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TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



present. The collection taken on the 13th was similar to 

 the one on the 10th, except that Medusoids were replaced 

 by Pleurobrachia ; Pseudocalanus was absent and the 

 diatom Chcetoceros was present. The gathering taken on 

 the 14th resembled that of the 9th, with the exception 

 that the Copepoda were reduced to two species (Oithona 

 and Acartia) and three kinds of fish eggs in place of one. 

 The constituents of the under-surface collections taken at 

 the same place, on the above mentioned dates, differed in 

 variety from each other, and also from the surface 

 collections, besides differing to some extent in quantity. 



Fig. X. — Crab Zoea and Megalopa (enlarged). 



On the 9th, the collection (5 to 7 fathoms) consisted of 

 1 c.c. of organisms, and contained Chcetoceros, Ceratium 

 tripos, Medusoid gonophores, Sagitta, Tomojrteris, Crab 

 Zoea, Podon, Pseudocalanus, Temora, Isias, Acartia, 

 Oithona, Copepod nauplii, Oikopleura, and Rockling eggs. 

 The organisms present at the surface but absent from the 

 lower water were Autolytus, Crab Megalopa, " Mysis " 

 stage of Crangon, Calanus, and Anomalocera. The collec- 

 tion taken on the 10th (5 to T fathoms) was the same in 

 bulk as the surface one, and differed very little from it; 



