FROM WEST COAST OF SCOTLAND AND THE IRISH SEA." 



31 



in the Irish Sea would be regarded as characteristic of two distinct season? 

 of the year, months apart. 



The difference between the Diatom hauls in the open sea and the fine zoo- 

 planhton hauls in the deep fiords running into the mainland, such as Loch 

 Nevis and Loch Hourn, is not so marked, but is still quite noticeable. 



Hauls taken further north, on the other side of Skye, in the Sound of 

 Raasay, off Longa Island and off the Croulins, from depths of 106, IIG, and 

 133 faths., are all zoo-planktons, although not very large or characteristic 

 in appearance. Some are coarser and some finer, some have more Calanoid 

 Copepoda and Sagitta and Medusae than others, but there does not seem to 

 be the constancy of character obtained in some other West Highland 

 localities. Further south, again, in the Firth of Lome and the Lynn of 

 Morven, off Bernera Island, and between Kerrera and Mull, from depths of 

 80 to 116 faths., the gatherings, of which we have half a dozen for 

 comparison, are composed of a very fine material, chiefly zoo-planktonic, 

 consisting of small Copepoda, many Nauplii and Tintinnidae, some Sagitta 

 and Oihopleura, with a few Ceratiwn, Peridininm, and Diatoms ; and the 

 latter when present are mainly Coscinodiscus concinnus rather than the species 

 of Chcetoceros and 1 lialassiosira which are so abundant to the north of Mull. 



If the hauls from these various localities are marked P or Z, according as 

 they are mainly Phyto-plankton or mainly Zoo-plankton, the list comes out 

 as follows : — 



Date. 



Depth in 

 Faths. 



No. OF 

 Hauls. 



Zoo- 



or 



Phytg-Plankton. 



Eemarks. 







Off Ardmore, Midi. 





July 13, '09 . . 

 „ 18, '10 .. 



94 



65, 74, & 85 



1 P. 

 3' P. 



Locli Hourn, 



1 With some small Copepoda, 

 1 Nauplii, kc. 



July 15, '09 . . 



„ 17, '08 .. 



76&90 



73 & 78 



2 Z. 

 4 Z. 



Loch Nevis, 



■ 



July 14, '09 .. 



„ 17, '08 .. 



75 

 70 



1 Z. 



2 Z. 





July 16, '09] . . 

 „ 18, '08 . . 

 „ 20, '08 .. 



133 



65&70 



106 & 116 



Off' Croidi 



1 



2 

 2 



n and Longa. 



Z. 

 Z. 



z. 









Firth of Lorn. 





July 21, '09 ..; 

 „ 22,'10 ..I 



80 & 110 

 108, 110, & 116 



2 Z 



3 Z. 



1 A few Diatoms and 

 f Peridiniaris present. 



