THE AROTIC EXPEDITION OF SIR GEORGE NARES. 315 
Point, Bessel's Bay. Length 0'03 millim.; breadth 0:005 millim. 
Striz 18 in 0°01 millim. 
Rhotkosphenia curvata 
(Kütz.)  Bessel's Bay. 
Achnanthes subsessilis, 
Ehrenb., var. (Achnan- 
thidium arcticum, | Cl.). 
Mushroom Point. 
A. coarctata, Bréb. Mush- 
room Point. 
A, delicatula, Kitz. Bes- 
sel’s Bay. 
A. grenlandica,Cl. Bessel’s 
Bay. Very common. 
Cocconeis costata, Greg. 
Bessel’s Bay ; Mushroom 
Point. 
C. jinmarchica, Grun. 
Bessel’s Bay. 
C. scutellum, Ehrenb., and 
var. sfauroneiformis, W. 
Sm. Bessel’s Bay and 
Mushroom Point. 
C. distans, Greg. Mush- 
room Point. 
C. decipiens, Cl. Bessel’s 
Bay. 
C. arctica. Bessel’s Bay. 
Stauroneis aspera,var. inter- 
media, Grun.  Bessel’s 
Bay ; Mushroom Point. 
S. spicula, Dickie. Disco- 
very Bay. 
Schizonema Grevillei, Ag. 
Bessel’s Bay. 
Navicula septentrionalis, Cl. 
(A. Sehm. Atl. pl. vi. fig. 
37). Mushroom Point. 
Navicula digitoradiata, 
Greg. Mushroom Point. 
N. Smithii, Bréb. Mush- 
room Point. 
N. Lyra, var. elliptica. 
Mushroom Point. 
N. directa, W.Sm. Maush- 
room Point. 
JN. bomboides, var. media, 
Grun. Mushroom Point. 
N. latefasciata, Grun. 
Mushroom Point. 
N. subdivisa, Grun, Mush- 
room Point. 
N. peregrina, Kütz. Mush- 
room Point. 
N.interrupta, Kütz. Mush- 
room Point. 
N. Pinnularia, Cl. Mush- 
room Point. 
N. littoralis, Donk. Mush- 
room Point. 
N. subinflata, Qrun. Bes- 
sel's Bay. 
Amphiprora paludosa, Sm., 
var. Discovery Bay. 
A, duplex, Donk. Disco- 
very Bay. 
Synedra kamtschatica, 
Grun.  Bessels Bay 
Mushroom Point. 
, var. minor, 
Grun. Bessel’s Bay. 
S. nitzschioides, Grun. Mushroom Point; Bessel’s Bay. 
Length 0:06 millim.; breadth 0°003 millim. Striw 11 in 0'01 
millim, 
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