KONGL. KV. VET. AKADEMIEN8 HANDLINGAH. BAND 



26. 



N:() 



149 



Var. amphilepfa Ehb. (1843). — L. 0,07 to (),i; \\. (),i»ir> to 0,(12 mm. Striip atirl puiicta 18 

 to 21 ill 0,01 mm. — S. amph. EiiB. Am. 1: 2 t'. <)? M. (i. Tl. XIV f. 18? HiiiUH. U. d'Auvergne 

 p. 77 PI. Ill f. 18 (18i)3). S. gracilis W. Sm. B. D. XIX f. 1«(!. 6'. lanceolata Grun. Verb. 1860 

 p. 5()3. 5. 6or«/aHa Pant. Ill PI. V f . 78; 1893 (S. jaranica?). 



Fresh water: Sweden! Finland! Holstein! England (Sm.), Greenland! Australia, Murray River! 



Var. gcHuitia Cl. — L. 0, 1 to 0, 15; B. 0,o3 to 0,04 mm. Stri;e 14 to 17, puncta about 12 

 in 0,01 mm. — S. phoenicmteron W. Sm. B. D. PI. XIX f. 185. Grun. Verb. I«(i0 p. 5(53. V. H. 

 Syn. p. 67 PI. IV f. 2. Pant. Ill PI. VIII f. 134. S. Brunii Per. in Heril). d'Auvergne p. 7(i 

 PI. Ill f. 22 (1893). 



Fresh water: Sweden! Finland! England! Belgium (V. H.), Switzerland! North America 

 (Canada, Calif.)! Brazil! Argentina! New Zealand! 



Var. Bailcyi Ehb. (1843). — L. 0,i.'5 to 0,2; B. 0,o45 mm. Strife and puncta 12 to 14 in 

 0,01 mm. — S. Bail. Ehb. Am. p. 143. S. pteroidea Bail, (accord, to Ehb.) M. G. PI. XIV f. 5. 



Fresh water: North America (Cherryfield etc. fossil)! 



19. S. (Pleurostauron) parvula Grun. (1878). — V. lineai'-lanceolate, with obtuse or slightly 

 rostrate ends. L. 0,o2 to 0,025; B. 0,oo5 mm. Stauros broad, pervious. Striae. 23 in 0,oi mm. 

 radiate. — Grun. in Cl. M. D. N:o 139. 



Fresh water: Berlin! 



Var. prominidu Grun. Ms. — Linear, with rostrate ends. L. 0,02 to 0,04; B. 0,oo4 to 0,008 

 mm. Strife 25 to 28 in 0,oi mm. 



Fresh or slightly brackish water: Greenland! Finmark, Tana Elf (Grun.), Gulf of Bothnia! 



Var. producta Grun. (1(S80). — V. linear lanceolate, witli rostrate ends. L. 0,03 to 0,04; 

 B. 0.008 mm. Strife 18 to 20 in 0,oi mm. — Stauron. producta Grun. in V. H. Syn. PI. IV f. 12. 



Fresh water: Sweden Skane! Holstein! (Grun.). 



As S. parcula Janisch has described, but not tigured, a form from Angamos Guano (Charac. 

 d. Guano II p. 14), which cannot be identified, for which reason (irrunow's name may be 

 retained. — S. jmrntla Grun. differs from 5. jiroducta only by its smaller size and finer strife, 

 and they may be united. The var. producta is nearly akin to, and seems to graduate into 

 S. Legumen. 



20. S. (Pleurostauron) oblonga Grun. (1867). — V. linear, with broad, rounded ends. 

 L. 0,038 to 0,05; B. 0,0122 mm. Stauros linear, reaching to the margin. Strife transverse, 15 in 

 0,01 mm. — Grun. Nov. p. 20 PI. I f. 15. 



Fresh water: Java, foss. (Grun.). 



I have not succeeded in finding this form in the edible earth from Java, and cannot say 

 anything about its affinities. 



21. S. (Pleurostauron) obtusa Lagst. (1873). — V. linear-lanceolate, with broad, obtuse, 

 not rostrate ends. L. 0,o6 to 0,07; B. 0,oi mm. Stauros broad, reaching to the margin, where it 

 becomes somewhat broader. Strife 19 to 21 in 0,oi mm. — Lagst. Spitsb. D. p. 36 PI. I f. 11. 



Fresh water: Spitsbergen (Lagst.). 



A similar form from Australia (Blue Mountains) has slightly rostrate ends. Another similar 

 form, but with narrow, subacute ends, is described by Lewis (Proc. N. Sc. Philad. 1865 PI. II 

 f. 14) as a variety of S. Lcgunioi. 



22. S. (Pleurostauron) Legumen Ehb. (1843). — V. elongated, biconstricted. Median infla- 

 tion not larger than the others. Ends rostrate. L. 0,o3 to 0,035; B. 0,oo8 mm. Stauros reaching 

 nearly to the margin and not dilated outwards. Striae 27 in 0,oi mm., slightly radiate. Frustules 

 coherent in short bands. — Stauroptera Legumen Ehb. Am. p. 135 PI. I: 2, f. 5 (fide Ktitz.). Staiiro- 

 neis Leg. KtJTZ. Bac. p. 107 PL XXIX f. 11. Greg. M. J. IV PL I f. 9. V. H. Syn. p. 69 

 PL IV f. 11. 



