'I 



184 P. T. OLEVE, SYNOPSIS OF THE NAVIfULOID DIATOMS. 



mum /? sessile KtJTZ. (fide G-ruii.). G. Bréhissonii Kutz. (fide Grun.). G. mexieanum Grun. in 

 V. H. Syn. Pl. XXIV f. 3. G. Kinhcrinnum Pant. III Pl. X f. 162, 165. 



Fresh water: Sweden! Finland! Holstein! Belgium (V. H.), France! England I Neusidlfr See 

 (Grun.), Iceland! Argentina! Cliimborazo, Ecuador! Sandwich Islands! Tasniania! Anckland! Califomia! 



Var. obliqua Grun. (1884). — Cymbelloid bent, asynimetrical to the longitudinal axis. — 

 Grun. Fr. Joseplis L. D. p. (98) 46. 



Var. acuminata Hérib. a. Perao. (1893). — Lanceolate, taperiug towards the narrow fnds. 



— G. suhclav. var. acum. Hérib. a. Perag. D. d'Auvprgne p. 55 Pl. III f. 8. 



Fresh water: Auvergne, fossil. 



Var. Mustela Ehb. (1854). — Biconstricted, with gibbous, obtuse apex. — G. 3Iust. Ehb. M. 

 G. Pl. VII: 3, B. f. 9. ScHUM. P. D. p. 187 Pl. IX f. 30. V. H. Syn. Pl. XXIV f. 4 to 7. 

 G. Scn/iffa SciiUM. P. D. III Nachtr. Pl. II f. 16? 



Fresh water: Beeren Eiland (Lägst.), Finmark! Norway, Dovre! Finland! Gnlf of Bothnia! 



Forma curvata Br. a. Perag. (1893). — Frustnles in fi'ont-view cnrved. — Hérib. D. d'Au- 

 vergne p. 59 Pl. III f. 6, 7. 



Fresh water: Auvergne, fossil. 



Var. monfana Schum. (1867). — Biconstricted, with protracted subtruncate or obtu.se apex. 



— Schum. Tatra p. 67 Pl. III f. 35. V. H. Syn. p. 124 Pl. XXIII f. 33 to 36. G. nrmninatum 

 var. submontana Gutwinsky Fl. Galiz. p. 28 Pl. I f. 23. 



Fresh water: Galiz. (Schum.), Belgium (V. H.), Hungary, fossil (Grun.), Demerara River! 

 G. subclavatum by its variety monfana makes complete transition to G. acuminahtm, the 

 latter comprising forms with acute, the former with obtuse ends. 



11. G. .aeiiiuiiiatiini Fhb. (1838). — V. clavate, more or less biconstricted, with apiculate 

 apex, and narrow basis. L. O, os to 0, 07; B. 0, 009 to 0, 01 mm. Axial area narrow or indLstinct; 

 central area short and narrow, unilateral. Strise. 10 to 11 in 0, 01 mm., slightlj' i'adiate, the median 

 stria opposite to the stigma being shortened. — Ehb. Inf. p. 217 Pl. XVIII f. 4. AV. Sm. B. I). 

 1 Pl. XXVIII f. 238 fl, a-. 



Forma trigonocephala Ehb. (1854). — V. not distinctly biconstricted. Apex cnneate. — 

 G. frie,. Ehb. M. G. Pl. VI: 1 f. 36. V. H. Syn. Pl. XXIII f. 18. 



Forma Bréhissonii Kutz. (1859). — V. slightly biconstricted, with cnneate apex. — G. Bréh. 

 Kutz. Sp. Alg. p. 66. V. H. Syn. XXIII f. 23—26. C. ac. var. Clavus V. H. Syn. Pl. XXIII 

 f. 20. G. acum. W. Sm. B. D. Pl. XXVIII f. 238 a". 



Forma, coronata Ehb. (1840). — V. strongly biconstricfpd. with broad, apiculate apex. — 

 G. coron. Ehb. Abh. 1840 p. 211. G. acum. W. Sm. B. D. Pl. XXVIII f. 238 ^. V. H. Syn. 

 p. 124 Pl. XXIII f. 15. Petit Lac des Vosges f. 2. Ströse Kliecken f. 16. G. acum. V. H. Syn. 

 Pl. XXIII f. 16. G. acum.. var. laticeps V. H. Syn. 1. c. f. 17. 



Forma pusilla Grun. (1880). — As the f. coron. but smaller. L. O.03; B. O.oos mm. — 

 G. acum. var. 2ms. Grun. V. H. Syn. Pl. XXIII f. 19. 



Fresh water: Spitzbergen (Lägst.), Sweden! Finland! Belgium (V. H.), England, (Sm.), Ger- 

 many! Switzeidand! France! Spain! Canada! Massachu.setts! Illinois! 



Var. clongata W. Sm. (1855). — V. slender, elongated, strongly gibbons in the middle and at 

 the apex. L. 0, 07 to 0, 11; B. 0,oi2 to 0,oi7 mm. Strite 12 in 0, 01 mm. coarselj' punctate; puncta 

 about 20 in O.oi mm. — G. elongat. W. Sm. Ann. N. Hist. 1855 p. 6 Pl. I f. 4. B. D. II p. 99. 

 G. acum,. va.r. elong. V. H. Syn. Pl. XXIII f. 22. G. Bréhissonii Greo. M. .1. II Pl. T\ f. 13 

 (1854)? G. acum. var. interm.edia Grun. in V. H. Syn. Pl. XXIII f. 21. 



Fresh water: Scotland! Finland! Vosges! 



Var. Turris Ehb. (1843). — V. very slightly biconstricted with cnneate or apiculate apex. 

 L. 0,04 to 0,06; B. 0,oi3 mm. StriiE 10 to 11 in 0,oi mm. — G. Turris Ehb. Am. p. 128. M. G. 

 Pl. XIV f. 70, 71. V. H. Syn. Pl. XXIII f. 31. 



