KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 27. N:0 3. 25 



in 0,01 mm., radiate tliroughoiit, finely lineate, the median alternately longer and shorter. — 

 Atl. XL VI f. 15. 



Fresh water: Fort Ludlow (Atl.), Shasta Co. Calif., fossil! Oregon! Minnesota (interglacial 

 deposit) ! 



39. N. ralida Cl. a. G-rdn. (1880). — V. slightly asymmetrical, elliptic-lanceolate. L. 0,(ir>7 

 to 0,1 1; B. 0,022 to 0,02B mm. Axial area narrow, asymmetrical. Central area irregnlar, some- 

 what asymmetrical. Strite 7,?, to 8 in 0,oi mm., distinotly lineate, radiate thronghout, the median 

 alternately longer and shorter. — A. D. p. 32 Pl. 11 f. 29. Cl. Vega p. 4(56. 



Marine: Sea of Kära! Cape Wankarema! 



Var. minuta Cl. (1883). — L. 0,025; B. 0,oi.'i mm. Strise 8 in 0,oi mm., not alternately 

 longer and shorter. — Vega p. 466. 



Marine: Cape Wankarema! 



Var.? capensis Cl. — L. 0,o56; B. 0,oi9 mm. Stinse 8 in 0,iji mm. not distinctly lineate, 

 radiate thronghout. Axial area symmetrical. Central area larger. 



Marine: Cape of Good Hope! 



The type is most nearly akin to ISl. Gastrum var. Jenisseyensis but has more distinctly 

 lineate strise. The var. capensis is very doubtful as a form of JSf. valida. 



40. N. Hasta Pant. (1893). — V. lanceolate, gradually tapering from the middle to the 

 subacute ends. L. 0, 07 to 0,09; B. 0,oi5 mm. Axial area narrow, slightlj^ dilated in the middle. 

 Striee 9 in 0, 01 mm. strongly radiate thronghout and coarsely lineate. Among the median strise 

 some few shorter ones are intercalated. — Pant. III Pl. V f. 74; Pl. XIV f. 213. 



Habitat?: Köpecz, Hiingary, fossil (Pant.). 



41. N. iraperfecta Cl. (1883). — V. elliptical to elleptic-laneeolate, frequently with sub- 

 rostrate ends. L. 0,oGä; B. 0, 03 mm. Axial area unilateral, narrow. Central area small. Strite 

 8 in 0,01 mm. radiate thronghout, finely lineate and crossed by several longitudinal and undulating 

 narrow blank bands. — Vega p. 466 Pl. XXXVI f. 34. 



Marine: Sea of Kära! Cape Wankarema! 



This form is very nearly akin to A\ valida, from which it difPers by its striai being 

 divided into 2 to 4 lengths, as the striae of N. macidosa Donk. 



42. N. consors A. S. (1876). — V. narrow elliptic-lanceolate, obtuse. L. 0,06 to 0,i; 

 B. 0,015 to 0,02 mm. Axial area narrow; central area transverse, rectangular. Strise 8 in 0, 01 

 mm., radiate thronghout, finely lineate and crossed by 3 to 4 irregularly iindiilating, longitudinal 

 bands. ~ Atl. XL VIII f. 24, 25, 26, 27. N. Leudugeri Cl. Vega p. 505 Pl. XXXVI f. 22 (1883). 



Marine: Ceylon! Samoa (Atl.), Sandwich Island (Atl.), Singapore (Atl.), Java! 



43. N. (Rhoiconeis) genuflexa Kuxz (1844). — V. convex, eUiptic-linear, with obtuse ends. 

 L. 0,02 to 0,04.3; B. 0,004 to 0,005 mm. Axial area indistinct. Central area small, orbicular. Strise 

 18 in 0,01 mm., a little closer at the ends, radiate thronghout. Friistule arcuate. L. 0,02 to 0,03; 

 Height 0,01 mm. — Bac. p. 101 Pl. XXI f. 6. Rhoiconeis genuflexa Grtjn. Verh. 1863 p. 147. 



Marine: Peru (Grun.), New Zealand (Grun.), Port Jackson! Samoa! Labuan! Ceylon! 



44. N. (Rhoiconeis) Bolleana Grun. (1863). — V. linear-lanceolate, with obtuse ends. 

 L. 0,04 5 to 0,095; B. 0,01 to 0,011 mm. Axial area very narrow; central area lai-ge quadrate. 

 Strise 8 (middle) to 11 (ends) in 0, 01 mm. not distinctly lineate, radiate thronghout. Frnstule 

 with broad connecting zone, arcuate. — Rhoiconeis BoUcana Grun. Verh. 1863 p. 147 Pl. IV f. 11. 

 A. S. Atl. XLVII f. 18 (strise strongly punctate)? N. Index Temp. a. Brun D. foss. du Japon 

 p. 44 Pl. V f . 5 (1889). 



K. Sv. Vet. Akademiens Handlingar. Bd 37. Nru 3. 4 



