174 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



not taken again, and the second and third hauls had no 

 Calanus. The fourth haul contained eight C alarms. 

 Amongst other things, Noctiluca and Sagitta were 

 tolerably common in the four hauls. 



The cruise was continued to the West side of the 

 Isle of Man. Six miles North from Peel another haul was 

 taken, which showed a complete change in constituents. 

 Three Sagitta and sixteen Calanus were found. Pseudo- 

 calanus, Acartia and Oithona were tolerably common. 

 Four genera of Diatoms, represented in each case by a 

 very few specimens, a few larval Polychaetes, Ceratium 

 tripos and C. fusus, and " Mitraria " but no Noctiluca, 

 were taken. It is probable that the few Diatoms present 

 in the fifth haul had remained attached to the meshes of 

 the net since the previous haul. A collection taken with 

 an ordinary surface tow-net near the same spot did not 

 contain a single Diatom. Otherwise the constituents 

 found by this net were the same as those contained in the 

 Hensen net collection. The quantity of material taken 

 each time the Hensen net was hauled differed in every 

 instance. 



The colour of the material collected in hauls I.-IY. 

 varied from a decided green to a greenish yellow. The 

 first haul, from its characteristic colour was obviously 

 mainly composed of Diatoms. Haul Y. was almost white 

 in colour. 



The following table shows the results of the five hauls 

 witli the Hensen net : — 



