184 p. T. CLEVE SYNOPSIS OF THE NAVIOULOID DIATOMS. - 



3. A. gibberula Grun. (1880). — Lanceolate, with obtuse ends. L. 0,0 18 to 0,u2; B. 0,0045 

 to 0,00.^^ mm. Upper V. with wide, lanceolate area. Striae 22 inO,oi nun. Lower V. with narrow, 

 lanceolate axial area, centrally not transversely dilated. Rtriiii about 22 in 0,oi mm. radiate, 

 more distant in the middle than towards the ends. In the zonal view the upper margin of the 

 lower valve is gibbous in the middle. — A. D. p. 22. V. H. Syu. PI. XXVII f. 47 to 49. 



Hot springs: East Indies (Grun.). 



Var. angustior Grun. — Valves narrower. — V. H. T. N:o 139. 



Fi'esh water: Stuttgart. 



4. A. Holstii Ch. (L'^Sl). -— Lanceolate, with obtuse, subrostrate ends. L. 0,028 ; B. (l,(»o'.) 

 mm. Upper V. with broad and lanceolate axial area. Striae. 14 in (),oi mm. subradiate in the 

 middle, parallel at the ends. Lower V. with very narrow axial area, dilated in the middle to a 

 central area not reaching to the margin. StritB 13 (middle) to 14 or lo (ends) in 0,oi mm., ra- 

 diate. — D. from Greenl. and Arg. p. 13 PL XVI f. 6, 7. 



Fresh water: Greenland, Kornak! 



f). A. margiimliitii Grun. (1880). — Elliptical. L. 0,oii to 0,022; B. 0,oo5 to O.oos mm. 

 Upper V. with broad, lanceolate area. Stria; 24 in 0,oi mm. marginal. Lower V. with very 

 narrow or indistinct axial area. Central area large, quadrate. Striae 23 to 27 in (),oi mm. — 



A. D. p. 21. V. H. Syn. PI. XXVII f. 45, 4fi. ArluKuifhidinni (Icliratuliini Schum. Tatra p. (11 

 PI. II f. 22? 



Fresh water, alpine regions: Arctic America! Greenland! Norway (Dovre)! Russian Lap- 

 land ( Fiskarehalfon). 



(3. A. amerieansi Cl. (1S1)3). — Broadly elliptical with obtuse or sul)truncate ends. L. 0,oi:i; 



B. O,nofi mm. Upjiei' V. with broad, lanceolate area and about 1(5 stria' in 0,oi mm., unilaterally 

 interrupted. Lower V. with lanceolate area. Strite about 17 in 0,oi mm., radiate and shortened 

 in the middle of the valve. — Diatomiste II PI. Ill f. 17, 18. 



Fresh water: Crane Pond, North America! 



7. C. bihareiisis Pant. (1880). — Elliptical. L. 0,02:5 to (),o26; B. 0,oi;^ to 0,oig mm. 

 Upper V. with lanceolate area, transversely dilated in the middle, and distinct median line. Striai 

 11 to 12, .5 in 0,01 mm. radiate. Lower V. with marginal, costate and radiate strife, 8 to 12,5 in 

 0,01 mm. and with a row of parallel stria^ (12,.') in 0,oi mm.) along the median line, separated 

 from the marginal striie by narrow lateral areas. — Pant. II p. 57 PI. V f. 90, 94. 



Marine: Bory, Hungary (Pant.). 



Var. minor Pant. (1889). — L. O.oie; B. 0,o8 mm. Upper V. with a row of short stria', 11 in 

 0,01 mm., at some distance from the margin, and enclosing a broad, lanceolate area without median 

 line. Lower V. with 11 striae In 0,oi mm., reaching to the median line. — Pant. II PI. IV f. 75, 7(!. 



Marine: Hungary, fossil (Pant.). 



8. ^' pygmaea Schum. (18(54). — Broadly elliptical, with rounded ends. L. 0,oo7 to 0,oii 

 mm. Striae 15 in 0,oi mm. Upper V. with liroad, lanceolate area. Lower V. with narrow area. 

 — Preuss. D. I Nachtr. p. 19 PI. II f. 11. 



Brackish water: Baltic (Schum.). 



9. C. Pelta A. S. (1874). — Broadly elliptical. L. 0,02; B. 0,0 1.^ mm. Upper V. with 

 broad, lanceolate area. Strife 12 in O.oi mm. marginal. Lower V. witli straight median line. — 

 N. S. D. p. 93 PI. Ill f. 17. Atl. CXCI, (5 to 9. 



Marine: North Sea (A. S.). 



10. C. (|uanieiTiisis Grun. (1862). — Elliptical. L. 0,022 to 0,o^:r^ B. 0,012 to 0,oic. mm. 

 Upper V. with very large, usually irregularly punctate area. Stria- 9 in 0,(ii mm., marginal, not 



