[bailey-mackay] diatoms FROM VANCOUVER ISLAND, B. C. 159 



Rhizosolenia styliformis, 



hebetata, 

 Schizonema (Navicula) Grevillei, 

 Skeletonema costata, 

 Surirella fastuosa, 

 S. ovalis, 



Syndendrium diadema, 

 Synedra ulna, 



acus ? 



undulata, 

 Thalassiosira Nordenskioldii, 

 Triceratium. 



In this connexion reference may also be made to two species which, 

 though not first found or named by us, have been found in the Van- 

 couver collections. One is Eunoto gramma hivittatiim Grun. found in 

 plankton at a depth of 20 fathoms; and the other Pleurosigma Olym- 

 pianum found in Pugets Sound. Both are rare species, not represented 

 in many collections. 



List of Diatoms from the Eastern Shores of Vancouver Island, B.C., 



As Determined by L. W. Bailey, LL.D., A. H. MacKay, LL.D., and 

 Oliver Kendall, Jr. 



(The determinations were made from the mounted slides by com- 

 parison with the descriptions and figures of the different authorities 

 quoted. The nomenclature is intended merely to refer the species and 

 varieties to descriptions or figures already published without prejudice 

 to the synonymy which appears to stand in need of revision. When 

 the identification is doubtful a brief description of the more apparent 

 peculiarities of the variation is noted under a provisional name). 



NOTATION OF MEASUREMENTS. 



To indicate the range of variation observed in the individuals of 

 each species two of the extreme measurements are selected from Dr. 

 MacKay 's notes wherever more than one measurement is found. The 

 unit adopted is the Micron, the one thousandth part of the milli- 

 meter, thus avoiding the useless and dangerous load of decimal points, 

 cyphers and the "mm" ticket for each number. 



The length and breadth are indicated uniformly in the same order, 

 the latter being enclosed within parentheses, thus: 61(17) means that 

 the length of the species is 61 microns and the breadth 17. 



