KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 27. N:0 3. 33 



Var. maxima Cl. — V. narrow, rliombic-lanceolate. L. 0,i2 to 0,i7; B. 0,02i to 0,024 mm. 

 Axial area narrow, iinilateral. Strise 4,5 to 5 in 0,oi mm., coarsely lineate; lineolse 17 to 18 in 

 0,01 mm. — PI. I f. 36. 



Marine: Adriatic! Grulf of Naples! Sumatra (Dehy Coll.)! Indian Ocean (Deby CoU.)! 



Var. KinJceri Pant. (1889). — V. slightly sigmoid. L. 0,i to 0,io9; B. 0,oi6 to 0,oi8 mm. 

 Strise 5 in 0,oi mm., coarsely lineate. — N. Kinlceri Pant. II p. 49 Pl. IX f. 169. Scoliopleura 

 Szalalensis Pant. II p. 55 Pl. VIII f. 154. 



Marine: Petersburg, Va. foss.! Szäkal, Hungary, fossil! 



78. N. plimata Pant. (1889). — V. narrow, lanceolate. L. 0,o62; B. 0,0125 mm. Axial 

 area distinct; central small. Strise 7,5 in 0,oi mm. slightly radiate in the niiddle, transverse at 

 tbe ends, coarsely lineate. — Pant. II p. 52 Pl. XX f. 308. 



Marine: Hungary, fossil (Pant.). 



I bave not seen this species, which appears to difiPer from N. pennata principally by its 

 less radiate strise and the more distinct axial area. 



79. N. consanguinea Cl. C. Sp. — V. convex, linear lanceolate, obtuse. L. 0, 10 to 0,12; 

 B. 0,0 1 5 mm. Axial area very narrow. Central area large, quadrate. Terminal fissures bayonet- 

 shaped, distant from the ends of the valve. Strise 6 in 0,oi mm., slightly radiate throughout, 

 not distinctly lineate. — A. S. N. S. D. Pl. II f. 32 (without name). 



Marine: North Sea (A. S.), Morocco! 



80. N. compressicauda A. S. (1874). — V. very convex, lanceolate, obtuse, with elevated 

 conical ends. L. 0,ii to 0,19; B. 0, 024 mm. Median line with distant terminal nodules, which 

 are strongly marked. Axial area very narrow; central area orbicular. Strise 6 in 0, 01 mm., 

 radiate in the middle, transverse at the ends, indistinctly lineate. — N. S. D. p. 91 Pl. II f. 35. 

 Atl. XL VI f. 62. 



Marine: North Sea! Morocco! Balearic Islands! Sendai, Japan, fossil (Brun.). 



81. N. annulata Grun. (1880). — V. rhomboidal, obtuse, flat. L. 0,05 to 0,o76; B. 0,025 

 to 0,03 mm. Median line with somewhat distant central pores and terminal pores approximate 

 to the ends. Axial area very narrow; central area large, transverse. Strise 7 in 0, 01 mm. slightly 

 radiate, apparently smooth, crossed at the ends of the valve by a semicircular blank narrow 

 space. — A. D. p. 37. Icon. n. Pl. I f. 38. 



Fresh water: Demerara River! 



This species is an isolated form, the systematic place of which is doubtful. It is no Ach- 

 nanthes, both valves being similar. 



82. N. (Ålloioneis) mediterranea Br. a. Cl. (1891). — V. very convex, linear, obtuse, 

 asymmetrical. L. 0,o9 to 0,13; B. 0,0012 to 0, 00 is mm. Median line excentric. Axial area in- 

 diistinct or narrow. Central area small, unilateral. Strise 5 to 6 in 0, 01 mm., very finely lineate. 

 crossed at least on one side of the valve by one to three narrow, undulating blank bands. — 

 — Brun D. espéces nouv. p. 35 Pl. XV f. 11. Icon. n. Part. I Pl. I f. 32, 33. 



Marine: Balearic Islands! Gulf of Naples! Indian Ocean (Deby CoU.)! Sydney (Brun.). 



Nav. mediterranea KtJTZ is a small form, not determinable by the fig. in Bac. Pl. III f. 17. 

 N. medit.. Grun. 1874 belong to the genus Diploneis. The figure in Brun's D. esp. is not quite 

 characteristic, the asymmetry being not sufficiently marked. 



83. N. (Ålloioneis) scalarifer Brun (1891). — V. narrow, fusiform, acute, very convex and 

 somewhat asymmetrical. L. 0,08 5 to 0,i; B. 0, 01 to 0,oi2 mm. Median line with distant terminal 

 nodules. Axial area linear, unilateral. Strise 4 to 5 in 0,oi mm., parallel throughout, finely 



K. Sv. Vet. Akad. Handl. Band 27. N:o 3. . 5 



