88 THE ROYAL SOCIETY OF CANADA 
mentioned as occurring in the second and fourth patches of “brown 
water’’ was noted and also a few Cyphonautes and a fair number of 
Oikopleura dioica. 
Of Crustacean forms, there were observed a single individual of 
Podon, whose species was undetermined, and the following Copepoda, 
none of which were in any great numbers; Pseudocalanus elongatus 
Boeck, the form identified with Centropages hamatus, Tortanus dis- 
caudatus Thomps. and Scott, Acartia longiremis and Oithona similis 
‘Claus. Numerous Copepod nauplii and immature forms were also 
present, as well as occasional barnacle larvæ and numerous ova 
that were taken to be of some Schizopodan form. A late Peneid 
metazoea was also seen and two young Brachyurans which were not 
identified. In this gathering the only teleostean ova obtained were 
present; they were few in number and could not be identified. 
6. The second gathering that may be used for comparison 
was taken eight miles off Hudson Bay Passage, Dixon Entrance, 
B. C., August 25th, 1912. In marked contrast to gathering 5, this 
one was almost destitute of diatoms, only rare examples being noticed 
of a form which seemed to be a Rhizosolenia, but which could not 
be definitely identified. Flagellate and Protozoan forms were also 
almost wanting, an occasional Noctiluca being the only one.observed. 
On the other hand, a broad armed Pluteus similar to that mentioned 
as occurring in gathering 2 was quite frequent and a single example 
of an Auricularia was also seen. An occasional Cyphonautes occurred 
and also a few examples of Oikopleura dioica. 
Of Crustacea in addition to a small number of Cirrhipede larvae 
and an occasional Evadne and Podon, mature individuals of the fol- 
lowing species of Copepoda were observed; Pseudocalanus elongatus, 
Centropages hamatus, Paralabidocera amphitrites, Tortanus discaudatus, 
Acartia longiremis, and Oithona similis. The most abundant con- 
stituents of the gathering, however, were ova of two kinds; one variety 
was the same as those ova obtained in gathering 5 and identified as 
belonging to some Schizopodan form, while the second variety, less 
numerously represented, was only about half the size of the other, and 
possessed a greatly corrugated chorion. 
From these observations fragmentary though they be, it 
would seem that the “brown water’’ plankton does not, as a rule, 
differ qualitatively from that distributed in a more diffuse manner in 
the neighboring areas. The brown patches merely represent aggre- 
gations of the ordinary plankton, produced perhaps by the local action 
