TEE DIATOMS OF CANADA 117 



1. Diatoms (Marixe) from the MAonALEx Islands. — Continued. 



(Trachyneis) forcipata Grev. 

 " Kennedyi Sm. 



" humerosa long, short and intermediate forms. 



" " var, Arahica Grim, var Kamorihensii. 



" longa Ralfs. 



" mollis.. Sm. 



" ramosissima Cleve? 



Nitzschia acuminata Sm. 

 ** duhia Sm, 

 " flumenensis Grun. 

 " lanccolata Sm. 

 " socialis Greg. var. 

 " longissima Ralfs. 



" sigmoidea W. S. 

 Plagiogramma Gregoryanum Grev. 

 Pleurosigma attenuatum vel Hippocampus Sm. 

 '' Balticum, Sm. 



" formosum, W. S. 



" estuarii W. S. 



Bhahdonema adriaticum Ktz. 



" minutum Ktz. 



Rhizosolenia styliformis. Bright. 

 Scoliopleura. 



Stauroneis GregorWRalis. 

 Surirella spiralis? Iviitz. 

 S-ynedra Gallionii. Ehr. 



" pulcKella. Ktz. var. 

 Tahellaria fenestrata. Lyng. 



" flocculosa Ktz. 



Van Heurkia (Navicula) rhovihoides Breb. 

 Triceratium alternans Bail. 



The above collection was made (June, 1917) by Dr. Phillip Cox. on behalf of the 

 Biological Station at St. Andrews, N.B., from the long sandbars which form a dis- 

 tinctive feature in the physiography of the Magdalen islands. As might be expected 

 the diatom-flora of the latter bears a general resemblance to that of other parts of the 

 gulf of St. Lawrence and especially Prince Edward island, but at the same time a 

 number of forms found on the Magdalens have not been found elsewhere in the gulf,, 

 while forms common on the shores of Prince Edward Island and the mainland of New 

 Brunswick have not been observed on the Magdalens. 



2. Diatoms from St. Mary's Bay (Mink Cove), N.S. 



Acnanthes longipes Ag. Cyclotella striata Thw. 



Actinoptychus undulatus Ktz. Cymhella. 



Amphora ovalis Kutz. Eunotia. 



Amphiprora alata Kutz. Epithemia turgida Ehr. 



Cocconema lanceolatum Ehr. Gomphonema. 



Biddulphia aurita Breb. Grammatophora marina K 



Coscinodiscus eccentricus Ehr. Hyalodiscus. 



" minutus Licmophora tincta Griin. 



" concinnus W. S. 



