68 THE ROYAL SOCIETY OF CANADA 



Cleve., occurs in vast numbers in the waters of Passamaquoddy Bay and the 

 Bay of Fundy, and, though less commonly, in those of the Bay Chaleur and 

 of Charlottetown Harbour, P.E.I. Ch. boréale, Ch. didytnus and Ch. chryo- 

 phyllum also occur, but more sparingly. The forms known formerly as Dicla- 

 dia capreolus have been observed in the Bay of Fundy, but it is now thought 

 probable that these are sporangial forms of Chœtoceros. The genus is one 

 as to the synonymy and relationships of which much uncertainty still exists. 



Climacosphenia. — Only two species have been ob.served, each from one locality 

 only, vizt., Richibucto and Campbelton. 



CoccoNEis. — This is a very abundant genus, found in all marine and estuarine 

 gatherings. The most common species is C. scutellum, which was found in 

 almost every locality examined, but in individuals it is exceeded by C. Flacentida, 

 which in several gatherings about Campo Bello Island was found in groups 

 or clusters of one hundred or more. C. pediculus is much less common. 



CoccoNEMA. — This genus is chiefly represented by C. lanceolatum-Ehr. Like its 

 associate, C. Cistula-'Ehr., it is usually regarded as a fresh water species and 

 is found in Chamcook and other lakes; but it has also been found in the 

 brackish waters of the lower St. John as well as the salt waters of Chatham 

 and Newcastle. 



CoLLETONEMA. — Of the two specics representing this genus, one, vizt., C. subcoherens- 

 Thw., has been found both in the Bay of Fundy and about Chatham and Bath- 

 urst, clustered in considerable numbers. C. eximium has so far been observed 

 only at Shippegan in the Bay Chaleur, and the harbor of Charlottetown, P.E.I. 



CosciNODiscus. — This conspicuous genus has so far afforded about twenty distinct 

 species. Of these the most common are Cos. aster omphalus-Fhv., C. radiatus- 

 Grun., and C. eccentricus-Ehr. In the Plankton collections about the lower 

 part of the Bay of Fundy these are exceedingly abundant and often of very 

 large size, while they are also common on the North Shore and in the harbors 

 of Prince Edward Island. The others named in the classified list are much 

 more rare. C. oculus-iridis-Gr., is probably identical with C. aster omphalus. 

 Though the genus is essentially marine, it is rather common and represented 

 by several species in the freshened waters of Kennebecasis Bay. 



CosciNODiscus CONCINNUS. — Is not uncommon in the water of Charlottetown 

 Harbor, P.E.I. , but owing to the very large size of the valves and their fragile 

 character, chemical treatment almost invariably leaves them in a fragmen- 

 tary condition. The radial divisions and marginal spines or dots are usually 

 evident. 



Cyclotella. — Four species have been observed, mainly in estuarine gatherings, 

 from the northern and southern shores, and especially in the waters of Kenne- 

 becasis Bay. C. compta-Kg., and C. sfn'ato-Thw., are the most common. 



Cymatopleura. — Observed as C. apiculata-W J^., at one locality only, on the 

 Kennebecasis, and also as Cy. scutellum, Cy. elliptica was found at Camp- 

 belton. Cy. tumidn and Cy. litistriata occur on P. E. Island. 



Cymbella. — The most common species is Cy. cuspidata found in the St. John river 

 and at several points on the North Shore. The other four species listed are rare. 



DiTYLUM. — Forms closely resembling those of Ditylum Brightwellii-Bsiil., were found 

 in the Plankton of the Bay of Fundy. 



DiCKiEA. — The single species D. pinna/o -Ralfs., has been found at several points 

 on the North Shore, but not elsewhere. 



Encyonema. — Found as C. cœsjritosum and C. venlricosum in the lower St. John 

 River and at Campbelton, but is rare. / 



