KONGL. SV. VKT. AKADKMIKNS HANDLINGAH. HAND 27. N:() 3. 1 HO 



Var. pnsiUa (tRUN. (1880). — L. 0,oi3 to 0,017; B. 0,0(1:! to (),oo4 iniii. Stria; IH to 23 in 

 0,01 mm. — A. D. p. 23. V. H. Syn. PL XXVII f. 33, 34. 



Fresl) water: (xreenlaiul! Norway (Dovre)I 



Var. Jackii Rabh. (18()1). — Broader. L. O,oi.i; B. 0,oo4.5 mm. Stria-, about 25 to 2t) in 

 0,01 mm. — Aclnuudhidhim Jaclii Rabii. Alg. E. X:o 1003. V. H. Syn. PI. XXVII f. 21. 



Fresh water: Baden (Rabh.)! 



4. A. oxilis KuTZ. (1833). — Linear-lanceolate, with rounded ends. L. 0.oi.^> to 0,03; 

 B. (',008 to 0,009 mm. Upper V. with narrow, axial area slightly dilated at the middle. Stria>, 

 parallel, about 21 in 0,oi mm. Lower V. without axial area and with small and rounded central 

 area. Strict slightly radiate throughout, in the middle 20, at the ends 27 in 0,oi mm. — Dec. 

 N:o 12 (according to Lagst.). Grun. A. D. p. 22. V. H. Syn. PI. XXVII f. IG to 19. A. siibhun- 

 garicum GuTW. Materialy p. 2i> PI. I f. 26? 



Fresh water: Belgium (V. H.), Germany! 



5. A. glabrata Grin. (1803). — Linear, with rounded ends. L. O,oi-j to 0,o46; B. 0,oo68 

 to 0,0 13 mm. Upjjer V. with 12 to 13 stricE in 0,oi mm. Lower V. with 13 to 15 stria- in 0,oi 

 mm. coarser in the middle than elsewhere. Frustule with broad connecting zone, and rudimentary 

 diaphragms at the ends. — Verb. 1863 p. 146 PI. IV f. 17. A. D. p. 22. 



Marine: California (CI. M. D. N:o 120). Pacific Ocean, New Zealand, North and South Arae- 

 merica (Grun.). 



Var. nuklandica Grun. (1880). — L. 0,o3.^ to 0,o4 mm. Striae 22 to 24 inO,oi mm. Median 

 strife more distant, 10 to 11 in 0,oi mm. — A. D. p. 22. 



Marine: Auckland (Grun.). 



Akin to this species is probably the incompletely described and figured Cijmbosira ininufula 

 Grun. (Verb. 1863 p. 146 PI. IV f. 27). 



6. A. Biasolettiana Kutz. (1844). — Broadly lanceolate, with obtuse, rounded-truncate ends, 

 somewhat gibbous in the middle. L. 0,o.i5 to 0,o3i; B. 0,006.5 to 0,oo7 mm. Upper V. with narrow 

 linear axial area. Strife parallel, about 25 in O.oi mm. Lower V. without axial area; central 

 area small, rounded. Stria? 25 in 0,oi mm. slightly radiate in the middle. — Syneclra Bias. Kiiiz. 

 Bac. p. 63 PI. Ill f. 22. Achn. Bins. Grun. A. D. p. 22. V. H. Syn. p. 130 PI. XXVII f. 27, 28. 



Fresh water: Hungary (Grun.), Belgium (V. H.). 



Forma minufa Grun. (1880). — L. 0,012 to 0,013; B. 0,0045. Striai 24 in 0,oi mm. — 

 A. D. p. 22. 



Fresh water: Triest (Grun.). 



Var. suhlincaris Grun. — Linear, narrowed at the ends. L. 0,014; B. 0,004 mm. Striffi 17 

 to 22 in 0,01 mm. — V. H. T. N:o 11. 



Brackish water: Belgium (V. H. T.). 



7. A. tieniata Grun. (1880). — Frustule scarcely arcuate. V. linear, with rounded ends. 

 L. 0,02 to 0,03; B. 0,005 mm. Lower V. without areas. Strife about 24 in 0,oi mm. more distant 

 in the middle and closer towards the ends. — A. I), p. 22 PI. I f. 5. 



Marine: Sea of Kara (Grun.). 



8. A. Hiidsoilis Grun. (1881). — Linear-lanceolate or subelliptical, with broad and obtuse, 

 frequently .subrostrate, ends. L. 0,oi5 to 0,035; B. 0,oo5 to 0,oo8 mm. Upper V. with narrow, 

 linear axial area and parallel strife, 15 to 16 in 0,oi mm. Lower V. with narrow axial area; 

 .small and orbicular or subrhomboidal central area. On each .side of the central nodule is a lunate 

 marking. Stria; 14 in 0,oi mm., slightly radiate. — V. H. Syn. XXVII f. 25, 26. 



Brackish water: Hudson River! 



