— 32 — 



Lœvistriatœ Cl. Syn. II, p. 66. 



20. N. Yarrensis Grun. A. S. Ail. tab. XLVI, fig. 2. tab. nostr. fig. 6. 



Lem Dan (5 samples). 



Only in one of the samples a single specimen of this species agreeing 

 with the figure by A. S. (1. c.) has been met with. Smaller forms agreeing 

 tolerably well with those from V. Heurck's types No. 542 (from Yarra-Yarra, 

 fossil) only with their apices a little more attenuated and thus reminding 

 of the variety v simbirskiana u (Pant. II, tab. XII, fig 16) are much more 

 common in the collection. 



Area: Europe (Kiel), Hungary (fossil). America, Africa, Asia, Australia. 



21. N. bicontracta Öst. sp. nov. tab. nostr. fig. 7. 



L. 0,028 mm., B. in the middle 0,0085 mm., at the constriction 

 0,0055 mm. Striæ 12—13 in 0,oi mm. 



Valve biconstricted, with greatest breadth in the middle and 

 with cuneate apices. Striæ radiate in the middle with a single 

 short stria inserted, towards the apices at right angle to and nearly 

 reaching the apical axis. Central area narrow, apices slightly curved. 



The systematical place of this small species is doubtful. Perhaps it 

 is related to a „fragliche Form" from New Yersey in A. S. Atl. tab. GCXII, 

 fig. 2, which seems to approach to Colonels Egena A. S. (Cl. Syn. I, p. 66). 

 As I think I have seen a slight trace of a transversal lineation of the 

 striæ, I dare not refer it to „Pinnularia" . 



Lem Ngob. Only one specimen met with. 



Pinnularia Ehr. (1843), Cl. Syn. Û, p. 71. 

 Capitatœ Gl. 1. c. p. 75. 



22. P. Itraunii Grun. V.H. Syn. tab. VI, fig. 21. A. S. Atl. tab. XLV, 

 figs. 77 — 78. 



Naval station, Lem Dan, Lem Ngob. (9 samples). 



Rather variable, especially in size. The greatest length observed by 

 me is 0,086 mm. 



Area: Europe, America, Bengal, Australia. 



23. P. interrupta W. Sm. A. S. Atl. tab. XLV, fig. 70. 

 Klong Munsé. 



Area: Europe, America, Asia, Australia. 



24. P. microstauron Ehr. V. H. Syn. tab. VI, fig. 9. A. S. Atl. 

 tab. XLIV, fig. 35. 



Lem Dan, Lem Ngob. 



Area: Spitzbergen, Greenland, Kamtschatka, Europe, N.America, Australia. 



