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



Var.? hicuneata Cl. — V. with parallel margins and cuneate ends. L. 0,io to 0,12; B. 0,04 

 mm. Axial area linear. Central area transversely dilated, small. Striae 8 in 0,oi mm., the 

 median more approximate and more closely punctate. — PI. If. 19. 



Marine: Pensacola! Connecticut! 



This variety, determined by Grun. as N. arabica, has nearly the same outline as f. 28 

 PI. VI in A. S. Atl. 



Var. fossilis Pant. (1889). — V. with cuneate ends. L. 0,027; B. 0,oi4 mm. Axial area 

 distinct, not dilated around the central nodule. Striae 12,5 in 0,oi mm. — Pant. II p. 43 PI. V f. 82. 



Marine: Hungary, fossil (Pant.). 



41. N. scandinaTica Lagst. (1876). — V. elliptic-lanceolate, with rostrate ends. L. 0,063 

 to 0,105; B. 0,028 to 0,034 mm. Axial area indistinct. Central area small, transverse. Striae 12 

 to 14 in 0.01 mm. almost parallel, distinctly punctate; puncta about 13 in 0,oi mm. — N. lacustris 

 A. S. N. S. D. p. 88 PI. I f. 29 (1874) Atl. VI f. 30. Stauroneis scandin. Lagst. Boh. D. p. 47. 

 Staur. dilatata Strose Klieken f. 28? Staur. Eichhornii Schum. Pr. D. p. 189 PI. IX f. 55 (1862)? 



Marine: North Sea (Bohuslan, Norway)! 



This species is probably allied to N. carinifera. There is on each side of the median 

 line a narrow, longitudinal depression, which extends to the margin. 



42. N. carinifera Grun. (1874). — V. lanceolate, with the axial part elevated towards the 

 ends. L. 0,09 to 0,n; B. 0,03 to 0,04 mm. Axial area indistinct; central area small, transverse. 

 Strise 9 to 10 in 0,oi mm., slightly radiate, distinctly punctate; puncta 15 in 0,oi mm. — 

 A. S. Atl. II f. 1. 



Marine: Balearic Islands! Campeachy Bay! West Indies! Florida! 



Forma minor. — L. 0,072; B. 0,024 mm. Striae 11 in 0,oi mm. less distinctly punctate. — 

 A. S. Atl. II f. 2. 



Marine: Campeachy Bay (Atl.). 



Var. densius striata A. S. (1881). — L. 0,12; B. 0,o4 mm. Striae 11 in 0,oi mm. — Atl. 

 LXX f. 42. 



Marine: Jamaica (Atl.). 



Var. laxepunctata Cl. — L. 0,i8; B. 0,o5 mm. Striae 11 in 0,oi mm.; puncta close towards 

 the margin, inwards more distant, forming undulate longitudinal rows, 8 to 9 in 0,oi mm. 



Marine: Kobi, Japan (Temp., Perag. Types N:o 188). 



43. N. gramilata Bail (1854). — V. elliptic-lanceolate. L. 0,045 to 0,o7; B. 0,o22.to 0,032 

 mm. Axial area linear, narrowed towards the central nodule and the ends. Central area orbicular. 

 Striae 10' in 0,oi mm. slightly radiate throughout. Puncta closer near the margins, about 13 in 

 0,01 mm., more scattered on the depressed parts on both sides of the median line, where they* 

 form distant, undulating, longitudinal rows. — Smiths Contr. VII f. 16. N. polysticta Grev. 

 Ed. N. Ph. J. X p. 28 PL IV f. 12 (1859). N. Baileyam A. S. N. S. D. PI. I f. 31 (1874). 

 Atl. VI f. 26, 27. 



Marine: North Sea! Mediterranean Sea (Perag.), Bab el Mandeb! Ceylon! Japan! Sydney! 

 Calif, guano (Grev.). 



44. N. transfuga Grun. (1883). — V. elliptic-lanceolate with rostrate or subrostrate ends, 

 depressed on both sides of the median line. Depressions large, lunate. L. 0,0 7 to 0,ii; B. 0,045 

 to 0,06 mm. Axial area indistinct; central area large, dilated outwards, and rounded or not 

 sharply defined. Strise 9 in 0,oi mm., slightly radiate throughout. Puncta closer near the 

 margins (11 to 12 in 0,oi mm.) than on the depressed areas (about 6 in 0,oi mm.), where they 

 form undulating longitudinal rows. — Cl. Vega p. 511 PI. XXXV f. 15. 



Marine: Bab el Mandeb! Seychelles! China ("Weissflog Coll.)! Japan (Brun Coll.)! 



