MARINE BIOLOGICAL STATION AT PORT ERIN. 49 



two organisms present at the surface (Mednsoid 

 gonophores and Centropages) were absent and their places 

 were taken by Autolytus and Crab Megalopa. The deep 

 water (10 fathoms), on the 13th, had apparently more 

 abundant life than the surface of the same date. The 

 quantity taken measured 32 c.c, and was rich in Cope- 

 poda. Centropages and Oithona were entirely absent from 

 the deep collection; the latter was very abundant at the 

 surface ; P seudocalanus was tolerably common at 

 10 fathoms but not represented at the surface ; Chcetoceros, 

 Ceratium tripos and C. furca, Pleurobrachia and Autolytus 

 were absent at 10 fathoms, but Crab Zoea, Podon, Evadne, 

 and Rockling eggs were present. The quantity taken by 

 the deep net on the 14th measured 40 c.c, and was again 

 rich in Copepoda, the genera present being Calanus, 

 P seudocalanus , Temora, Centropages, and Acartia. 

 Oithona, although very plentiful at the surface, was not 

 represented in the deep collection. This is rather 

 interesting ; on two consecutive days Oithona appeared to 

 be confined to the surface layer of the sea-water, while 

 collections taken a week later in the same place showed 

 that it was present all through the water, from surface to 

 bottom. Cho3toceros, Ceratium, Megalopa and fish eggs, 

 which were noted at the surface, were absent from the 

 deeper water, their places to some extent being taken by 

 Tomopteris, Crab Zoea, and Evadne. 



Collections taken oif Niarbyl, on August 27th and 

 28th, showed variation in quantity and in constituents. 

 The amount of plankton taken at the surface on the 27th 

 was 11 c.c, and on the 28th 3 c.c. The contents of the 

 deep net (10 to 15 fathoms) on the 27th measured 5, c.c, 

 and at 10 fathoms, on the 28th, 2 c.c. The Hens-en net, 

 towed at 5 to 7 fathoms on the 27th, yielded 8J c.c. Four 

 organisms (Megalopa, P seudocalanus, Anomalocera, and 



