KONGL. SV. VET. AKADKMIKNS IIANDLNGAI}. HANI) 27. NID 3. 185 



pnnctate. Lower V. with straight inodian line, ending near the margin. Its central pores some- 

 what distant. Axial area narrow; central large, orbicular. Striir- H to 9 in 0,01 mm. slightly 

 radiate, not distinctly punctate. — Bliaphoneis quarn. Grun. Verh. l.S(i2 p. 381 PI. IV f. 24. ('. 

 (jmirn. A. S. N. S. D. p. 93 PI. Ill f. 15 to 16. Atl. OXCII, p. 20 to 24. Navicuht Ovuhnit A. 8. 

 N. S. D. PI. II f. 12. 6'. clarigera O'Meara M. J. (n. s.) VII PI. VII f. 5? 



Marine: Greenland! Spitsbergen! Finmark! North Sea! Mediterranean Sea! Adriatic! Fossil: 

 Karand, Hungary (a small form L. 0,oi."> mm.)! 



11. A. Lilljeborgii Grun. (1881). — Lanceolate, obtuse. L. 0,oi7 to 0,o4g; B. 0,oo8 to 0,01 

 mm. Upper V. strongly silicious, with lanceolate axial area, one third of the breadth of the valve, 

 with coarse scattered granules. CostiB 8 to 9 in 0,oi mm., slightly radiate, not punctate. Lower 

 valve thin, with lanceolate narrow axial area. Strite 12 in 0,01 mm., radiate in the middle, 

 where some are of uneqiial length, parallel at the ends, finely punctate. — Bot. Centralbl. 1881 

 p. (58. Cl. a. M. D. N:o 102, 311. Diatomiste II PI. Ill f. 19, 20. 



Marine: Grip and Bergen, Norway! He de Brehat, the Channel (Grunow). 



12. C. Lagerheiinii Cl. (1893). — Outline elliptical. L. 0,o2to0,o28; B. 0,01 to 0,01.5 mm. 

 Upper V. with lanceolate axial area, having in its middle two longitudinal rows of coarse puncta. 

 Striaj costate, 8 in 0,oi mm., the two median unilaterally united into a horseshoe-like marking. 

 Lower V. delicate with straight median line. Central area uniting with very large lunate lateral 

 areas. Strite fine, 25 in 0,oi mm. — Diatomiste II PI. Ill f. 21, 22. A. S. Atl. CXC, 4fi? 



Fresh water: Ecuador, Sn. Nicolas, reg. trop.! 



Actinoneis Cl. N. G. 



Outline rhomboid to lanceolate. Valves very dissimilar. Upper valve with strong costse 

 and narrow axial area. Lower valve delicate, with finely punctate and strongly radiate strise. 

 No marginal rim. 



This group comprises a niamber of peculiar diatoms, the upper and lower valves being ex- 

 ceedingly dissimilar. The lower valves are finely punctate-striate and the striae are usually alter- 

 nately longer and shorter in the middle, and strongly radiate throughout. Valves of siich a cha- 

 racter are met with only in the group of Nariculce microstigmatic(^ and lieterostichff;, and in a less 

 degree in the Naviculce lineolatfe {Nav. Gastrum for instance). 



2. <|^°^" 



Artificial ley. 



seshoe-shaped ma 

 Lower valv(3 witli lateral areas A. inopinnfa Cl. 



^ ( Tipper valve with an unilateral horseshoe-shaped marking 2 



1 — — without — — — — — 3 



— without — — A. keferomnrpha Gkun. 



Axial area of the upper valve lanceolate A. Lorenziana Grun. 



— — — — narrow linear 4. 



. I Valve apiculate or rostrate 5. 



1 — not — -- 6. 



.{ 



Costae G in 0,0 1 mm A. mammalis Castr. 



j Axial and central area of the lower valve indistinct A. Clevei Grun. 



1 — — — — — — — distinct 8. 



' ' \ — 19 — — A. dispar Cl. 



Valve short, rhomboid A. baldjikii Btw. 



elongated — or lanceolate 7. 



J Axial area suddenly dilated to a fimbriate central area A. danica Flogel. 



' \ — — lanceolate A. bottnica Cl. 



Kongl. ,Sv. Vet. Akail. HHndl. l?iiMil 27. N':o 3. 24 



