Diatoms from North-East Greenland. 201 



Diploneis Smithii (Bréb.) Cl.. Cl. Syn., I, 96; W. Sm. Syn., 

 Tab. XVII, fig. 152 a (Nav elliptic); Grun. Fz. Js. L., Tab. I, fig. 41. 



Lo c. Off Cape Amélie (Algæ, 3 sampl.), Danmarks Havn (Algæ, 2 sampl.). 



A ret. Distr. Greenl.. East Arct. S. 



Diploneis splendida (Greg.) Cl., Cl. Syn., I, 87; A. Sch. N. S. D., 

 Tab. I, fig. 3. 



Lo c. Danmarks Havn (Algæ), Koldewey Isl. (Algæ). 



Arct. Distr. Greenl., Kast Arct. S. 



Diploneis subcincta (A. Sch.i Cl., Cl. Syn., I, 86; Grun. Fz. Js. Ld., 

 Tab. I, figs. 38—39. 



Lo c. Off Cape Amélie (Algæ, 4 sampl.), Danmarks Havn (Algæ), Koldewey 

 Isl. (Algæ, 3 sampl.). 



Arct. Distr. E. Greenl.. East Arct. S. 



Diploneis vacillans A. Sch. forma ß, Cl. Syn., I, 95; A. S. All., 



Tab. VIII, fig. 34. 



Lo c. Ofr Cape Amélie (Algæ). 



Not before recorded from Arct. S. Several other records. 



Navieulæ fusifornies Cl., 1894. 



Navicula fusiformis, Grun. var. os/rear/a Gaillon, Cl. Syn., 1, 106; 



V. H. Trt., Tab. XXVII, fig. 769. 



Lo c. Koldewey Isl. (Algæ). 



Not before recorded from Arct. S. Several other records. 



Naylculæ orthostichæ Cl., 1894. 

 Navicula kryokonites Cl. var. subprotracta , Cl. Syn., I, 109; 

 Cl. Vega Exp., Tab. XXXVII, fig. 46. 



Lo c. Marg. of the Pack-ice (3 sampl.). 

 Arct. Distr. E. of Greenl., East Arct. S. 



Navicula rostelloides sp. nova. Tab. nost. XIII fig. 1. cf. Øst. 

 Mar. D. Østg., 426, Tab. VI, fig. 73 (Nav. Rostellum W. Sm.). 



Long. 22,«. Lat. 10/i. Str. minime 22 in 10//. 



Valva lanceolata-elliptica, apicibus brevissime subrostratis. Raphe 

 area hyalina angustissima, distincla autem, cincta. Striis parallelis, 

 apices versus subradiantibus et, qvoad perspicere potui, altera in parte 

 media valvæ deficientibus ibiqve fasciam unilateralem male definitam 

 relinqventibus. 



Loc. Marg. of the Pack-ice. 



Arct. Distr. E. of Greenl. 



I had previously given this species as Nav. Rostellum W. Sm., which 

 Cleve (Syn., II, 4) refers to Nav. Placenta Ehr. If, however. Nav. Rostellum 

 should prove to be identical with Nav. Placenta then the present species 

 cannot be Nav, Rostell., because it has not got the characteristic decussate 

 striation of Nav. Placenta. As I have not been able to see any punctation 

 of the striæ I place it, but with hesitation, under Naviculce orthostichæ and 

 as perhaps most nearly allied to Nav. kryokonites CI. 



