KONGL. SV. VET. AKADEMIENS HANDLNGAH. BAND 27. N:0 3. 185 



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

 wliat distant. Axial area narrow; central large, orbicular. Strite 8 to 9 in 0,oi mm. slightly 

 radiate, not distinctly piinctate. — Rhaphoneis quarn. Grun. Verli. 1862 p. 381 Pl. IV f. 24. C. 

 quarn. A. S. N. S. D. p. 93 Pl. Ill f. 1.5 to 16. Atl. CXCII, p. 20 to 24. Navicida Ovulnm A. S. 

 N. S. D. Pl. II f. 12. C. davigera 0'Meara M. J. (n. s.) VII Pl. VII f. 5? 



Mai-ine: Greenland! Spitsbergen! Finmark I North Sea! Mediterranean Sea! Adriatic! Fossil: 

 Karand, Hungary (a small form L. 0,oi5 mm.)! 



11. Å. Lilljeborgii Grun. (1881). — Lanceolate, obtuse. L. 0,oi7 to 0,o46; B. 0,oo8 to 0,oi 

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

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

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

 where some are of iinequal length, pai'allel at the ends, iinely punctate. — Bot. Centralbl. 1881 

 p. 68. Cl. a. M. D. .N:o 102, 311. Diatomiste II Ph III f. 19,' 20. 



Marine: Grip and Bergen, Norway! lie de Bréhat, the Channel (Grunow). 



12. C. Lagerlieimii Cl. (1893). — Outline elliptical. L. 0,o2to0,o28; B. 0,oi toO.ois mm. 

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

 Strise 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 nniting with very large lunate lateral 

 areas. Striai fine, 25 in 0,oi mm. — Diatomiste II Pl. III f. 21, 22. A. S. Atl. CXC, 46? 



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 striaj. 

 No marginal rim. 



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

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

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

 racter are met with only in the group of Naviculce microstigmaticce and heterosfichce, and in a less 

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



Artificial hey. 



^ I Upper valve with an unilateral horseshoe-shaped marking 

 I — — witliout — — — — — 



2. 



3. 



Lower valve with lateral areas A. inopinata Cl. 



— without — — A. htteromorpha Geun. 



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



narrow linear 4. 



. / Valve apicniate or rostrate 5. 



— not — — 6. 



Costae 6 in 0,oi mm A. mammalis Castb. 



— 19 — — A. dispar Cl. 



„ I Valve short, rhomboid A. baldjikii Btw. 



I — elongated — or lanceolate 7. 



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



' \ — — — — — — — distinct 8. 



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



■ \ — — lanceolate A. botfniea Cl. 



{ 



Kona;l. Sv. Vet. Aka.1. llandl. Band 27. N:o 3. - 24 



