KONCL. HV. VET. AKAOEMIICXS II ANDI.INGAR. i5AND 26. 



N:() 



2. 



I.-);-) 



This speeies is remarkal)le, for its areuate valves, but iii its esseiitial cliai^acteristics seein.s 

 to be nearest allied to N. plicata. 



46. N. suavis Cl. and Grove N. Sp. — V. elliptic-lanceolate, ilat. L. (»,115; B. 0,1,4 

 mm. Axial area very iiarrow. Central area small, rounded. Median line ending clo.se at the 

 margin. Strite 18 in 0,oi mm. equidistant throiighont, finely punetate; puncta about 18 in 

 0,0 1 mm., somevvbat coarser aronnd the central nodule, forming undulating longitiidinal rows. — 

 Pl. III f. 31, 32. 



Marine: Oamaru, New Zealand, fossil (Grove CoU.)! 



47. N. plicatula Grun. Ms. — V. elliptic-lanceolate, with snbacnte ends, convex, witb a 

 more or less distinct loiigitudinal depression on eacb side of the median line. L. 0,o7.'j to 0,115; 

 B. 0,02 to 0.0 2 5 mm. Median line with ap2)roximate central pores and small terminal nodules at 

 the ends of the valve, flexuose. Areas indistinct. StricB 15 to 19 in 0, 01 mm. at the middle, 

 slightly divergent, and 18 to 20 in 0,oi mm. at the ends, parallel, and finely, but distiuctly 

 punctate. — Pl. III f. 28. 



Marine: Gnlf of Naples! Balearic Islands! Madagascar! Seychelles! Japan (Brun Coll.)! 

 This is a very characteristic speeies, remarkable for its undulating median line. 



48. N. iuelegaiis Grove and Sturt (1887). — V. lanceolate, gradually tapering from the 

 middle to the somewhat obtuse ends, where are short transverse diaphragms. L. O, is; B. 0,0:3 mm. 

 Median line with elongated central nodule and small terminal nodules at the ends of the valve. 

 Terminal fissvires indistinct. Areas indistinct. Strise 13 in 0, 01 mm. radiate at the ends, some- 

 times crossed on eacb side of the central nodule by a short and narrow lateral area, punctate; 

 puncta, about 15 in 0, 01 mm., forming undulating longitudinal rows. — Grove and Sturt Q. 

 M. Cl. J. III p. 132 Pl. X f. 6. Icon. n. Pl. \ i. 16. 



Mai'ine: Oamaru, New Zealand, fossil! 



This speeies is a very characteristic form, remarkable for the diaphragms in the ends, as in 

 Pleurostauron. It bears some resemblance to N. Kappa of the same habitat. 



49. N. (Scoliopleiira) tiiinida Bréb. (1849). — V. lanceolate, gradually attenuated to the 

 subacute ends. L. 0,i to 0,i6; B. 0,025 ram. Median line slightly sigmoid. Axial area very 

 narrow; central area small, somewhat elongated. Strite 13 to 14 in 



0,01 mm., in the middle where a few fre(iuently are shorter than 

 the others, more distant, slightly radiate (at the ends transverse) 

 finely punctate. Frustule in the zonal-view rectangular with rounded 

 angles. Connecting zone slightly obliqiie, not complex. — Bréb. in 

 Kiitz. Sp. Alg. p. 77. N. Jenneru W. Sm. B. I). I p. 49 Pl. XVI 

 f. 134 (1853). Scoliopleiira tumida V. H. Syn. p. 112 Pl. XVII 

 f. 11. 13. Pant. III Pl. XVII f. 245. 



Marine and brackish: Franz Josephs Land (Grun.), North 

 Sea! Sebastopol! Ceylon! Sydney! 



Var. adriatica Grun. (1860). — V. 0,027; B. 0,oo8 mm. M.e- 

 dian line strongly sigmoid. StriiC. 12 in 0,oi mm. — Scoliopleiira 

 adriatica Grun. Verh. 1860 p. 554 Pl. V f 24. 



Marine: Adriatic (Grun.). 



I have seen a few living specimens of N. fiiitiida. They bad 



along the zone two chromatophore-plates, with entire margins. Each 



plate contained a row of 6 large, orbicular pyrenoids. At the ends 



of the frustules a number of small granules in lively motion was „ , ., .,, ,, , , _,^^ 

 . OJ ^ tumida with cell-contents 500 



VlSlble. times magnifled. 



