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



f. 5. Pinnularia Johnsonii W. Sm. B. D. XIX f. 179 (1853). Nav. Johns. V. H. Syn. p. 99 

 Suppl. B. f. 28. 



Brackish water: S. coasts England (W. Sm.), Mediterranean Sea! Adriatic! Sumatra! 

 Labuan! Japan (Deby Coll.)! East Cape. North Siberia! Brazil (Deby Coll.)! 



Var. belgica V. H. (1885). — V. linear slightly gibbous in the middle. L. 0,06 to 0,o-; 

 B. 0,007 5 mm. Strise 24 in 0,oi mm. — N. John. v. helg. V. H. Syn. Suppl. B. f. 29. 



Marine: Belgium! 



Var. fasciculata Grun. (1879). — V. linear, not gibbous in the middle. L. 0,os to 0,i2 mm. 

 Striae in the middle 16 to 18, at the ends 21 in 0,oi mm. — GtRun. in CI. M. D. N:o 178. 



Brackish water: Bengal! 



N. Scopulorum is a very characteristic form, which seems not to be very nearly allied to 

 any other species but the following. It occurs frequently with numerous transverse siliceous bars, 

 or in a craticular state, and has then been named Climaconeis Frauenfeldii Geun. Verh. 1862 

 p. 421 PL IV f. 2. Gl. Lorenzii Grun. 1. c. PL V f. 7. CI. linearis Jan. Rab. Hond. p. 6 PL II 

 f. 2 (1862). Stietodesmis australis G-rev. Ed. N. Phil. J. XVIII p. 34 PL I f. 1—4 (1863). 



Var. perlonga Brun (1891). — V. very narrow, linear. L. 0,33 to 0,4; B. 0,oo7 mm. Striae 

 in the middle 18, in 0,oi mm., almost parallel, at the ends 20 in 0,oi mm. convergent, punctate, 

 puncta about 27 in 0,oi mm. — Brun U. Esp. n. p. 39 PL XV f. 2. N. famelica Castr. Osserv. 

 Cicloph. p. 9 (1889) accord, to De Toni. 



Marine: Gulf of Naples (Brun Coll.)! 



35. N. Weissflogii Grun. (1878). — V. rhomboid, with obtuse ends. L. 0,08 to 0,o85; B. 

 0,026 to 0,034 mm. Median line with distant median and terminal pores. Terminal fissures in- 

 distinct. Axial area indistinct.; central area small and elongated. Striae 15 (middle) to 20 (ends) 

 in 0,01 mm., radiate at the ends, punctate, puncta 11 in 0,oi mm. forming longitudinal undulating 

 rows. — Brebissonia? Weissflogii Grun. in CI. "West. Ind. D. p. 7 PL I f. 9. 



Marine: Campeachy Bay! Colon (Deby Coll.)! 



This species is scarcely a Brebissonia, but in my opinion nearer akin to N. rhomhica, having 

 as the last, the terminal nodules at some distance from the ends, and the striae more distant in 

 the middle. 



36. N. (Libellus) rhombica Greg. (1855). — V. rhombic-lanceolate, with subacute ends. 

 L. 0,055 to 0,125; B. 0,013 to 0,024 mm. Median line with the terminal nodules at some distance 

 from the ends. Terminal fissures indistinct. Axial area indistinct. Central area small, orbicular. 

 Striae 14 (middle) to 17 (ends) in 0,oi mm. nearly parallel on the middle part of the valve, con- 

 vergent in the ends, punctate, puncta 13 in 0,oi mm. forming un- 

 dulating longitudinal rows. Frustules in zonal view quadrate, with com- 

 plex connecting zone. — Gres. M. J. Ill p. 40 PL IV f. 16. T. M. S. 

 IV p. 38 PL V f. I. 



Marine: Coasts of Scotland (Greg.), Greenland! Sumatra! Japan 

 (fossil. Tempore)! 



Var. japonica Brun 1891. — L. 0,i3 to 0,2; B. 0,o35 to 0,o5 mm. 

 Striae 13 (middle) to 14 (ends) in 0,oi mm. — Schisonema Japonicum 

 Brun D. Esp. n. p. 43 PL XIV f. 6. 



Marine: Sendai, Japan, fossil! 



The living frustules of N. rhombica have two deeply indented 

 ""■ '-'^5^ d^eT'lSr"'' plates along the connecting zone. 



37. N. (Schizonema Libellus) Grevillei Ag. (1830). — V. lanceolate-elliptical, with obtuse 

 ends. L. 0,03 to 0,o7; B. 0,oi5 mm. Median pores distant, terminal pores at some distance from 

 the end. Axial area indistinct, central area small. Striae 18 to 20 in 0,oi mm. (closer, 20 to 27 



