226 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



figures for the species are in nearly every ease different, 

 although, as we have pointed out in other examples, they 



are of the same "order." 



84.— Train Bank, August 27th. 



Depth in fathoms Weight 



Catch in com 1 1 74 



Chaetoceros teres 30 50 — 



Coseinodiscus concinnus 40 75 



Coscinodiscus radiatus — — 200 



Ceratium fusus 50 250 — 



tripos 150 600 400 



Trochisciasp 40 100 100 



Sagitta bipunctata 3 1 27 



Crab zoea — — 4 



Mysis stage of Crangon — — 2 



Calanus helgolandicus 5 4 1200 



Pseu doc alarms elongatus 80 70 3,000 



Temora longicornis 10 20 500 



Centropages hamatus 30 10 100 



Anomalocera pattersoni 4 — — 



Acartia clausi 550 500 24,700 



Oithona similis : 15 — — 



Isias clavipes 30 30 — 



Parapontella brevicornis [ — 3 — 



Paracalarms parvus 20 15 — 



Copepod nauplii 9.000 7,000 26,500 



„ juv 2,000 1,500 7,000 



Gasteropods, larval 50 150 200 



Fish eggs — Rockling — 11 



Ascidian eggs 2,500 1,000 2,400 



Comparison of Deep and Surface Hauls. 



We have shown in the previous section that in some 

 cases (April) the surface gatherings contain more 

 Copepoda and larval forms, and in others (August) these 

 larger organisms are more abundant in deeper zones (see 

 Forms 19 and 84). When a comparison is made between 

 the three similar open tow-nets which were worked 

 together for 15 minutes at a time — two, at or close to, the 

 surface (0 fathoms) and the other weighted so that it was 

 lowered to a depth of about ten fathoms, and gradually 

 rose, as the boat went slowly ahead, to a depth of a 



