EEPOET ON A COLLECTION OF ANTAECTIC PLANKTON. 297 



Antarctic, as recently advocated by Dr. John Murray, 

 F.B.S. For, as he well puts it :— 



"Every department of natural knowledge would be 

 enriched by systematic observations as to the order in 

 which phenomena coexist and follow each other, in 

 regions of the earth's surface about which we know very 

 little or are wholly ignorant. It is one of the great 

 objects of science to collect observations of the kind here 

 indicated, and it may be safely said that without them we 

 can never arrive at a right understanding of the pheno- 

 mena by which we are surrounded, even in the habitable 

 parts of the globe." 



NOTES on the DIATOMACE.E COLLECTED. 

 By Thomas Comber, F.L.S. 



The following is a list of Diatomacese which I observed 

 in the material from South Shetland Islands, Antarctic, 

 sent by Mr. I. C. Thompson : — 



Thalassiosira antarctica, n. sp., frequent. 

 NitzscJiia seriata, Cleve, rare. 

 Bhizosolenia sima, Cstr., rare. 

 B. setigera, Brtw., frequent. 



B. inermis, Cstr., rare. 



Chcetoceros boreale, Bailey, occasional. 



C. incur viun, rare. 



Corethron criophilum, Cstr., rare. 



C. cometa, Brum, one specimen observed. 



C. unguiculatum, n. sp. 



Hemiaulus balaustium (— Eucamjpia, Cstr.) 



Biddulpliia membranacea, Cleve, new variety. 



Biddidpliia, n. sp. 



Fragilaria linearis, Cstr., rare. 



Asterionella glacialis, Cstr. 



