MARINE BIOLOGICAL STATION ON PUFFIN ISLAND. 7 
not yet worked out. Mr. Hurst continued his work at 
the station during the greater part of August. 
During the very low tides of September, Mr. Walker 
joined Mr. Hurst and Professor Herdman at the island, 
and a large amount of material was collected on the long 
South Spit and the Beacon Rocks (see chart). On this 
occasion a considerable area not usually uncovered at low 
tides was exposed, and many magnificent Compound 
Ascidians which have not yet been identified were 
obtained, along with fourteen species of Amphipoda, five 
of which are new to our fauna. 
The attempt was made during September, with what 
success is not yet known, to introduce at Puffin Island the 
large Nudibranch Dendronotus arborescens, which is some- 
times so abundant at Hilbre Island. The first batch of 
specimens was collected at low tide on Hilbre by Mr. 
Clubb, and sent down to me at Puffin Island. They were 
unpacked at once, but were all apparently dead or dying, 
having probably been asphyxiated on the journey. How- 
ever, they were immediately placed in pools on the two 
sides of the South Spit at low tide, and possibly some of 
them may have recovered. A second supply of specimens 
from Hilbre was brought down to Puffin on the 22nd 
September, by Mr. Clubb, and, as they were carefully 
looked after during the journey, they arrived in good 
condition, and weve set free, along with some of their 
spawn, close to the landing place (A, on chart) at the 
south end of the island. They have not been seen since, 
and Mr. Rutherford reports that he looked for them at 
low tides recently without success. Still they may very 
possibly have migrated out into deeper water, and will 
appear on the shore again later on when spawning. 
During the summer the committee commenced a system 
of daily observations upon the weather and the tem- 
