312 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
belong to the true abyssal fauna. The author found it difficult to fix 
any exact limit as to the diurnal migrations of the pelagic species. As 
a result of his collections he was led to doubt the value of Plankton 
determinations, at least so far as Crustacea are concerned. Zacharias in 
his last report has reached the same conclusions, not only in regard to 
the Crustacea, but also to other pelagic organisms. Plankton deter- 
minations, in order to have much value, must, the author thinks, be 
almost infinite in number. 
Phyllopod Crustacea of Japan.* * * § — Mr. C. Ishikawa gives an account 
of the new species Limnadia nipponica. It differs from all the known 
species of Limnadia and Eulimnadia in having four lines of growth on 
the shell. All the specimens examined by the author are, however, 
still young, and it is probable that the number of the lines of growth 
will increase. E. brauerina was first discovered in small ponds formed 
by rain water. These pools were formed after a heavy rain at the end 
of July, and the first trace of the animals was observed a week after- 
wards. These were already quite mature, the females carrying numerous 
eggs laid under the shell. Associated with this species were many 
aquatic beetles, bugs, and mosquito larvee; and the water of the pool 
remained perfectly clear during the month. The continued dry weather 
of August dried up the pools at the end of the month, so that they existed 
only for about four weeks, during which time only one gamogenetic 
generation was found. Of E. pachardiana the female only has been 
observed, although sixty specimens have been under investigation. It 
cannot be doubted that the present colony is a parthenogenetic one, and 
as this species is closely allied to the preceding its different mode of 
reproduction is of great interest. 
Synopsis of British Cladocera. f — Mr. T. Y. Hodgson has prepared 
a synopsis of these Crustacea, which ought to be particularly useful as 
it is now nearly thirty years since one was attempted. The classifi- 
cation of G. 0. Sars has been adopted, and the object of the author has 
been to produce a list giving just sufficient information to lead to the 
identification of a species, and one in accordance with the system of 
nomenclature now in use. 
Ilyocryptus agilis.J — Mr. D. J. Scourfield found this rare mud- 
inhabiting water-flea in the well-known Victoria Regia tank in the 
Botanic Gardens, Regent’s Park. This locality of course is no proof of 
the species being British, but the author has little doubt that it will 
turn out to be so. The female only has as yet been observed. Mr. 
Scourfield adds some few notes on the other described species of 
Ilyocryptus, with the object of indicating the relation of Ilyocryptus 
agilis to its allies. 
Mouth-parts of Cypris-Stage of Balanus.§ — Mr. T. T. Groom has 
carefully examined the Cypris-stage of Balanus perforatus and B. 
balanoides, as well as some stages of an undetermined species of 
* Zool, Mag., vii. (1895) pp. 18-21 (1 pi.), 
t Journ. Birm. Nat. Hist, and Phil. Soc., i. (1895) pp. 101-2. 
t Journ. Quek. Micr. Club, v. (1894) pp. 429-32 (1 pi.). 
§ Quart. Journ. Micr. Soc., xxxvii. (1895) pp. 269-76 (1 pi.). 
