[bailey] the diatoms OF NEW BRUNSWICK 73 



Thallassiosira. — This very rare genus, represented by Th. N ordenskioldii was 

 found at one station only, namely, in the Bay of Fundy, off La Tete, in Charlotte 

 county. It is a typically planctonic form. 



Triceratium. — This genus is represented by Tr. alternans. — Bail., found in Passa- 

 maquoddy Bay and at St. Martin, on the Bay of Fundy shore; also in brackish 

 water in the Kennebecasis River, about fifteen miles from the sea, also 

 again in the harbors of Charlottetown and Summerside, P.E.I. Another species 

 not certainly determined, but bearing resemblance to Tr. cinnamomeum was 

 found on the shore of the Bay Chaleur, and others resembling Tr. Brightwellii 

 or T. undulatum in the plankton of the Bay of Fundy. 



Tryblionella. — Tr. scutellum-W.Sm.., probably the same species as Nitschia 

 circumsuta-Bail., is found in the brackish Kennebecasis waters, and again at 



Richibucto, Newcastle and Campelton. C. gracilis W.S., has the same 



distribution. 



Zygoceros. — The single species Zyg. Mobilensis-Bai\., is probably identical with 

 Biddulphia Baileye-W.Sm., and occurs in large numbers in the plankton of 

 the Bay of Fundy. 



General Conclusions. 



Some general conclusions of interest may be drawn from a review 

 of the facts stated above. 



1. The remarkable richness of the Diatom, flora found about the 

 New Brunswick coasts. The total number of species is between three and 

 four hundred, representing not less than seventy genera, mostly marine. 

 It is doubtful whether so large a number has been reported from any 

 similar length of coast line along any portion of the Atlantic sea 

 board. As many as seventy species, representing over forty genera, 

 have been obtained from a single locality on the Kennebecasis River. 



2. The remarkable commingling of fresh water and salt water species. 

 This, as has been explained, is largely accounted for by the remarkable 

 tidal phenomena of the Bay of Fundy, which, as in the case of the St. 

 John, cause a stemming of the outward fresh water flow, and the de- 

 termination of estuarine conditions many miles above the outlet of 

 the river. On the other hand, when the tide is low, the powerful 

 outflowing streams undoubtedly carry many fresh water forms out 

 into the sea, where they are distributed by tidal and other currents. 

 As the collections consisted largely of bottom muds, and the specimens 

 were not living when gathered, it cannot be said that the fresh water 

 forms thus found are indifferent to the presence of saline conditions, 

 but, considering the number, it seems hardly possible to suppose that 

 they do not, for some time at least, survive the changed environment 

 to which they are subjected. 



3. The Character of the Plankton.— Vroî. W. A. Herdman, F.R.S., 

 in his report on the Diatoms of the Irish Sea, gives seven genera as 

 especially characterizing the Plankton of those waters, viz., Chœtoceros, 



