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



32. N. maciilata Bail (1850). — V. lanceolate, with subrostrate ends. L. 0,o9 to 0,12; 

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

 StriEe 6,5 in 0,oi mm. radiate througtout. Puncta 6 to 7 in 0,oi mm. forming undiilating, longi- 

 tndinal rows. — Stauroneis maculata Bail. Smiths Contr. 1850 p. 40 Pl. Il f. 32. iV. Fisclieri 



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



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



Var. carihcea Cl. (1875). — L. 0,o.'i6 to 0,i; B. 0,025 to U,o4 mm. Strife and piincta 7 in 

 0,01 mm. Central area small. — N. carib. Cl. West Ind. D. p. 5. A. S. Atl. VI f. 10 12. 

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



33. N. Omicron Cl. N. Sp. — V. elliptical, with apiculate ends. L. 0,02 8 ; B. 0,oii mm. 

 Axial and central areas indistinct. Strise 10 in 0, 01 mm. slightly radiate throughout. Puncta 

 10 to 11 in 0,01 mm. — Pl. 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 stri?e 17 in 0,oi mm., slightly radiate thi-onghout, coarsely 

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

 p. 56 Pl. III f. 6. 



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



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

 B. 0,03 mm. On each side of the median line is a longitudinal depression. Axial area narrow; 

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

 p. 49 Pl. III f. 30. 



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



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

 StricE 11 in 0, 01 mm. Puncta 12 in 0, 01 mm. forming undulating longitudinal rows. Valve 

 without longitudinal depressions. 



Marine: Balearic Islands! 



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



Marine: Java! 



36. N. sublyrata Grun. (1883). — V. elongated, constricted in the middle. L. 0,o46; B. 0,oi, 

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

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



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



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

 ments lanceolate. L. O.ie; B. 0,o4, at the constriction 0,024 mm. Areas indistinct. StricE 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 Leuo. Fortm. (1879). - V. strongly constricted in the middle, with broadly 

 elliptic-Ianceolate segments. L. 0,o7; B. 0, 0255, at the constriction 0,oii5 mm. Areas indistinct. 

 Valve with large irregiilar puncta. — I), de Ceylon p. 24 Pl. 11 f. 24. 



Marine: Ceylon (Lend. Fortm.). 



N. hilohata and N. ceylancnsis are unknown to the author and niay possibly represent some 

 forms of Dictyoneis. 



I 



