310 



TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Off Ardmore — 108 fathoms. 



July 14th. 



August 11th. 



Calanus finmarchicus ... 



Pseudocalanus elongatus 



Metridia lucens 



Temora longicornis 



Acartia clausi 



Oithona similis 



Nauplii 



Nyctiphanes couchii ... 



Diastylis lucifera 



Decapod larvae 



Euphausid larvae 



Philomedes sp 



Sagitta 



Polychaet larvae 



Limacina 



Lamellibranch larvae ... 



Gastropod larvae 



Medusoids 



Tintinnidae 



Oikopleura 



Larval fish 



Peridinium spp 



Ceratium furca 



,, intermedium 



,, macroceros ... 



Coscinodiscus radiatus 



1,000 



12,500 



100 



2,000 



6,800 



2,400 



21,000 



25 



5 



100 



35 



200 

 200 



1,800 



800 



25 



600 



400 



2 



1,200 

 200 

 200 

 200 



2,400 



500 

 7,600 



1,000 



1,200 



6,800 



2 



16 



2,200 

 600 

 600 



200 

 200 



800 



It is very remarkable how consistent this reduction 

 in numbers is. With the single exception of Limacina, 

 which is an oceanic form brought in by the Atlantic water 

 in swarms, all forms present on both occasions show in 

 August only a fraction — frequently one-half or one-third 

 — of the number present in July. 



Somewhat similarly the two hauls from Loch Sunart, 

 from 35 fathoms on July 15th, and from 44 fathoms on 

 July 25th, show a considerable reduction in numbers on 

 the latter date, and especially a disappearance of the 

 phyto-planktonic element which drops from 6,300 to 400 

 individuals in the haul. Some of our other pairs of hauls 

 (Sound of Coll and off Canna) exemplify, but less 



