70 THE ROYAL SOCIETY OF CANADA 



Mastogloia. — M. Smithii-Thw., and M. elliptica-\g., occur in the Kennebecasis 

 but are rare. Several specimens of M. exigun were found in the brackish waters 

 of the Kennebecasis and also at Shippegan. 



Melosira. — This is probably the most generally distributed and most abundant 

 of all Diatoms, representatives in large numbers being found in nearly all 

 gatherings. M . varians occurs in the fresh waters of Chamcookand other lakes, 

 but also at many points on the coasts. M. nummuloides is found at all coastal 

 points and also in the lower St. John and Kennebecasis. M. Borer ii is less 

 common as are the other species listed. 



Meridion. — Two species occur. M. drculare is common in lakes, ponds and brooks 

 and is a fresh water form. M. intermedmm occurs in the Kennebecasis and in 

 the Bay Chaleur. 



Navicula. — Of this prolific genus not less than fifty species have been identified 

 with a fair degree of certainty. N. viridis, more commonly known as Pinnu- 

 laria viridis, is very common in fresh water gatherings as also in infusorial 

 earths, but it is also frequently found in the brackish waters of the lower St. 

 John and even in distinctly salt water along the coast, being probably floated 

 out from adjacent streams. With it are found, but less commonly, Nav. major 

 Kutz. N. ovalis and N. elliptica are widely distributed, both being probably 

 varieties of N. Smithii. N. didyma occurs at many points, but only in salt 

 water. A^. macuk^a-Edwards {=Stauroneis maculota , -Bail) occurs in consider- 

 able abundance in the brackish water of the Kennebecasis and again at several 

 points on the Bay Chaleur. It is interesting as showing a wide distribution, 

 the species having been found first by J. W. Bailey in Florida. N. peregrina 

 occurs both in the Kennebecasis, Passamaquoddy Bay and points on the north 

 shore. N. nodosa occurs at Chatham, and P. per magna-Bail, in the Kenne- 

 becasis, as well as about the Bay Chaleur. P. peregrina-K., though not com- 

 mon, is found at widely separated points, such as Passamaquoddy Bay, Chatham, 

 Newcastle and Campbelton. P. polyonca is noticeable for its rarity, one spe- 

 cimen only, but a very typical one, having been obtained from the fresh waters 

 of Chamcook Lake. Several species, such as N. firma, N. semen, N. radiosa, 

 N. Sillimanorum, N. gramdata, N. produda, N. longa, N. Baileyana, and N. 

 Americana-Ehr., have as yet been found only about the Bay Chaleur. N. 

 viridis, N. Brelrisonii, N. rhyncocephala, N. aryiphtgamphus, N. firma, N. dilatata, 

 N. dadylus and N. mesolepta are found in infusorial earths. N. Lyra has been 

 found at several points on the north shore of New Brunswick and on the coasts of 

 P.E. Island. A'^. humerosa is common in the waters of Souris and Summerside,P.E.I. 



NiTSCHiA. — This genus, like Navicula, is a very prolific one — not less than thirty 

 species having been observed. Of these probably the most generally distri- 

 buted is N. sigmoidea, being found in Passamaquoddy Bay, St. John Harbor 

 and the Kennebecasis as well as nearly all the North Shore stations. A'^. 

 vermicularis is almost equally common, but mainly on the North Shore. N. 

 Tryhlionella is of less frequent occurrence yet found both in the Kennebecasis 

 and at several points on the Bay Chaleur. The same is true of N. scalaris-W.S., 

 and of N. circumsuta-Bsiil, and N. bilobata-W.S., the latter ranging all the way 

 from Passamaquoddy Bay to Campbelton, while also found in the St. John 

 river twelve miles above its mouth, and in infusorial deposits. N. dosterium 

 has been obtained both from Passamaquoddy Bay, St. John Harbor and several 

 north shore points. N. longissima has a similar wide range, but is much more 

 common in the water of the Gulf and about P.E. Island than those of the Bay 

 of Fundy. The other species listed are all of rare occurrence. 



