152 



v. T. CLUVE, SYNOPSIS OF TIIE NAVICULOID DIATOMS. 



f. 5. Pinmdaria 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! Adriaticl Sumatra'. 

 Lalinan! Japan (Deby Coll.)! Ea.st Cape. Nortli Siberia! Brazil (Deby Coll.)! 



Var. helgica V. H. (1885). — V. linear sliglitlj' gibbou.s in tlie middle. L. 0,o6 to 0,07; 

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



Marine: Belginm! 



Var. fasciculata Grun. (1879). — V. Hnear, not gibbous in the middle. L. 0,os to O.12 mm. 

 Strise in the middle 16 to 18, at the ends 21 in 0,oi mm. — Grun. in Cl. M. 1). X:o 178. 



Brackish water: Bengal! 



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

 any other species bnt the following. It occnrs freqnently with nnmerous transverse siliceous bars, 

 or in a craticular state, and has tlien been named CUiiiaconeis- Frauenfeldii Grun. Verh. 18fi2 

 p. 421 Pl. IV f. 2. Cl. Loremii Grun. 1. c. Pl. V f. 7. Cl. lineans Jan. Eab. Hond. p. fi Pl. II 

 f. 2 (1862). Sticfodcsmis australis Grev. Ed. N. Phil. J. XVIII p. 34 Pl. I f. 1—4 (1863). 



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

 in the middle 18, in 0,(ii mm., almost parallel, at the ends 20 in 0, 01 mm. convergent, punctate, 

 punota abont 27 in 0,01 mm. — Brun D. Esp. n. p. 39 Pl. XV f. 2. N. fameUca Castr. Osserv. 

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



Marine: Gulf of Naples (Brun Coll.)! 



35. N. Weissflogii Grun. (1878). — V. rhombnid, witli obtuse ends. L. 0,o8 to 0,o8.^; B. 

 0,026 to 0,034 mm. Median line with distant median and terminal pores. Terminal ii.ssnre.'; in- 

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

 in 0,01 mm., j'adiate at the ends, punctate, puncta 11 in 0, 01 mm. foi-ming longitudinal undulating 

 rows. — Brfhissonia? Weissflogii Grun. in Cl. West. Ind. D. p. 7 Pl. I f. 9. 



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



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

 as the la.st, the terminal nndules at some distance from the ends, and the striti? more distant in 

 the middle. 



36. N. (Libellus) iiioin1)ica Greg. (1855). — V. rhombic-laneeolate, with subacute ends. 

 L. 0,o.')5 to 0,125; B. 0,01:! to 11,024 mm. Median line with tlie terminal nodules at some distance 

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

 Strite 14 (middle) to 17 (ends) in 0, 01 mm. nearly parallel on the middle part of the valve, con- 

 vergent in the ends, punctate, punctä 13 in 0, 01 mm. forming un- 

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

 plex connecting zone. — Greg. M. J. III p. 40 Pl. l\ f. 16. T. M. S. 

 IV p. 38 Pl. V f. I. 



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

 (fossil, Tempére)! 



Var. japonica Brun 1891. — L. 0,i,i to 0,2; B. 0,03.5 to 0,05 mm. 

 Striaj 13 (middle) to 14 (ends) in 0, 01 mm. — ScMsonema Japoiiiciim 

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



Marine: Sendai, Japan, fossil! 



The living frustules of N. rlionMca have two deeply indented 

 plates along the connecting zone. 



N. rhombica wiht cell-conteiits 

 .'iOO times magnifiecl. 



37. N. (Schizoiienia LiboUus) Grevillei Ag. (1830). — V. lanceolate-elliptical. with obtnse 

 ends. L. 0, 03 to 0,07; B. 0,015 mm. Median pores distant, terminal pores at some distance from 

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



