182 p. T. CLKVE, SYNort>IvS OF THE NAVICULOID IMATOMN. - 



Var. dicliotoina Ki'TZ (]s;3o). — L. U,u4 to (),(»•;; B. (),uo8 mm. Stritr 11 to 18 in 0,oi mm. 

 — G. dichot. KtJTZ. Syn. D. p. ^AV.) f. 48. Bacil. p. «5 PL VIII f. U. W. 8m. B. D. PL XXIX 

 f. 241? G. intr. var. ilich. V. H. Syn. p. 125 PL XXIV f. HO-^L G. pulriudtmn Al. Br. in Rab. 

 Stissw. D. p. 58 (1853). V. H. Syn. f. 32 to 34. 



Fresh water: Finland! Zurich! Australia (Victoria, Lake Muir, Tasmania)! 



Var. fossilis Pant. (1889). — L. 0,04.^; B. 0,oo7.^ mm. Striiv. 10 to 12, .-j in U.oi mm., the 

 median more distant, 7,5 in 0,oi mm. — Pant. II p. 5(i PL XI f. 201. 



Brackish water: Hungary, foss. (Pant.). 



Var. Vibrio Ehb. (1843). — V. very slender and narrow, linear, slightly gibbous in the 

 middle, with rounded-truncate often gibbous ends. L. 0,o.s to O,oii; B. 0,oi to 0,oi2 mm. Stripe 

 10 in 0,0 1 mm. distinctly punctate. — G. Vibrio Ehb. Verb. p. 128 PL II: i f. 40. Microg. W. Sm. 

 B. D. PL XXVIII f. 242. V. H. Syn. PL XXIV f. 2()— 27. (;. Cygmis Schum. P. D. ]>. 187 

 PL IX f. -liV^ 



Fresh water: Finland! (iermany, Erlat' See (Grun.), Hungary, Dnbravica, fossil (Grun.), 

 Seychelles! 



To this species probably belongs G. Jm)i(/aricum Pant. Ill PL II f. 28 (1893). 



5. (j. subtile Ehb. (1843). — V. narrow, elongate, d biconstricted, with broad, rounded- 

 truncate apex. L. 0,04 5; B. 0,oo7 mm. Axial area indistinct; central area narrow, unilateral, 

 transverse. Striae 12 in 0,oi mm., almost transverse, distinctly punctate. — Ehr. Am. p. 128. 

 Greg. M. J. IV PI. I f. 12. Schum. P. D. I Nacht. PL II f. 19. V. H. Syn. PL XXIII f. 13, 14. 



Fresh water: Scotland! Finland! Holstein! Bengal! 



Var. Sagitta Schum. (18(i3). — As the type, but with cuneate apex. — G. Sagitta Schum. 

 P. D. p. 187 PL IX f. 29. V. H. Syn. PL XXIII f. 27. 

 Fresh water: Prussia (Schum.). 



6. G. .semijipertum Grun. (1880). — V. elongated, clavate, with broad apex and basis. L. 

 (»,o6 to 0,07; B. 0,011 to 0,01.3 mm. Axial area distinct, linear; central area a large, transverse 

 fascia, with a distinct stigma on one side and frequently marginal strife on the other. Stria- 10 

 to 11 in 0,01 mm., slightly radiate, punctate; puncta about 21 in 0,oi mm. — Grun. in V. H. Syn. 

 PL XXIV f. 42. (Jl. M. D. N:o 264. 



Fresh water: California, Shasta Co (Grun.), Oregon, Pitt River (Grove Coll.)! 



7. 0. gracile Ehb. (1838). — V. elongated, linear to lanceolate, with acute to subacute apex 

 and basis. L. 0,o25 to 0,07; B. 0,o4 to 0,oiii mm. Axial area very narrow; central area narrow, 

 transverse. Stria? transverse, 9 to 15 in 0,oi mm. 



Var. cymbdioides Grun. Ms. — V. slightly asymmetrical to the longitudinal axis, with gently 

 curved dorsal margin and nearly straight ventral margin. L. (),o,t; B. 0,oo5 mm. Stria> abont 

 Ifi in 0,01 mm. 



Fresh water: Norway, Dovre! Sweden, Helsingland, Arbra! 



Var. mirita Al. Br. (1853). — V. narrow, linear-lanceolate. L. 0,024 to 0,04; B. O.005 to 

 0,006 mm. Striae 15 to 16 in 0,oi mm. Living cells with two horn-like processes at the end. — 

 G. aur. Al. Br. in Rabh. Siissw. D. p. 59 PL VIII f. 3. V. H. Syn. XXIV f. 15 to 18. G. an- 

 gustum Schum. I Nachtr. PL II L 17? 



Fresh water: Baden, Titisee (A. Br.). Finland! Norway, Dovre! Iceland! U. St. Bemis Lake, 

 White Mountains! 



Var. dicliofontnm W. Sm. (1853). — Linear-lanceolate, slightly clavate. with obtuse ends. 

 L. 0,04 to 0,0.5; B. 0,007 mm. Stria 12 to 14 in 0,oi mm. tinely ])uiictate. — G. dichotonnvm 

 W. Sm. Br. D. I p. 79 PL XXVIII f. 240. G. (gracilc var.?) dichofommn V. H. Syn. PL XXXV 

 f. 19 to 21. G. tenellum W. Sm. B. D. PL XXIX f. 243? G. Vibrio Schum. Tatra PL HI f. 38? 

 G. hebrkknae Hl^RlB. I). d'Auvergne p. 61 PL III f. 9? 



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