[mcmMURRICH] PLANKTON OF BRITISH COLUMBIA COAST 87 
Fig 13 
Fig 14 
Fig. 13. Fifth thoracic limbs of Paralabidocera amphitrites © 
Fig. 14. Urosome of Paralabidocera amphitrites © 
the most abundant species was again Acartia longiremis and with it 
was associated less abundantly Calanus finmarchicus, Paracalanus 
parvus, Centropages hamatus, and Corycaeus affinis. Barnacle larvae 
were also frequent and Schizopod larvae occasional, while a couple of 
examples of an undetermined Brachyuran were also captured. 
5. For comparison with the above records, an account may be 
given of two surface gatherings taken during the same voyage, but 
from water that showed no signs of colouration, in which, that is to 
say, there was no special concentration of the plankton. The first 
of these was a gathering taken off Rose Spit at the northern end of the 
Queen Charlotte Islands, August 25th, 1912. Its most abundant 
constituents were diatoms, a species of Nitzchia being particularly 
frequent, far surpassing any other form in numbers. With it, scattered 
representatives of other genera occurred, those recognized being 
Diatoma elongatum, A sterionella, two species of Coscinodiscus, a Biddul- 
phia (probably B. mobiliensis), a Melosira, Chaetoceras decipiens 
and Riizosolenia alata. Three species of Dinoflagellates were noted, 
all belonging to the genus Ceratium, C. fusus, C. tripos, and C. furca; 
the fusus being the most frequent. Rare examples of the Silicoflagel- 
late Distephanus speculum were seen, and also of the Tintinnode, Cyt- 
tarocylis denticulata C and L. A single example of the Brachiolarian 
