186 P. T. CLEVE, SYNOPSIS OF THE NAVICDLOID DIATOMS. 



1. A. Cleyei Grun. (1860). — Lanceolate, obtuse. L. 0,oi3 to 0,024; B. 0,oo6 to 0,oo9 mm. 

 Upper V. witli linear, narrow axial area (sometiraes with rudimentary central nodule, Grrun.). 

 Costce. 9 to 11 in 0, 01 mm., radiate; intermediate spaces distinctly punctate. Lower V. with very 

 narrow axial area and very small or indistinct central area. Striije 18 to 24 in 0,oi mm. strongly 

 radiate, punctate. Median strite more distant than the others. — A. D. p. 21. V. H. Syn. 

 Pl. XXVII f. 5, 7. 



Fresh water: Billingen (Westergötland, Sweden)! G-nlf of Bothnia at Torneå! 



2. A. bottnica Cl. (1891). — Lanceolate, subacute. L. 0,oi7 to 0,032; B. 0,oo.') to 0,oi 

 mm. Upper V. with narrow, linear axial area, and parallel transverse costee, 11 to 12 in 0,oi 

 mm.; intermediate spaces coarsely punctate (puncta 18 in 0,oi mm.). Lower V. with lanceolate 

 axial area. Strise 17 (middle) to 25 in 0, 01 mm., radiate throughout. Among the median strise 

 some shorter ones are frequently intercalated. — A. Glevei var. hottn. — Cl. D. of Finl. p. 52 

 Pl. III f. 4, 5. 



Slightly brackish water: Grulf of Bothnia, at Torneå! 



3. A. dispar Cl. (1891). — Elliptical or lanceolate, with rostrate ands. L. 0,023; B. 0,oo9 

 mm. Upper V. with linear, narrow axial area. Costse parallel, 19 in 0,oi mm., not distinctly 

 punctate. Median costse abbreviate. Lower V. with indistinct axial area and orbicular central 

 area. Strise about 19 in 0, 01 mm. strongly radiate throughout, and in the middle alternately 

 longer and shorter. — D. of Finl. p. 52 Pl. III f. 2, 3. 



Brackish water: Gulf of Bothnia, at Torneå! 



4. A. inopinata Cl. (1893). — Rhomboid, acute. L. 0,027; B. 0,oo9 mm. Upper V. with 

 narrow axial area and, unilaterally, a horseshoe-shaped marking in the middle. Costse 12 in 0, 01 

 mm. almost parallel, not punctate. Lower V. with narrow axial area and quadrate central area, 

 uniting with lunate lateral areas. Strise 14 in 0,oi mm., radiate, not distinctly punctate. — 

 Diatomiste II p. 57 Pl. III f. 13, 14. 



Marine: Baldjik (near Varna) fossil! 



5. A. heteroniorpha Grun. (1880). — Rhomboid to lanceolate. L. 0,046 to 0,os; B. 0,o2 to 

 0,0 2 5 mm. Upper V. with narrow axial area and a horseshoe-shaped, unilateral marking in the 

 middle. Costse 8 to 10 in 0, 01 mm., slightly radiate, indistinctly (finely Grun.) punctate. Lower 

 V. with broad lanceolate central area. Strise 7 (middle) to 9 (ends) in 0, 01 mm. strongly radiate 

 throughout. — A. D. p. 23. Cl. Diatomiste II Pl. III, 11, 12. 



Fresh water: Demerara River! 



(). A. danica Flögel (1873). — Rhomboid, acnte. L. O.ose to 0,o.'); B. 0,oii to 0,01.5 mm. 

 Upper V. with narrow axial area. Costse 8 to 13 in 0, 01 mm. slightly radiate or almost parallel, 

 alternating with fine lineolse, twice as close as the costse. Lower V. with narrow axial area and 

 transverse central area, fimbriate at the ends. Strise about 26 in 0, 01 mm. strongly radiate 

 throughout, in the middle alternately longer and shorter. — C. danica Flögel Pommerania D. 

 p. 91 f. 14. Ack. danica Grxjn. A. D. p. 21 (1880). A. heferopsis Grun. CL M. D. N:o 154 (1878). 

 Sfauroneis cornuta Leud. Fortm. D. de Ceylon p. 37 Pl. III f. 36 (1879). Schisostauron fimbriatum 

 Grun. Hedwigia 1867 p. 28. 



Marine: North Sea (Grip in Norway)! Mediterranean Sea! Adriatic (Grun.), Florida! 



Var. major Cl. — L 0,o7 to O, os; B. 0,03 to 0,o3.'j mm. Upper V. with 9 subradiate and 

 anastomosing costie in 0,oi mm. Lower V. with 16 distinctly punctate strise in 0, 01 mm. — 

 Pl. III f. 8, 9. 



Marine: Baldjik, fossil! 



7. A. Lorenziaiia Grun. (1862). — Lanceolate, subacute. L. 0,04 to 0,0.'-,; B. 0,022 ram. 

 Upper V. witli narrow laiicenlate axial area, and strong, vory slightly radiate costse, 7 in 0,oi 



