288 136 
With great hesitation I refer this species to Nav. crueif. Grun., from 
wich it differs by its form and its closer striation. Perhaps it ought to 
be considered a separate species. 
120. N. digito-radiata Greg. var., cnfr. V.H. Syn. tab. VII, fig. 6. 
L. 0,026 mm., b. 0,01 mm. Striz 11 in 0,01 mm. finely trans- 
versely lineated. 
K Kt (1 sample). 
In outline and habit this form exactly agrees with V. H.’s figure 
quoted above of N. Reinhardti Grun., but as the striz are finely trans- 
versely lineate I think to refer it to N. dig. rad. 
Area: N. digit.: Arctic Sea, Europe, Caspi Sea. N. Reinh.: Europe, Tri- 
nidad. 
121. N. (Alloioneis) mediterranea Brun & Cl. var.? sealigera Perag. 
Perag. Diat. de Fr. tab. XI, fig. 20. 
Solitary in a sample from TK. 
Area: Neapel (Perag.). 
This present form differs from Peragallo’s species in being a little 
more closely striated. 5 strie in 0,01 mm. 
122. N. peregrina Ehb. var. Menisculus Schum. V.H. Syn. tab. VIII, 
figs. 23-24, 
LN (1 sample). 
Area: Europe, Baltic, Argentina. 
123. N. Zostereti Grun. A.S. Atl. tab. XLVI, figs. 42—44, 
KKm, KKt, KMn, TK (14 samples), Samoa. 
Area: Arctic Ocean, Brazil, Adriatic, Madagascar, Bab el Mandeb, Ceylon, 
Labuan, Java, China, Japan, Sandwich Islands, Samoa. 
Didyme. 
124, N. (Diploneis) Bombus Ehb. A.S. N.S. D. tab. I, fig. 1. 
KKt LN (3 samples). 
Area: probably ubiquitous. 
In a sample from KKt I have found it but only 0,024 mm. long. 
125. N. (Dipl.) chersonnensis Grun. Perag. Diat. de Fr. tab. XIX, 
fig. 9. 
KCn, KKt, KMn—CLt, LN (12 samples). 
Area: very videly distributed (Cleve). 
126. N. (Dipl) Crabro Ehb. Perag. Diat. de Fr. tab. XV. fig. 1. 
KCn, KKt (3 samples). 
