286 134 
111. N. balatonis Pant. Pant. Bac. d. Balatonsees tab. Ill. fig. 64. 
Tab. nostr. I, fig. 7. : 
L. 0,043 mm., B. 0,004 mm. Strizee 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 N. (Pinn.) Fareimen Ostr. n.sp. Tab. nostr. I, fig. 10. 
L. 0,039 mm., b. 0,009 mm. Strize 11 in 001mm. Valve linear 
with rounded apices. Strie 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 parallelistriate 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. 0,027mm., b. 0,01 mm. 
113. N. (Pinn.) qvadratarea A.S. var. Séderlundi Cl. Perag. Diat. 
de Fr. tab. XI, fig. 10. 
Solitary in-a sample from KM—CLt. 
Area: Davis Strait, Banyuls, Balearic Islands, Tahiti. 
114. N. retusa Bréb. var. subretusa V.H. Cnfr. A.S. Atl. tab. XLVI, 
fig. 75 & Perag. Dial. de Fr. tab. XIll, figs. 7—8. 
KKt, LN, s. 1. (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. 1. c. 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. Il, fig.27. Perag. 
Diat. de Fr. tab. XIV, fig. 3. 
KKm, KKt, s.1. (3 samples). 
Area: North Sea, Black Sea, Manche Chaussy, 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, Baleares. 
