236 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



1. Off Ardmore, N. of Mull. Ju ^ } 8 ^ 1910 - J *Jy V^' 191L 



86 fathoms. 105 fathoms. 



Chaetoceras curvisetum 18,571,450 — 



debile 6,571,450 — 



„ decipiens 2,071,440 — 



spp 20,357,150 1,260 



Coscinodiscus radiatus 2,500 420 



Ditylium brightwellii 625 — 



Guinardia flaccida. 71,425 — 



Lauderia borealis 357,145 — 



Nitzschia seriata 1,642,850 — 



Pleurosigma sp 1,250 — 



Rhizosolenia semispina 464,285 — 



„ setigera 17,860 — 



shrubsolii 190,475 — 



stolterfothii 2,142,860 — 



Skeletonema costatum 857,145 — 



Thalassiosira gravida 1,428,575 — 



„ nordenskioldii 571,430 — 



Peridinium spp 10,000 1,260 



Ceratium furca 625 — 



tripos 625 840 



Tintinnidae 13,440 840 



Medusae 13 6 



Sagitta 25 30 



Tomopteris — 1 



Polychaet larvae 625 — 



Plutei 3,600 — 



Gastropod larvae 7,500 — 



LamelUbranch larvae 5,000 — 



Limacina retro versa — 9,360 



Schizopoda t 6 x 



Evadne nordmanni — 525 



Calanus helgolandicus 95 430 



Pseudocalarms elongatus 5,100 2,100 



Temora longicornis 935 3,150 



Oithona similis 625 1,150 



Copepoda juv 1,875 — 



Nauplii 25,625 8,800 



Oikopleura 3,230 420 



This year's haul (right hand column) shows a some- 

 what scanty zooplankton, last year's a very abundant 



phytoplankton. These two hauls show clearly that the 



main difference is not the presence of additional animals 



in the zooplankton, but merely the absence of the 

 Diatoms. 



