IV.] SIEVERSIA GLACIALIS. 151 



salt as at the bottom of the Kara Sea. Uiider so variable 

 hydrographical conditions we might have expected an ex- 

 ceedingly scanty marine fauna, but this was by no means the 

 case. For the dredgings in the harbour gave Dr. Stuxberg a 

 not inconsiderable yield, consisting of the same types as those 

 which are found in the salt water at the bottom of the Kara Sea. 



SIEVERSIA GLACIAI.IS R. B«. 



From Port Dickson. 



This circumstance appears to show that certain evertebrate 

 types can endure a much greater variation in the temperature 

 and salinity of the water than the algae, and that there is a 

 number of species which, though as a rule they live in the 

 strongly cooled layer of salt water at the bottom of the 

 Kara Sea, can bear without injury a considerable diminution in 

 the salinity of the water and an increase of temperature of 

 about 12". 



