120 P. T. CLEVE, SYNOPSIS OF THE NAVICULOIB DIATOMS. 



Var. fossilis Pant. (1889). ■ — V. L. 0,065 to 0,o7i; B. 0,oo8 to 0,oii5 mm. Strise about 16 

 in 0,01 mm. — A. fossilis Pant. II p. 36 Pl. I f. 2. A. curvata Pant. II p. 36 Pl. I f. 11. 



Brackish water: Hungary, fossil (Pant.). 



This species, very frequent in brackish water, is of uncertain position in the system. It 

 differs from otber forms of Halamphora in its strongly biarcuate median line and broad, ventral 

 side. It has some resemblance to the species of the subgenus Amphora, but the zone is complex, 

 although the divisions are seen only with difRculty. The only species, with which it seems to be 

 connected, is A. Normani. I am unable to discover any diiferences between A. fossilis and A. 

 curvata Pant. and both differ from A. commutata in somewhat doser strise only. 



8. A. bigil)ba Grun. (1875). — Frustule strongly constricted in the middle, truncate. 

 L. 0,02 to 0,046; B. 0,oi-i to 0,oi8 mm. Zone with numerous, more or less distinct divisions. V. 

 with straight ventral margin and protracted ends. Median line closely approximate to the ventral 

 margin. Dorsal strise delicate, 15 in 0,oi mm. — A. S. Atl. XXV f. 66, 67, 69, 70 to 77. 



Marine: Balearic Islands! Adriatic! Japan (Atl.), Chile (Atl.), Galapagos Islands! West 

 Indies! Campeachy Bay! 



Var. interrupta Geun. (1875). — L. 0,05 mm. Stria; 13 in 0,oi mm. interrupted in the 

 middle of the valve. - A. S. Atl. XXV f. 65. 



Marine: Campeachy Bank. 



9. A. sarniensis Grev. (1862). — Frustnle with a strong constriction in the middle and a 

 shallow one between the middle and the ends, which are rostrate-truncate. L. 0,04 to O, os; 

 B. 0,017 mm. Zone with aboiit 4 divisions in 0,oi mm., transversely striate; strise 9 to 13 in 

 0,0 1 mm. V. with about 10 to 14 stria; in 0,oi mm. — T. M. S. 1862 p. 95 Pl. IX f. 12. 



Marine: Guernsey (Grove Coll.)! Maeassar Straits (Grove CoU.)! 



Var.? sinuata Grev. (1863). — L. 0,0 7 mm. Margin with 7 constrictions. — A. sinuata 

 Grev. E. N. Ph. J. XVIII p. 183 f. 5. 



Marine: Queensland (Grev.). 



Var.? flexuosa Grev. (1863). — L. 0,086 mm. Margin with 5 constrictions. — A. flex. Grev. 

 E. N. Ph. J. XVIII p. 183 f. 4. 



Marine: Queensland (Grev.). 



10. A. tetragibba Cl. N. Sp. — Frustule subrectangular, with four undulations on the 

 margins. L. O, oss; B. 0,oi9 mm. V. with four equai undulations on the dorsal side. Ends 

 capitate and incurved. Median line close to the ventral margin. Strise about 10 in 0,oi mm. — 

 A. sarniensis? A. S. Atl. XXV f. 80. A. sinuata aiF. Grun. A. S. Atl. XXV f. 78, 79. 



Marine: Baltjik (Atl.), Japan (Atl.). 



11. A. coifaeiformis Ag. (1827). — Frustule lanceolate, 2 to 3 times longer than broad, 

 truncate. L. O, os to O, os mm. Zone with numerous, close divisions, 10 to 16 in 0,oi mm., very 

 delicately striate; strise about 21 in 0,oi mm. V. narrow with arcuate dorsal, somewhat concave 

 ventral margin, and protracted, capitate ends. Median line close to the ventral margin. Dorsal 

 strise about 20 in 0,oi mm. — Frustiilia coffceiformis Ag. in Regensb. Flora 1827 II p. 627 (accor- 

 ding to Ktitz). Kutz Bac. p. 108. A. S. Atl. XXVI f. 56, 58. A. aponina KtJTZ Bac. p. 108 

 (1844). A. salina W. Sm. B. D. p. 19 Pl. XXX f. 251 (1853). V. H. Syn. p. 57 Pl. I f. 19. A. 

 lineata Greg. T. M. S. p. 71 Pl. I f. 33 (1857). A. Neupaueri Pant. II p. 38 Pl. I f 7 (1889)? 

 A. Taylori Grun. V. H. T. N:o 13. 



Hot springs and brackish water: Sea of Kära! Baltic! Salines of Saxony! Iceland! Sand- 

 wich Islands! Australia, Fischie River! West Indies! 



Var.? ijerpiisilla Grun. (1884). — L. 0,oo9 to 0,oii mm. Strise more than 30 in 0,oi mm. 

 — Grun. Fr. Jos. Land D. p. 102. A. S. Atl. XXVI f. 98. 



Marine: Franz Josephs Land (Grun.), Nice (Atl.). 



