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



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

 Axial area narrow, unilateral. Striae 4,5 to 5 in 0,oi mm., coarsely lineate; Uneolae 17 to 18 in 

 0,01 mm. — PI. I f. 36. 



Marine: Adriatic! Gulf of Naples! Sumatra (Deby Coll.)! Indian Ocean (Deby Coll.)! 



Var. Einkeri Pant. (1889). — V. sligbtly sigmoid. L. 0,i to 0,io9; B. O.oie to 0,oi8 mm. 

 Striae 5 in 0,oi mm., coarsely lineate. — N. KinJceri Pant. II p. 49 PI. IX f. 169. Scoliopleura 

 Ssahalensis Pant. II p. 55 PI. VIII f. 154. 



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



78. N. pinnata Pant. (1889). — V. narrow, lanceolate. L. 0,062; B. 0,oi25 mm. Axial 

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

 the ends, coarsely lineate. — Pant. II p. 52 PL XX f. 308. 



Marine: Hungary, fossil (Pant.). 



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

 less radiate striee and the more distinct axial area. 



79. N. consanguiDea Cl. C. Sp. — V. convex, linear lanceolate, obtuse. L. 0,io 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. conipressicanda 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. Striae 6 in 0,oi 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. annnlata Grun. (1880). — V. rhomboidal, obtuse, flat. L. 0,05 to 0,076; B. 0,025 

 to 0,0 3 mm. Median line with somewhat distant central pores and terminal pores approximate 

 to the ends. Axial area very narrow; central area large, transverse. Striae 7 in 0,oi 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. (AUoioneis) mediterranea Br. a. Cl. (1891). — V. very convex, linear, obtuse, 

 asymmetrical; L. 0,09 to 0,i3; B. 0,0012 to 0,ooi8 mm. Median line excentric. Axial area in- 

 distinct or narrow. Central area small, unilateral. Striae 5 to 6 in 0,oi mm., very finely lineate. 

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

 — Brun D. espfeces 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 Coll.)! 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. (AUoioneis) scalarifer Brun (1891). — V. narrow, fusiform, acute, very convex and 

 somewhat asymmetrical. L. 0,o8 5 to 0,i; B. 0,oi to 0,012 mm. Median line with distant terminal 

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



K. Sv. Vet. Akad. Handl. Band 37. N:o 3. 5 



