48 p. T. CLEVE, SYNOPSIS OF. THE NAVICULOTD DIATOMS, ' 



Var.? bicuneata Cl. — V. with parallel margins and cuneate ends. L. (),io to (),ii2; B. 0,o4 

 mm. Axial area linear. Central area- transversely dilated, small. Stria; IS in (),im mm., tlie 

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



Marine: Pensacola! Connecticut! 



This variety, determined by Grrun. as N. arahicn, lias neai'ly the same outline as f. 28 

 PI. VI in A. S. Atl. 



Var. fossilis Pant. (1889). — V. with cuneate ends. L. <),((2:; B. 0,oi4 mm. Axial area 

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



Marine: Hungary, fossil (Pant.). 



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

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

 to 14 in 0,0 1 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. Stanroneis srandin. Lagst. Boh. D. p. 47. 

 Sfaur. iHlafata Strose Klieken f. 28? Sfaur. Eiclihormi Schum. Pr. D. p. 189 PI. IX f 5o (18fi2)? 



Marine: North Sea (Bohuslan, Norway)! 



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

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



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

 ends. L. 0,09 to 0,ii; B. 0,o3 to 0,o4 mm. Axial area indistinct; central area small, transverse. 

 Strite 9 to 10 in 0,oi mm., slightly radiate, distinctly punctate; 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. Stria? 11 in 0,01 mm. less distinctly punctate. — 

 A. S. Atl. II f. 2. 



Marine: Campeachy Bay (Atl.). 



Var. dcmins striata A. S. (1881). — L. 0,12; B. 0,04 mm. Striai 11 in 0,01 mm. — Atl. 

 LXX f. 42. 



Marine: Jamaica (Atl.). 



Var. laxppunctata Cl. — L. 0, is; B. 0,o.'j mm. Stride 11 in 0,oi mm.; puncta close towartls 

 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. graniilata Bail (18.54). — V. elliptic-lanceolate. L. 0,045 to 0,ot; B. 0,022 to 0,o32 

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

 Strife 10' in 0,oi mm. slightly radiate througliout. 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 \h.ey 

 form distant, undulating, longitudinal rows. — Smiths Contr. VII f. 1(5. N. polyfiticta (tREV. 

 Ed. N. Ph. J. X p. 28 PI. IV f. 12 (1859). N. Baileyana 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 snbrostrate ends, 

 depressed on both sides of the median line. Depressions large, lunate. L. 0,07 to (),ii; B. 0,04 5 

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

 shai'ply defined. Striic 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 0,01 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.)! 



