SEA-FISHERIES LABORATORY. 215 



105.— Mid-Channel, September 12th, 1907. 



Net used Shear A Tow-net A Shear B Tow-net B 



Depth in fathoms 10 10 20 20 



Catch in c.cm 185 11 135 2 



Biddulphia mobiliensis — — — 130 



Chaetoceros contortum — — — 1,250 



debile — — — 3,700 



decipiens — 3,000 20 3,500 



„ sociale — — — 750 



teres 7,500 — 23,000 



„ convolutum — — — 1,300 



densum — 2,000 — 1,500 



„ diversum — — — 400 



subtile 13,500 — 5,000 



Coscinodiscus concinnus — 500 — 600 



„ radiatus 4,500 — 4,000 



Ditylium brightwellii — — — 120 



Eucanipia zodiacus — 500 — 130 



Rhizosolenia semispina — 80,000 500 165,000 



shrubsolei — 500 50 625 



alata — — — 3,400 



stolterfothii ... — 500 — 1,500 



„ setigera — 250 — — 



Lauderia borealis — 500 — 1,000 



Leptocylindrus danicus — — — 600 



Asterionella japonica — — — 120 



Ceratiuni fusus — 500 50 250 



tripos 10 5,000 50 3,000 



Peridinium sp — 500 — 120 



Trochisciasp — 100 20 — 



Medusoid gonophores ... 45 1 55 3 



Sagitta bipunctata 200 5 1 35 1 



Larval Polychaeta 25 1,500 — 250 



'Mitraria' — 2,000 — 120 



Crab zoea 2 1 — — 



Mysis stage of Crangon 2 — — 1 



Microniscus calani 70 — 10 — 



Calanus helgolandicus 2,600 110 275 20 



Pseudocalanus elongatus ... 300 33,600 285 6,250 



Temora longicornis 10 — 2 1 



Centropages hamatus 6 5 3 2 



Acartia clausi 350 3,640 450 200 



Oithona similis 60 2,840 65 1,200 



Microcalanus pusillus 10 200 10 2,500 



Paracalanus parvus — 100 20 160 



Copepod nauplii 30 24,000 75 — 



juv 60 12,500 275 — 



Gasteropoda, larval 10 1,000 — 500 



Lamellibranchs, „ — 1,000 — 370 



Oikopleurasp 25 1,000 50 140 



Ascidianeggs 25 1,500 25 600 



