MARINE BIOLOGICAL STATION AT PORT ERIN. DO 
identification, writes that they were in too early a stage to 
enable him to recognise the species. It is curious that in spite 
of careful search the hydroid stocks from which this and other 
previously recorded medusz have arisen have not been found 
in the pond. When the ponds were drained for their annual 
cleanmg in September, various other Invertebrates were 
found: On the vertical wall at one end of the lobster pond a 
colony of the barnacle Balanus balanoides had established 
themselves and attained a considerable size, and a well-grown 
Fic. 2. Colony of T'ubularia larynx in aquarium jar. ‘Two-thirds nat. size. 
y 1 J 
specimen of the Polynoid worm Lepidonotus squamatus was 
found in the larger plaice pond. Great swarms of the Copepod 
Acartia clausi were seen in the smaller plaice pond as the 
water was drained from it. 
The common limpet, Patella vulgata, and the periwinkle, 
Littorina rudis, are now well-established inhabitants of the 
