286 TEAXSACTIOXS LIVEEPOOL BIOLOGICAL SOCIETY. 



We have thus only 22 hauls which are strictly 

 comparable, 2 hauls at Station 14, 7 each at Stations 

 6 and 7, and 6 at Station 5. 



If we consider first the two hauls at Station 14, 

 in the northern part of our district, we shall see that 

 they show a marked difference. 



Station 14. 



31st July, 

 1912. 



7th Nov. 

 1912. 



Calanus finuiarchicus .... 

 Pseudocalanus elongatus 



Acartia clausi 



Oithona similis 



Temora longicornis 



Nauplii 



Sagitta bipunctata 



Tomopteris helgolanclica , 



Polychaet larvae 



Medusoids , 



Pleurobrachia pileus 



Tintinnidae 



Noctiluca miliaris 



Oikopleura dioica 



Peridiniura divergens .... 



Ceratium furca 



„ fusus 



„ intermedium 

 Asterionella japonica ... 



Biddulphia regia* 



„ sinensis 



Chaetoceras debile 



„ decipiens ... 



„ densum 



„ didyrmmi ... 



„ schuttii 



Coseinodiscus concinnus 



„ radiatus 



Dityliuni bright wellii ... 



Guinardia flaccida 



Rhizosolenia semispina 



„ shrubsolei 



„ stolterfothii 



Streptotheca thamensis 

 Thalassiosira gravida ... 



50 



1.400 



950 



550 



250 



3,100 



80 



1 



150 



150 



150 



5,300 



4,700 



450 



600 



8,000 



3,750 



11,400 



224,700 



17 



1,450 



200 



300 



1,350 



2 



100 



1 



1 



1.450 



100 



100 

 100 

 725 

 300 

 950 

 520 

 625 



2,800 

 400 

 500 



4,150 

 100 

 625 

 200 



400 

 1,150 



* This does not imply that this form is to be regarded 

 from B. mobiliensis. 



a distinct species 



The haul on the 31st of July shows a well-marked 

 autumn plankton, consisting mainly of Copepods, 



