518 DICKIE, ARCTIC ALGJE. 



. Nos. 1, 2, and 5, occur at high altitudes in Scotland. 



Schizonema Grevillii, Ag. ? On Desm, aculeata, 



Micromega Stewartii, n. s. Dredged ; N. lat. 73° 20', W. 

 long. 57° 16'. 



Grammonema Jurgensii, Ag. On Desm, aculeata^ 2 fathoms, 

 with myriads of minute Crustacea. 



Melosira arctica, n. s. Mixed with last two, and giving brown 

 tinge to the water in Melville Bay, off the Devil's Thumb, in 

 threads of mucilaginous consistency, infested with Microzoa, July 

 11, 1850. 



Triceratium striolatum, Ehr. 15 fathoms. Union Bay, 

 Sept. 3. 



Fragilaria, n. s. ? Round brown pellicles in the sea. N. 

 lat. 73° 20', W. long. 57° 16'. 



From water in which the Kallymenia above-mentioned (from 

 Assistance Bay) had been macerated ; some freshwater, but the 

 majority marine, forms : 



Amphora hyalina. Kg, *fGrammatophoraanguina5Ehr. 



Cocconeis borealis, Ehr. Navicula quadrifasciata, Ehr. ? 



Coscinodiscus striatus. Kg. * N. didyma, Ehr. 



C. minor, Ehr. * "f Odontella obtusa. Kg. 



C. subtilis, Ehr. O. aurita. Kg. 



C. sp. n. ? * Rhabdonema minutum. Kg. .'* 



* f Cyclotella, sp. n. * f Stauroneis aspera, Kg. 



* t Cymbella helvetica, Kg. f Synedra curvula. Kg. ? 

 Epithemia zebra. Kg. * f S. pulchella, Sm. 



E. Westermanni, Kg. * f Triceratium striolatum, Ehr. 



Gomphonema acuminatum, Ehr. Pleurosigma prolongatum, Sm. 



G. curvatum, Gr.,var. marinum. P. elongatum, Sm. 



Grammatophora stricta, Ehr. P. fasciola, Sm. 



Those marked * were also obtained from the washings of 

 Desmarestia and ChcBtopteris dredged in N. lat. 73° 20', W. 

 lang. 57° 20'. 



Those marked f were also met with in the washings of Agarum 

 Turner i from Union Bay. 



From a slimy substance on the surface of the water and under 

 the ice, N. lat. 72° 15'. 



Grammonema Jurgensii, Ag. Navicula, n. sp. ? 



Pleurosigma Thuringica, Kg. Surirella, n. sp, ? 



P. fasciola, Sm. Triceratium striolatum, Ehr. 



Similar, from N. lat. 73° 17'. 



Achnanthidium delicatulum, Navicula oxyphyllum, Kg. 



Kg. N. Thuringica, Kg. 



Cocconeis rhombus, Ehr. Nitzchia n. sp. ? 



Coscinodiscus marginatus, Ehr. Synedra pulchella, Sm. 

 Melosira arctica, n. sp. 



