[bailey] the diatoms OF NEW BRUNSWICK 67 



NOTES ON THE MORE IMPORTANT GENERA. 

 (arranged alphabetically) . 



AcNANTHES. — Of the three species observed A. longipes is much the most abundant, 

 and is found at most stations both along the Bay of Fundy coast and that of 

 the North Shore — also in Prince Edward Island. 



AcTiNOPTYCHUS. — No diatom is more commonly met with than this, alike in each 

 of the several districts compared. It exhibits also great diversity of dimensions, 

 varying, as seen with a Jth inch objective, from an apparent size of a five cent 

 piece up to that of a quarter of a dollar. The other two species — {A. subtilis 

 and A. planus) are very rare. 



AcTiNOCYCLUS. — This genus, as represented by A. crossus, has been found at two 

 localities in New Brunswick and two in Prince Edward Island, but is rare in both. 



Amphipleura. — Two species occur, vizt.. Am. pellucida Kutz and Am. sigmoidea — 

 W.S., both in the Kennebecasis and the latter at St. Martin and Chatham. 



Amphiprora. — This genus is represented by six species, as listed, but of these one 

 only {A. alata, Kutz), is at all common. Owing to the delicacy and transparency 

 of the frustule they are readily overlooked. A. ornata Bail and A. lepidoptera 

 Bail are rare forms. A. paludosa is from P.E. Island. 



Amphora. — This genus is represented by six species of which A. ovalis, Kutz, is 

 the only one of common occurrence. It is also more common about the Bay 

 Chaleur than elsewhere. A. rimosa has been found at Souris, P.E.I. 



Asterionella. — A freshwater species {A. /ormosa-Hass) occurs in the waters of 

 Chamcook Lake, and a marine form (believed to be As. Berkeleyi) was found 

 in large numbers in certain plankton gatherings from the Bay of Fundy. 



Attliscus. — Represented, and that only rarely, by Au. sculptus-Ra\î , found in the 

 • Bay Chaleur, and Au. spinosusi at Shippegan. Au. cœlatus occurs in P. E. 

 Island. 



Bacillaria. — This is a typically estuarine genus, and clusters of B. paradoxa Gmel. 

 illustrating its peculiar movements, were observed in the lower parts of the 

 St. John river as well as on the North Shore at Bathurst, Dalhousie, and other 

 points. It has not been noticed on Prince Edward Island. 



Biddulphia. — Of the four species of this genus, as listed, B. aurita-Breb., is much 

 the most common, being found, and sometimes in large numbers, in nearly every 

 gathering whether from the Bay of Fundy or from Prince Edward Island — B. 

 Mobilensis or B. Baileyi, while not usually found in httoral gatherings, is often 

 met with in those of deeper and clearer waters. It is a typically planktonic 

 species and sometimes occurs almost to the exclusion of everything else. 

 B. rhombus-Ehr., is much more rare. B. pulchella has been observed at 

 Souris P.E.I. , and B. lacvis at Newcastle, N.B., and Souris, P.E.I. 



Caloneis ScHUMiNiANA-Lewis. Very rare. As yet on North Shore only. 



Campylodiscus. — This interesting genus is represented in this region by at least 

 six species. C. cribrosus, W. Sm, is the most common, especially on the north 

 Shore. 



It has not been observed in the Bay of Fundy, but occurs in the brackish waters 

 of the lower St. John, and also P.E. Island. The other species listed are also 

 from the North Shore — but are rare. Some undetermined forms of the genus 

 have also been met with. The rare species Campylodiscus Thuretii was found 

 at Souris, P.E.I. 



Chcetoceros. — This is the most characteristic and by far the most abundant of 

 the typically planktonic genera. Its most common species, Ch. decipiens- 



