76 THE ROYAL SOCIETY OF CANADA 



Prof. J. W. Bailey, is now Navicula maculata of Edwards, though the 

 hitter had nothing whatever to do with its discovery or description. 

 Perhaps less objection is to be made to the change from Zi/(/oceros 

 Mobilensis, Bailey, to that of Biddulphia Baileyi, for the name of the 

 discoverer is still associated with the species first described by him. 

 The name Doryphora, as used by Smith in his synopsis, is, in the 

 writer's opinion, preferable to that of Raphoneis. 



As regards specific distinctions it is also the opinion of the writer 

 that too much importance is being given to mere variations of di- 

 mensions and to the measurements of striation. In the collections 

 examined by him he finds great diversity and little constancy in either 

 respect. Thus in a single mount may be found varieties of Actin- 

 optychus undulatus of which some are three or four times as large as 

 others. Hyalodiscus subtilis as found in New Brunswick waters, is 

 always much smaller than are the representatives of the same species 

 as foimd further south on the Atlantic coast. Grammatophorae in the 

 same gathering vary greatly in size, as do the Pinularias and Synedras, 

 though representing the same species. Doryphora Bœckii. Sm, 

 according to measurements made by Dr. Mackay, varies from a length 

 of lOG microns to 166 m. ; Stmironeis anceps-Fhr., from 54 to 100 m. 

 N. Smithi-Ag., from 40 to 57 m.; N. maculata-Hâil. , from 96 m. to 

 208 m.; Cocconcis Placentula-l^hv., from 16m to 31m.; Epithemia gibba- 

 K., from 70 to 125 m.; N. Borerii-Grev, from 26 to 50 m. ; and also 

 in many other instances. 



The striation, as regards the number of striae or dots in ten 

 microns, is almost equally variable. 



Probably many species, especially Naviculœ, which have been 

 separated on the above grounds, will have to be discarded. 



The whole subject of the classification and synonymy of the Dia- 

 tomacese is one which requires careful revision. 



New Species. Several forms have been met with which are believed 

 to be new. One of these is a Coscinodisciis, which Dr. Mackaj^ its dis- 

 coverer, has provisionally named as C.Baileyana. He describes it as 106 

 microns in diameter, with a central rosette of six cells 3 nfic long. The 

 surrounding colls aie 6 in 10 microns. The marginal cells 8 in 10 microns. 



Another form thought to be new is a Triceratium. It is triangular 

 in shape, the slightly concave sides having an outer hyaline margin 

 and the interior faintly divided into three equal sections by a cor- 

 responding number of lines meeting in the centre. The apices of the tri- 

 angle are conspicuously I'ugose, and may have been provided with spines. 

 The endochi-ome, as seen in a fresh specimen, was remarkable for its 

 bright green color. The specimen was found at Nash's Creek. It may 

 be a sporangeal form of Tr. spinosum-MAW. No areolation was e^'ident. 



