Simocephalus, Schoedler. 
8. vetulus, "n F.M. A common em recorded from the lake, 
pond in front of Museum No. water-ily pond, tank near 
Jodrell pe aat ea and the enis diteh (south of Isleworth 
| Ferry A aste Ephippial females were observed in May and 
Augus 
8. exspinosus, Koch, ? De Geer. Victoria regia tank, tank in 
Winter Garden, and the riverside ditch (both north and "south of 
Isleworth Ferry Gate). Not such a common species as the fore 
going, but it occurred in considerable numbers in the Victoria 
regia tank in October 
S. serrulatus, Koch. Seen only in the lake.  Ephippial 
females obtained in October. This is decidedly a rare British 
: in : 
e Since taken the species in Anglesey and at Richmond Park. 
he Royal 
Microscopical Society and Quekett Microscopical Club, and m 
noticed in the lists of exhibits. 
Ceriodaphnia, Dana. 
C. reticulata, Jurine. The lake. Only noticed in October. 
C. pulchella, Sars. Pond in front of Museum No. I. August. 
This is the form I have hitherto recorded as C. quadrangula 
(O.F.M.), but ita appears from Lilljeborg's monograph that it is 
really Sars's C. pulchella, while on the other hand the species I 
have recorded as C. pulchella should be C. quadrangula. The 
two foris it sod hardly be said are extremely closely allied. 
Bosmina, Baird. 
B. € O.F.M. Occurs pretty constantly in the pond in 
front of Museum No. I. Also seen from the lake. Usually the 
Specimens were gm typical longirostris, but in the pond m 
p 
3lst May were approaching the cornuta type, and o 
23rd pei all were of this varie mo 
Ilyoeryptus, Sars. 
u 
Quekett Micro. Club, ser. 2, vk 5, pp. 429 y Since then I 
have found it three times in the open, namely, in Rollesby and 
A ee Visage 1898, and in the Basingstoke Canal near 
Weybridge, 1 
Eurycercus, Baird. : 
.. EK. lamellatus O.F.M. The lake and the water-lily pond. 
