of the Fishery Board for Scotland. 76 



the bottom. The surface and mid-water gatherings measured respectively 

 55 and 6 c.c.'s, and consisted chiefly of Calanus, but Pseudoccdanus 

 elongatus was moderately frequent in the surface gathering, and Euchosta 

 norvegica in that from mid-water ; the bottom horizontal haul contained a 

 quantity of mud and was not measured The five vertical hauls collected 

 in March were from 15, 30, 45, and 60 fathoms, and one from near the 

 bottom (about 70 fathoms). All these gatherings were small, and con- 

 tained only a few Calanus, Pseudocalanus, Euchosta, and one or two other 

 common forms. 



April. — Eight gatherings, comprising three horizontal and five vertical 

 hauls, were collected in April. The horizontal hauls consisted of a surface, 

 a mid-water (35 fathoms), and a bottom (70 fathoms) gathering. The 

 surface gathering measured only about lc.c. ; the other two were moder- 

 ately large, and measured 26*5 and 49 c.c.'s respectively. The five 

 vertical hauls were from 15, 30, 44, and 60 fathoms, and one from near 

 the bottom, and measured 2*5, 5*5, 25, 2, and 2 c.c.'s respectively. 

 Calanus was the most common species in these gatherings, but Pseudo- 

 calanus and Centropages hamatus were moderately frequent, and there 

 were also a few others. The following numbers represent approximately 

 the proportional numbers of the species observed in the gathering from 30 

 fathoms: — Calanus 500, Centropages hamatus 150, Pseudocalanus 100, 

 Euchazta 2, Acartia clausi 5, together with a few Evadne nordmanni, Podon 

 leuckarti, larval Balani, Ascidians, and fish eggs. 



May. — Eight gatherings, comprising three horizontal and five vertical 

 hauls, were collected in May. The horizontal hauls consisted of a surface, 

 a mid- water, and a bottom gathering, as in April. The surface catch was 

 a small one, and measured only 2 '5 c.c.'s, in which Calanus and Centro- 

 pages were about equally common, and constituted the chief part of the 

 haul, but Acartia clausi, Evadne, and Podon leuckarti were also frequent ; 

 other forms observed included a few Sagitta, Oikopleura., and fish eggs. 

 The mid-water and bottom hauls measured about 2*5 and 4*5 c.c.'s 

 respectively ; their contents did not differ much from the surface haul just 

 described, except that it contained a few Euchodia and Parapontella brevi- 

 coimis. The vertical hauls were from depths similar to those described 

 under April, and measured 3'5, 3, 3, 5, and 7*5 c.c.'s respectively. 

 The species observed in these gatherings did not differ greatly either 

 in proportion or kinds from those mentioned above, except that 

 Temora longicornis and Anomalocera patersoni occurred in the haul from 

 15 fathoms, and Metridia lucens in that from the deep water. 



June. — Five gatherings, all vertical hauls, were collected in June. 

 They were taken at depths similar to those already described, and 

 measured 3, 11*5, 20*5, 25*5, and 55 c.c.'s respectively. The two last hauls 

 consisted almost entirely of Calanus. The same organism constituted the 

 largest portion of the other gatherings, but Centropages hamatus, Pseudo- 

 calanus elongatus, and Acartia clausi were also present in small numbers. 



August. — Five vertical hauls collected in August measured respectively 

 about 1*5, 2*5, 6, 50, and 14 c.c.'s. These measurements indicate a con- 

 siderable decrease in the number of Crustacea when compared with the 

 June collection. These gatherings consisted almost entirely of Calanus. 



September. — All the gatherings collected in September were vertical 

 hauls. Those from 15, 30, and 45 fathoms were small, and measured only 

 1, 1, and 2*5 c.c.'s respectively. The haul from 60 fathoms measured 9'5 

 and that from 75 fathoms 25 c.c.'s. Each of these hauls shows apparently 

 a still further falling off in the number of pelagic Crustacea at this station. 

 Calanus formed about half of the catch from 15 fathoms, the other half 

 consisting for the most part of Pseudocalanus and Acartia clausi in about 

 equal numbers. Calanus formed about 65 per cent, of the catches from 

 30 and 45 fathoms, and 75 per cent, of the two from deep water. 



