KONOL. SV. Vl-yr. AKADKMIKNS IIANDLINCAI?. I$AXI) 



26. n:o 2. 183 



Fresh water: Sweden! Finland! England! JJubravica, Hungary, f'os.s. ((Trrun.), Celebes! Hawaji! 

 New Zealand! Anstralia (Daintree River! Mitehell River! Australian Al])s! Tasmania!) Nova 

 Scotia! Illinois! Mexico! Jamaica! Ecnador! 



Var. major (tRUN. (18S()). — V. slender, lanceolate. L. (>,(»: to (),i(i; H. (),iiii mm. Sti'ia- II 

 to 10 in (),()) mm. distinctly pnnctate. — Gri'n. in V. H. Syn. PI. XXIV i'. 12. (i. h eh ride use 

 Greg. M. J. II PI. IV f. 19? 



Fresh water: New Zealand! Rhode Island! Demerara River! 



Var.y laiicenlafa KtJTZ. (1844). — V. lanceolate-clavate, with apiculate apex. L. 0,1):,-); 

 B. 0,0 1 mm. Axial area narrow; central area narrow, transverse. Strite K! in 0,oi mm. — Kutz. 

 Bac. p. 87 PI. XXX f. 59. V. H. Syn. XXIV f. 11. G. Turris rar. npirulata (:^run. D. of 

 Banka p. 10 PI. I f. 12. 



Fresh water: Trinidad (Kiitz, Grnn.), Banka (Grnn.). 



Var. varicidacca W. Sm. (18r)6). — V. almost symmetrical to the transverse axis, lanceo- 

 late. L. 0,o3r, to 0,047; B. 0,007 to 0,01 mm. Strife 11 to 14 in 0,ui mm., indistinctly punctate. 

 -- \V. Sm. B. D. II p. 98. V. H. Syn. XXIV f. 13, 14. 



Fresh water: Edinlmrgh Bot. Garden (W. Sm.)! New Zealand! 



G. gracile comprises a large nnmber of closely connected forms, some of which ai'e nearly 

 akin to G. infricatinn. some to G. Janceolafuni Ehb. 



8. G. t'-ymbella Brun (1891). — V. linear, slightly idavate with obtuse apex and basis, 

 slightly lunate. L. 0,o5 to 0,o65; B. 0,oii mm. Axial area narrow, (-entral area transver.se not 

 reaching the margin, with a conspicnoiis stigma. Strite almost parallel (! to 7 in 0,01 mm. — Brun 

 D. esp. n. p. -IH PI. XIX f. 2. 



Fresh water: South Africa, Rio de la Plata. Cape Horn (Brun). 



9. O. laiiceolatum Ehb. (1843). — V. lanceolate, elavate, gradually tapering from the 

 middle to the obtuse apex and basis. L. 0,o27 to 0,07; B. 0,oi mm. Axial area narrow linear. 

 Central area small, rounded, with one unilateral .stigma. Strite 12 to 13 in 0,01 mm., .slightly 

 radiate, coarsely punctate; puncta 22 to 24 in 0,oi mm.; the median stria oppo.site to the stigma 

 shortened. — Ehb. Am. PL II: 1 f. 37. G. affhir Kutz. Bac. p. S6 PI. XXX f. 54 (1844). V. H. 

 Syn. PI. XXIV f. 8 to 10. G. Szahoi Pant. Ill PI. II f. 34 (1893)? 



Fresh water: Mexico! Jamaica! Ecuador! Lake Tacarigua, Trinidad (V. H. Syn.), Marquesas 

 Islands! New Zealand!- 



Var. insif/uis GRE(f. (I806). • — At the type, but with coarser stritie, 9 to 10 in 0,(ii mm.; 

 puncta IS to 22 in 0,01 mm. — G. insufuis Greg. M. J. IV PI. I f. 39. V. H. S. PI. XXIV f. 39 to 41. 



Fresh water: Scotland (Greg.), Bengal! Victoria, Australia! Ecuador, San Nicolas! 



Var. hrngaloisis Grun. (1880). — More elavate. L. 0,03 to 0,o.t7; .B. 0,009 mm. Striai 8 

 to 9 in 0,01 mm. indistinctly punctate. — G. hengalense Grun. in V. H. Syn. PL XXIV f. 37, 38. 



Fresh water: Bengal (V. H. Syn.). 

 . G. lanceolatum is nearly akin to G. gracile, some of its forms being exceedingly difficult to 

 distinguish from several varieties of that species. Some forms are, on the other hand, very similar 

 to forms of G. suhclavatum. 



10. G. subclavatiini (jtrun. (1878). — V. elavate, with broad rounded apex and someAvhat 

 narrower basis, gibbous in the middle. L. 0,0.35 to 0,07; B. 0,oo8 to O.oi mm. Axial area 

 narrow; central area rounded, with distinct stigma. Striai strong, 9 to 13 in 0,oi mm. obscurely 

 punctate, almost transverse, the median ones often shortened. — G. loiigicrps Ehb. rar. subclarata 

 Grun. Casp. S. Alga' p. 10. G. mejyiianmn v. suhclav. Grun. in V. H. Syn. p. 125 PL XXIII 

 f. 39—43., XXIV f. 1. G. cnmmutatum Grun. V. H. Syn. PI. XXIV f. 2. Fr. Jos. Land D. 

 p. 98 (46) PL I f. 12. G. lonyiceps Ehb. M. G. PI. VII: 3, B f. 9 (1854)? Schum. P. D. p. 187 

 PL IX f. 27? G. CggnHs Strii.se Kliecken f. 17. G. culrareani Ch. a. M. I). N:o 137. G. dichato- 



