120 p. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



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

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



Brackish water: Hungary, fossil (Pant.). 



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

 differs from other 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 difficulty. The only species, with which it seems to be 

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

 curvata Pant, and both differ from A. commutata in somewhat closer striae only. 



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

 L. 0,02 to 0,04 6; B. 0,on 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 striae 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 Grun. (1875). — L. 0,o5 mm. Striae 13 in 0,oi mm. interrupted in the 

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



Marine: Campeachy Bank. 



9. A. sarnieusis Gkev. (1862). — Frustule 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 0,05; 

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

 0,01 mm. V. with about 10 to 14 striae in 0,oi mm. — T. M. S. 1862 p. 95 PI. IX f. 12. 



Marine: Guernsey (Grove Coll.)! Macassar Straits (Grove Coll.)! 



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

 Grbv. 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. Grbv. 

 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. 0,035; B. 0,oi9 mm. V. with four equal undulations on the dorsal side. Ends 

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

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



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



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

 truncate. L. 0,03 to 0,05 mm. Zone with numerous, close divisions, 10 to 16 in 0,oi mm., very 

 delicately striate; striae 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 

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

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

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

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

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



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

 wich Islands! Australia, Fischie River! West Indies! 



Var.? perpusilla Grun. (1884). — L. 0,oo9 to O,oii mm. Striae 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.). 



