[bailey] the DIATOxMS OF NEW BRUNSWICK 69 



DiATOMA. — -The two species, D. tenuis-Ag., and D. hyemale-hyng., are freshwater 



forms, but occur in the brackish waters of the Kennebecasis. D. hyalinum 



occurs at Richibucto. 

 Epithemia. — Seven species have been observed. AU but one, E. hyndmani, occur 



in the brackish waters of the Kennebecasis while the latter, together with E. 



turgida, E. gibba, E. musculus and E. zebra are common on the North Shore. 



E. ventricosa occurs in St. John Harbor. E. zebra, E. turgida and E. gibba 



are found in Summerside Harbor, P.E.I. 

 EuNOTiA. — This is a fresh water genus, but five of the species listed were observed 



in the brackish waters of the Kennebecasis. These are Eu. lunaris, Eu. monodon, 



E. diodon, E. major and E. pedinalis, while E. tetraodon is found in quite salt 

 water at Bathurst, Newcastle and Campbelton. Eu. diadema was observed at 

 Bathurst. The genus is very rare in the waters of P.E. Island. 



Fragillaria. — The species of this genus found in the district under review are 



F. capucina, F. construens, F. wVescens-Ralfs., and F. Harrisonii-Grun., the first 

 at several points around the Bay Chaleur, the second in infusorial deposits, 

 the last two at northern points. A form doubtfully referred to F. pacifica- 

 Grun., was found in the brackish waters of the Kennebecasis. 



GoMPHONEMA. — The four species listed are all freshwater forms, and occur, quite 

 abundantly, in ponds and lakes, but G. acuminatum was also found in the 

 brackish waters of the Kennebecasis and of the Miramichi river at Nelson. 



G. constrictum was found also in brackish waters at Nelson, Bathurst and New- 

 castle. G. geminatum-Ag., occurs in the Kennebecasis and lower St. John, 

 while C. capitatum, with one exception (at Nelson) is confined to fresh water. 

 All four species abound in infusorial earths. 



HiMANTiDiTJM. — Four species occur, all of which are found in fresh water ponds 

 and lakes, as well as in infusorial deposits; but H. arcus and H. majus were also 

 found in brackish water at Richibucto and H. undulatuyn.W.S., in the lower 

 St. John. H. pectinale and H. bidens have also been observed. 



Grammatophora. — Two species, G. marina-Kutz., and G. serpentina-'Ehv., occur 

 on both shores of New Brunswick, the first being the most common of the two. 

 G. striata has been observed at several points in Prince Edward Island, and on 

 the North Shore of New Brunswick, but is comparatively rare. 



HoM^CLADiA. — H. filiformis-W . S., has been observed in the Kennebecasis and at 

 several points in the Bay Chaleur, while H. sigmoidea is especially abundant 

 in the North Shore Harbors of Richibucto, Chatham, Bathurst, &c. H. capitata 

 has been observed only in Passamaquoddy Bay. 



Hyalodiscus. — One only species, H. subtilis, has been observed. It occurs both 

 in Passamaquoddy Bay and in the Kennebecasis and again at Richibucto, 

 Chatham, and other northern stations and on P.E. Island. The forms are 

 generally small. 



Isthmia. — Two species only and these rare. /. nervosa was found in pure sea water 

 in and about Passamaquoddy and Campo Bello; E. enervis-Khr., also at 

 Campo Bello and the lower part of the St. John river. Neither has been seen 

 on the North Shore, but E. nervosa occurs in the waters of Prince Edward 

 Island. 



LiCMOPHORA. — L. Lyngbei-G., has been gathered in brackish water at Matthew's 

 Cove on the Kennebecasis, L. flabellata at Richibucto and L.tincla at Shippegan, 

 on the Bay Chaleur. The genus is not easily distinguished from Podosphenia 

 and Rhijridophora. 



