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



32. N. maculata Bail (1850). — V. lanceolate, with subrostrate ends. L. 0,o9 to 0,i2; 

 B. 0,03,'j to 0,04 5 mm. Axial area linear, narrow. Central area large, somewhat transverse. 

 Strife 6,5 in 0,oi mm. radiate throughout. Puncta 6 to 7 in 0,oi mm. forming undulating, longi- 

 tudinal rows. — Stauroneis maculata Bail. Smiths Contr. 1850 p. 40 PI. II f. 32. iV. Fischeri 



A. S. Atl. VI f. 38 (1875). 



Marine: Marble Head, Mass.! Pensacola, Florida! 



Var. carihcea Cl. (1875). — L. 0,o56 to 0,]; B. 0,o25 to 0,o4 mm. Strise and puncta 7 in 

 0,0 1 mm. Central area small. — N. carib. Cl. "West Ind. D. p. 5. A. S. Atl.' Vl f. 10 12. 

 Marine: "West Indies! Florida! Zanzibar (Atl.), LabuanI Port Jackson! 



33. N. Omicron Cl. N. Sp. — V. elliptical, with apiculate ends. L. 0,o28; B. 0,oii mm. 

 Axial and central areas indistinct. Striae 10 in 0,oi mm. slightly radiate throughout. Puncta 

 10 to 11 in 0,01 mm. — PI. I f. 11. 



Marine: Galapagos Islands! 



34. N. Omega Cl. (1893). — "V. broadly elliptical-lanceolate, with rostrate ends. L. 0,o26; 



B. 0,015 mm. Axial area indistinct. Central area very small, rounded. Terminal fissures at 

 distance from the ends. Transverse strise 17 in 0,oi mm., slightly radiate throughout, coarsely 

 punctate. Puncta 17 in 0,oi mm., forming nearly straight, longitudinal rows. — Diatomiste II 

 p. 56 PI. Ill f. 6. 



Marine: Etretat (Temp. Perag. Types N:o 406). 



35. N. dWusa A. S. (1874). — V. with parallel margins and apiculate ends. L. 0,072; 

 B. 0,0 3 mm. On each side of the median line is a longitudinal depression. Axial area narrow; 

 central area distinct. Striae 9 in 0,oi mm., radiate throughout. — Atl. II f 28. Perag. Villefr. 

 p. 49 PI. Ill f. 30. 



Marine: Gulf of Mexico (Atl.), Mediterranean Sea (Perag.). 



Var.? balearica Cl. — V. in L. 0,052; B. 0,022 mm. Axial area indistinct; central small. 

 Striae 11 in 0,oi mm. Puncta 12 in 0,oi mm. forming undulating longitudinal rows. Valve 

 without longitudinal depressions. 



Marine: Balearic Islands! 



Var. minor Cl. — L. 0,037; B. 0,oi5 mm. Striae 13; puncta 16 in 0,oi mm. 



Marine: Java! 



36. N. snblyrata Grun. (1883). — V. elongated, constricted in the middle. L. 0,o4 6; B. 0,oi, 

 at the constriction 0,oo7 mm. Axial area indistinct. Central area very small. Striae 12 in 0,oi, 

 parallel, distinctly punctate. — Cl. Vega p. 496 PI. XXXV f. 17. 



Marine and brackish: North America (Grun.), Labuan! 



37. N. ccylanensis Leud. Fortm. (1879). -- V. elongated, constricted in the middle; seg- 

 ments lanceolate. L. 0,i6; B. 0,o-i, at the constriction 0,024 mm. Areas indistinct. Striae 6 in 

 0,01 mm. transverse, coarsely punctate; puncta forming longitudinal rows. — D. de Ceylon p. 26 

 PL II f. 25. 



Marine: Ceylon (Leud. Fortm.). 



38. N. bilobata Leud. Fortm. (1879). - V. strongly constricted in the middle, with broadly 

 elliptic-lanceolate segments. L. 0,07; B. 0,0255, at the constriction 0,oii5 mm. Areas indistinct. 

 Valve with large irregular puncta. — D. de Ceylon p. 24 PI. II f. 24. 



Marine: Ceylon (Lend., Fortm.). 



N. bilobata and N. ceylanensis are unknown to the author and may possibly represent some 

 forms of Dictyoneis. 



