48 .B P. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



Var.? bicuneata Cl. — V. witt parallel margins and cuneate ends. L. 0,io to 0,12; B. 0,0 4 

 mm. Axial area linear. Central area transversely dilated, small. Strise 8 in 0, 01 mm., the 

 median more approximate and more closely pnnctate. — Pl. I f. 19. 



Marine: Pensaeola! Connecticut! 



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

 Pl. 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. Strise 12,5 in 0,oi mm. — Pant. II p. 43 Pl. V f. 82. 



Marine: Hungaxy, fossil (Pant.). 



41. N. scandinavica Lägst. (1876). — V. elliptic-lanceolate, with rostrate ends. L. 0,o6 3 

 to 0, 105; B. 0,0 2 8 to 0,0 34 mm. Axial area indistinct. Central area small, transverse. Strise 12 

 to 14 in 0,01 mm. almost parallel, distinctly pnnctate; puncta about 13 in 0, 01 mm. — N. laciistris 

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

 Staur. dilatata Ströse Klicken f. 28? Stam: Mchhormi Schum. Pr. D. p, 189 Pl. IX f. 55 (1862)? 



Marine: North Sea (Bohuslän, Norway)! 



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

 line a narrow, longitndinal 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 O, n; B. 0,03 to 0,04 mm. Axial area indistinct; central area small, transverse. 

 Strife 9 to 10 in 0,oi mm., slightly radiate, distinctly pnnctate; puncta 15 in O.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. Striaä 11 in 0,oi mm. less distinctly punctate. — 

 A. S. Atl. II f. 2. 



Marine: Campeachy Bay (Atl.). 



Var. densiits striata A. S. (1881). — L. 0,12; B. 0,04 mm. Stria; 11 in 0,oi mm. — Atl. 

 LXX f. 42. 



Marine: Jamaica (Atl.). 



Var. laxepimctata Cl. — L. 0,i8; B. 0,o.5 mm. Strise 11 in 0, 01 mm.; puncta close towards 

 the margin, inwards more distant, forming undulate longitudinal rows, 8 to 9 in 0, 01 mm. 



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



43. N. gramilata Bail (1854). — V. elliptic-lanceolate. L. 0,045 to 0,07; B. 0,022 to 0,032 

 mm. Axial area linear, narrowed towards the central nodule and the ends. Central area oi-bicular. 

 Striffi 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. polystidn Grev. 

 Ed. N. Ph. J. X p. 28 Pl. IV f. 12 (1859). N. Baileyana A. S. N. S. D. Pl. 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. transfiiga Grun. (1883). — V. elliptic-lanceolate with ro.strate or subrostrate ends, 

 depressed on botli sides of the median line. Depressions large, Innate. L. O, o 7 to 0,ii; B. 0, 114. 'i 

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

 sharply defined. Stritc 9 in 0, 01 mm., slightly radiate throiighout. Puncta closer near the 

 margins (11 to 12 in 0,oi mm.) than on the depressed areas (about 6 in 0,01 mm.), where they 

 form nndiilating longitudinal rows. — Cl. Vega p. 511 Pl. XXXV f. 15. 



Marine: Bab cl Mandeb! Seychelles! China (Weissilog Coll.)! Japan (Brun Coll.)! 



