsa a if 
Pleuroxus trigonellus (Miller). : ee 
x, uncinatus, Baird me 
Peratacantha (Peracantha) truncata, Miiller DG: 
Chydorus sphericus, Miller Bo C. 
With the exception of Certodaphnia guadrangula and Lynceus 
(Alona) rectangularis, the species enumerated have already been 
recorded for Whevleenanice but not from the district under con- 
sideration. Certodaphnia quadrangula appears to be somewhat of a 
local species and not very common ; Lynceus (or Alona) rectangularts 
is sometimes not uncommon in pools near the sea where the water 
is slightly brackish, and has been obtained not only in the vicinity 
of the river Ythan, but also on the Links at Aberdeen. 
I may mention that in the large recently published work on the 
Cladocera of Sweden by Prof. W. Lilljeborg,’ the name A/ona of 
Baird is set aside in favour of Lynceus of Muller. The genus 
Lynceus, instituted by Miiller in 1776, came in course of time to 
include forms that differed so considerably from one another that a 
revision and rearrangement of the species it contained became more 
and more urgent. Dr. Baird took the work in hand, and one has 
only to read his “Natural History of the British Entomostraca” to 
see how thoroughly it was done. He broke up the old genus into © 
a number of genera, but the name which Muller had instituted was 
not given to any of them, yet, curiously enough, he reserved the 
name Lynceidze for the family. In Lilljeborg’ s work Miller’s name 
Lynceus is restored for that group of species to which Baird gave the 
name of A/ona. 
I may also state that Lilljeborg has altered Baird’s name fera- 
cantha to Peratacantha. 
OsTRACODA. 
ist Visit, 2nd Visit, 3rd Visit, 
July 6. July 13. Aug. 24. 
Cypria ophthalmica (Jurine) Pees C ¢. 
Cyclocypris serena (Koch) . : ee c: 
i levis (Miller) . : ; hive: 
1 <¢ Cladocera Suecice,” von Prof. W. Lilljeborg [Nova Acta Regiz Societatis 
Scientiarum Upsalensis, Ser. Tertice, vol. xix. (1901)]. 
