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



1. A. Clevei Grun. (1860). — Lanceolate, obtuse. L. 0,oi3 to 0,024; B. 0,oog to 0,00'.) mm. 

 Upper V. with linear, narrow axial area (sometime.s with rndimentary central nodnle, Gnin.). 

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

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

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

 PI. XXVII f. 5, 7. 



Fresh water: Billingen (Westergotland, Sweden)! Gulf of Bothnia at Tornea! 



2. A. bottuica Cl. (1891). — Lanceolate, subacute. L. 0,017 to 0,032; B. 0,oo5 to 0,oi 

 mm. Upper V. with naiTow, linear axial area, and parallel transverse cost(C, 11 to 12 in 0,oi 

 mm.; intermediate spaces coarsely punctate (puncta 18 in 0,01 mm.). Lower V. with lanceolate 

 axial area. Stripe 17 (middle) to 25 in 0,oi mm., radiate throughout. Among the median striae 

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

 PI. Ill f. 4, 5. 



Slightly brackish water: Gulf of Bothnia, at Tornea! 



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

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

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

 area. Strife about 19 in 0,oi mm. strongly radiate throughout, and in the middle alternately 

 longer and shorter. — D. of Finl. p. 52 PI. Ill f. 2, o. 



Brackish water: Gulf of Bothnia, at Tornea! 



4. A. iuopinata 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. Costie 12 in 0,oi 

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

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

 Diatomiste II p. 57 PI. Ill f. 13, 14. 



Marine: Baldjik (near Varna) fossil! 



5. A. heteroniorplia Grun. (1880). — Rhomboid to lanceolate. L. 0,046 to 0,os; B. 0,02 to 

 0,02.'') mm. ll^pper V. with narrow axial area and a horseshoe-shaped, unilateral mai-king in the 

 middle. CostcE 8 to 10 in (),oi mm., slightly radiate, indistinctly (finely Grun.) punctate. Lower 

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

 throughout. — A. D. p. 23. Cl. Diatomiste II PI. Ill, 11, 12. 



Fresh water: Demerara River! 



(). A. daiiica Flogel (1873). — Rhomboid, acute. L. 0,o36 to 0,0.^; B. O,oii to 0,01.^ mm. 

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

 alternating with fine lineoliB, twice as close as the costae. Lower V. with narrow axial area and 

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

 throughout, in the middle alternately longer and shorter. — C. danica Flogel Pommerania i). 

 p. 91 f. 14. Ach. (Janica Grun. A. I), p. 21 (1880). .4. heteropsis Grun. Cl. M. D. N:o 154 (1878). 

 Sicmroneis cornitta Leud. Fortm. I), de Ceylon p. 37 PI. Ill f. 36 (1879). Scliizostauroti flmhriutum 

 Grun. Hedwigia 1867 p. 28. 



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



Var. major Cl. — L 0,07 to 0,o8; B. 0,03 to 0,o3.t mm. Upper V. with 9 subradiate and 

 anastomosing costiB in 0,oi mm. Lower V. with 16 distinctly punctate stritc in 0,01 mm. — 

 PI. Ill f. 8, 9. 



Marine: Baldjik, fossil! 



7. A. Loronziana Grun. (1862). — Lanceolate, subacute. L. 0.04 to OjO.-s ; B. 0,022 mm. 

 Upper V. with luirrow lanceolate axial area, and strong, very slightly radiate costae, 7 in O.oi 



