NOTES ON DIATOMACE^J. 



93 



Pleurosigma strigilis. 



" intermedium. 



" Spencerii 



Nitzschia scalaris. 



" dubia. 



" sigmoidea. 

 Tryblionella gracilis. 



11 scutell. 



" punctata. 



Epithemia turgida. 



11 musculus. 



u granulata. 



" gibba. 

 Campylodiscus Argus. 

 Surirella biseriata. 



" circumsuta. 



11 splendida. 



" linearis. 



" ovata. 



" limosa. 

 Amphiprora alata. 

 Coscinodiscus minor. 



" cingulatus ? 



" radiatus. 



Coscinodiscus eccentricus. 



Eupodiscus radiatus ? 

 Biddulphia turgida. 

 Cocconema lanceolata. 

 Gomphonema geminatum. 



" acuminatum. 



Striatella unipunctata. 

 Orthosira orichalcea. 

 Melosira Borrerii. 

 Podosira hormoides. 

 Achnanthes. 

 Synedra undulata. 



" radians. 

 Cymbella cuspidata. 

 Mastogloia. 

 Podosphenia. 

 Stauroneis gracilis. 



" salina. 



Triciratium. 

 Amphora ovalis. 

 Eunotia Arcus. 

 Cyclotella Kutxingiana. 

 Himantidium. 



From this one locality therefore may be procured as many as 

 thirty distinct genera, and not less than sixty species. Long be- 

 fore receiving the above gathering, I had considered it probable 

 that an examination of the aquatic flora in the lower portion of 

 the St. John River would yield interesting results, from the very 

 unusual connexion between that stream and the ocean. As 

 will be seen by an examination of the above list, this conjecture 

 has been verified, the gathering containing a curious mixture of 

 fresh-water, marine, and brackish-water species. It will be an in- 

 teresting point to determine how far up this influence ot the salt 

 water, may extend ; marine species being in manv cises found 

 many miles above the faintest suspicion of salt-water. 



If, as is generally supposed, the three great parallel sheets of 

 water, which cross the southern central portion of the Province, 

 viz, the Kennebecasis, Long Reach, and Grand Lake, are really 

 the remains of three or more great central lakes left by the rising 

 of the land above the ocean, and connected with each other and 

 the Bea by the breaking away of the rocky barriers at their south- 

 west extremities, we would expect to find some remains of marine 

 vegetation among the marls and alluvial clays which line their 



