— 136 — 



With great hesitation I refer this species to Nav. crucif. Grim., 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. Striae 11 in 0,01 mm. finely trans- 

 versely lineated. 



KKt (1 sample). 



In outline and habit this form exactly agrees with V. H.'s figure 

 quoted above of N. Beinhardtii Gr un., but as the striæ are finely trans- 

 versely lineate I think to refer it to N. dig. rad. 



Area: N. digit.: Arctic Sea, Europe, Gaspi Sea. N. Reinh.: Europe, Tri- 

 nidad. 



121. Ji. (Alloioneis) mediterranea Brun & GL var.? scaligera Perag. 

 Perag. Diat. de Fr. tab. XI, fig. 20. 



Solitary in a sample from TK. 

 Area: Neapel (Perag.). 



This present form differs from Per a gallons species in being a little 

 more closely striated. 5 striæ in 0,01 mm. 



122. > T . peregrina Ehb. var. Menisculus Schum. V. H. Syn. tab. VIII, 

 figs. 23-24. 



LN (1 sample). 



Area: Europe, Baltic, Argentina. 



123. M. Zostereti Grim. A. S. Atl. tab. XL VII, 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. 



Didymce. 



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). 



