— 134 — 



111. ft. balatonis Pant. Pant. Bac. d. Balatonsees tab. III. fig. 64. 

 Tab. nostr. I, fig. 7. 



L. 0,043 mm., B. 0,004 mm. Striæ 10 in 0,01 mm. 

 Solitary in a sample from LN. 

 Area: Balaton See. 



Differs by the somewhat more linear apical area and by a propor- 

 tionally less breadth from the species figured by Pant. 



112 K. (Pinn.) Farcimen Östr. n. sp. Tab. nostr. I, fig. 10. 



L. 0,039 mm., b. 0,009 mm. Striæ 11 in 0,01 mm. Valve linear 

 with rounded apices. Striæ in the middle slightly radiant toward 

 the apices at a right angle to the apical axis. Apical area narrow 

 in the middle widened into a little circular area. Terminal nodi 

 situated on the apices. Raphe rectilinear. 



KKt, LN (2 samples). 



In spite of its more open striation I think this species must be re- 

 ferred to the section parallelistriatce of Cleve; then it is nearest to 

 P. sublinearis Grun. or Pinn, leptosoma Grun., what the small terminal 

 nodi also seem to suggest. In the sample from KKt occurs a shorter 

 and comparatively broader form. L. 0,027 mm., b. 0,01 mm. 



113. N. (Pinn.) qvadratarea A. S. var. Söderlnndi GL Perag. Diat. 

 de Fr. tab. XI, fig. 10. 



Solitary in a sample from KM — GLt. 



Area: Davis Strait, Banyuls, Balearic Islands, Tahiti. 



114. N. retusa Bréb. var. subretusa V. H. Gnfr. A. S. Atl. tab. XL VI, 

 fig. 75 & Perag. Diat. de Fr. tab. XIII, figs. 7 — 8. 



KKt, LN, s.l. (9 samples). 



In its outline the form found by me agrees well with the figures 

 quoted above; however as I have not been able to see any transversal 

 striation of the ribs, I dared not refer it to Nav. cancellata Donk. With 

 Peragallo's Nav. retusa Bréb. (Perag. I.e. fig. 11) characteristic by its 

 broad apical area it has nothing to do. 



Area: N. cancellata ubiquitous, the var. retusa seems to be a northern 

 form ; subretusa : Belgium. 



115. N. (Caloneis) blanda A. S. A. S. N. S. D. tab. II. fig. 27. Perag. 

 Diat. de Fr. tab. XIV, fig. 3. 



KKm, KKt, s.l. (3 samples). 



Area: North Sea, Black Sea, Manche Ghaussy, Seychelles, Labuan, Billiton, 

 Tahiti. 



116. N. (Calon.) Powelli Lewis. Perag. Diat. de Fr. tab. XIV, fig. 6. 



KKt (2 samples). 



Area: Quincy Mass.. Long Island Sound, Baléares. 



