THE RIVER BURE AND ITS TRIBUTARIES. 241 
COPEPODA. 
Cyclopina LITTORALIS. 
Centropages hamatus. 
Paracalanus parvus. 
Acartia discaudata. 
Euterpina acutifrons. 
TaCHIDIUS LITTORALIS. 
Peltidium DEPRESSUM. 
Caligus rapax. 
MALACOSTRACA. 
Idotea linearis. 
Gammarus duebeni. 
Gnathia maxillaris. 
Heterotanais gurneyi. 
Neomysis vulgaris. 
Sph^eroma rugicauda. 
Macropsis slabberi. 
Pal.emonetes varians. 
CIRRIPEDIA. 
Larvae of Balanus sp. 
OTHER SPECIES. 
OlKOPLEURA DIOICA. 
Noctiluca MILIARIS. 
Hormiphora. 
POLYCILET LARV.E. 
The salt water must have reached far up the river, for the 
fauna was exactly the same at dead low water. The difference 
was exceedingly striking, since not only was the water useless 
for washing purposes, but it was brilliantly phosphorescent at 
night. Conditions, as regards the fauna, remained the same 
till September 7th, when, though the floating fauna was still 
marine, the capture of a Dragon-fly larva and of some floating 
fresh-water weed showed that fresh-water was pushing its 
way down. Unfortunately I was unable to analyse the water 
during this period, but at xo a.m. on September 7th, the salinity 
r 2 
