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



32. N. inaculata Bail (1850). -- V. lanceolate, with subrostrate ends. L. 0,00 to 0,12; 

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

 Stri;p fi,.') in 0,oi mm. radiate throughout. Puncta (1 to 7 in 0,oi mm. forming undulating, longi- 

 tudinal rows. — Stauroneis macidafa Bail. Smiths Contr. 1850 p. 40 PI. 11 f. H2. A. Fisclteri 



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



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



Var. caribrea Cl. (1875). — L. 0,o,'i6 to 0,]; B. 0,02.-) to 0,o4 mm. StritL- and puncta 7 in 

 0,01 mm. Central area small. — N. carib. Cl. West Ind. 1). p. 5. A. S. Atl. VI f. 10 12. 

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



33. N. Oniicron Cl. N. 8p. — V. elliptical, with apiculate ends. L. 0,028; B. 0,0 ii mm. 

 Axial and central areas indistinct. Striie 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-lancecdate, with rostrate ends. L. 0,o26; 



B. 0,0 15 mm. Axial area indistinct. Central area very small, rounded. Terminal tissures at 

 distance from the ends. Transverse strife 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. diif'iisa 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. Strife 9 in 0,oi mm., radiate throughout. — Atl. II f. '2i^. Perag. Villefr. 

 p. 49 PI. Ill f. 30. 



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



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

 Striai 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,(H5 mm. Strife 13; puncta 16 in 0,oi mm. 



Marine: Java! 



36. N. siiblyrata (tRUN. (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. Strife 12 in 0,o 1 , 

 jmrallel, 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. 0,04, at the constriction 0,o24 mm. Areas indistinct. Strise 6 in 

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

 PI. II f. 25. 



Marine: Ceylon (Leiid. Fortm.). 



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

 elliptic-lanceolate segments. L. 0,o7; B. 0,o25r>, at the constriction O,oii.'') mm. Areas indistinct. 

 Valve with large irregular puncta. — 1). 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 Uictyoneis. 



