68 
HIRUDINEA. 
Hirudo medicinalis, Z. 
Glossiphonia sexoculata. Water-lily pond. 
9. PLATYHELMINTHES. 
TURBELLARIA. 
Bipalium Kewense. “Occasionally met with in hot-houses all 
over the world.” Shipley and Macbride, * kae y, 1901, . 579. 
Polycelis nigra. In the laboratory tank. 
10. ROTIFERA. 
By Charles F. Rousselet, F.R.M.S. 
The 120 species enumerated in the following list were phisined 
on Mc pte occasions during the years 1897— 1902 from the orna- 
mental waters of Kew mentioned below, and denoted in the list 
by the figures 1-5. 
1l. 
weeds of various kinds, and inhabited on the "surface by orna- 
mental water-fowl. At times pomi ahs Lasers Floscules, 
were plentiful, also some free such as S4 ynchaeta. 
tremula, S. oblonga and Phone dali vibes At other times 
the water was found remarkably clear and free from rambaia] 
ife. 
2. The pond, between museum No. 1. and the palm house, is 
inhabited by numerous aquatic birds, but totally free from wa ater- 
weeds such as are la: abundant in the la ke. This was often found 
to eontain vast numbers of Asplanchna priodonta, Bi E dac 
pala, Synchaeta pectinata, S. oblonga, Rotifer vulgaris, and m 
other species, The rich bacterial and infusorial “ae and fatina 
which apparently owe their existence to the excrement of the 
water-fowl, provide food material for the Rotifera 
3. The water-lily pond, near the extreme west end of the lake 
is a small shallow piece of water which has yielded rich 
gatherings occasionally. 
The tank near the laboratory, devoted to the meege 2: 
eere ege plants has been found very rich i n spec 
on one occasion, on cu 8th, 1897, I Ae 
10 diffe out species of Rotifers from 
