182. TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 

— —_ = — —— o- _ — 
OCEANIC. NERITIC. 
2 

Acartia clausi (?) Alteutha depressa. 
Anomalocera pattersoni 
Calanus helgolandicus. 
Candacia armata. 
Centropages typicus (?) Centropages hamatus (?) 
Clytemnestra rostrata. 
Corycaeus anglicus. 
Diaixis hibernica. 
Euchaeta norvegica. Isias clavipes. 
Metridia lucens. 
Microcalanus pusillus. 
Oithona similis. 
Oncaea subtilis. O. sp. 
Paracalanus parvus. Parapontella brevicornis. 
Pseudocalanus elcngatus. | Thalestris longimana, T. peltata, 
| T.. serratula. 
Temora longicornis. 
Hvadne nordmanni. 
Podon wntermedium. 

Orkopleura dioica. 

On the lines indicated in this list we have, in the 
previous parts of this paper, made use of the terms 
oceanic and neritic as apphed to gatherings in which one 
or the other type of organism predominated; and if, on 
that basis, we now take into consideration all the evidence 
given in the preceding pages, we find that the West 
Coast of Scotland falls into three well-marked areas, not 
merely geographically, but also in the distribution of its 
summer plankton. 
(1) The Clyde sea-area to the South of and inside 
Cantyre is characterised by zoo-plankton, and the species 
are, in the main, oceanic. 
(2) The area around and to the North of Mull, 
extending from Cantyre to the southern coast of the 
Island of Skye, contains, in July, a well-marked phyto- 
plankton which is mainly neritic in character. 
(3) To the North of Skye, again, a zoo-plankton 
appears which contains some oceanic species, 
