K0N6L. SV. VET. AKADEMIENS HANDLINGAR. BAND 27. N:0 3. 49 



Var. Neupaueri Pant. (1886). — V. elliptical, with obtuse, not rostrate, ends. Strise 11 or 

 12 (middle) to 12 or 13 (ends). — N. Neupaueri Pant. I p. 27 Pl. XIV f. 123. 



Marine: Hungary, fossil! Japan, fossil (Tempére), Madagascar! China (Grove CoU.). 



Var. plagiostoma Grun. (1879). — V. with parallel margins and rostrate ends. L. 0,04 5 to 

 0,075; B. 0,022 to 0,032 mm. Axial area narrow. Central area large, more dilated on one half 

 of the valve than on the other. Strise 10 in 0, 01 ram. slightly radiate, parallel at the ends. 

 Puncta about 12 in 0,oi mm. — Nav. plagiost. Grun. in Cl. M. D. N:o 257. 



Marine: Virgin Islands! Pensacola! North Carolina! 



Forma fossilis Pant. (1889). — L. 0,o5i; B. 0,024 mm. Strise 12,5 in 0,oi mm. — N. irro- 

 rata v. fossilis Pant. II p. 49 Pl. VIII f. 147. 



Marine: Hungary, fossil (Pant.). 



It seems, to judge from the figure, questionable whether the var. fossilis is not an Ano- 

 moeoneis. 



45. N. Epsilon Cl. (1893). — V. laneeolate, with rostrate ends. L. 0,o8 to 0,i; B. 0,04 

 mm. Median line with biiid median pores, and terminal fissures turned in opposite directions. 

 Axial area narrow, slightly dilated around the central nodnle. Strise 10 in 0, 01 mm., radiate 

 throughout. Puncta near the margins 10 in 0, 01 mm., on the depression about 6 in 0, 01 mm. dis- 

 posed in undulating, longitudinal rows. — Diatomiste II p. 12 Pl. I f. 3. 



Marine: China (Thum!) Japan (Brun Coll.)! 



4fi. N. margaritifera Truan a. Witt (1888). — V. elliptical, with acute ends. L. 0,i; 

 B. 0,0 5 mm. Median line with the ends at some distance from the margin of the valve. Struc- 

 ture: large puncta (about 5 in 0,oi mm.) irregularly scattered över the whole valve. — Jeremie 

 D. p. 17 Pl. IV t 10. 



Marine: Hayti, fossil (Truan and Witt). 



This form is very dissimilar to all of this section and its systematic position uncertain. 

 N'. lieusii Pant. III Pl. XXXIII f. 473 (1893) has also scattered puncta, but with a rim of iine 

 strise. It may be an allied species, if not N. glacialis car. septentrionalis. 



Al. N. arabica Grun. (1875). — V. with parallel margins and rostrate ends. L. 0,12; 

 B. 0,04 mm. Terminal fissures large, liookshaped. Central area transversely dilated. Strise 8 in 

 0,01 mm., slightly radiate throughout. Puncta 7 in 0, 01 mm. disposed in undulating, longitudinal 

 rows. — A. S. Atl. VI f. 14. 



Marine: Zanzibar (Atl.). 



The above description is from the fig. in Atl., which shews terminal fissures of a shape, 

 very dissimilar to those of all other species of this section. Specimens by Griinow determined as 

 N. arabica, are identical with N. brasiliensis var. bicuneata. 



48. N. oscitans A. S. (1875). — V. elliptical. L. 0,055 to 0,09; B. 0,03 to 0,0 5 mm. Axial 

 area indistinct; central area irregular, frequently a träns verse linear space narrowed outwards. 

 Strise 9 to 10 in 0, 01 mm., radiate throughout, punctate; puncta about 8 in 0, 01 mm., closer towards 

 the margin than on the depressed parts on both sides of the median line. — Atl. VI f. 41. 



Marine: Balearic Islands! Macassar Straits! Japan, fossil (Brun Coll.)! S:ta Monica, Calif. 

 fossil! Monterey (Atl.). 



The fig. 40 Pl. VI in A. S. Atl. from Davis strait belongs probably to N. oscitans. I have 

 seen similar forms from S:ta Monica (Deby Coll.) and Redondo (Grove), which I cannot separata 

 from N. oscitans. 



Var. subimdulata Cl. and Grove (1891). — V. elliptical, with rounded ends. L. 0,092; 

 B. 0,06 mm. Axial area indistinct, central irregular. Surface of the valve with a slight depression 

 on both sides of the median line. Strise 7 in 0,oi mm., slightly radiate, composed of puncta, more 



KoQgl. Sv. Vet. Akad. Handl. Band 27. N:o 3. 7 



