KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 26. N:0 2. 93 



Var. oblongella NyEgeli (1849). — V. liiiear elliptical. L. 0,o2 to 0,o:38; B. 0,oo65 to o,oi mm. 

 Rows of alveoli 13 to 19 in 0,5 1 mm. Pimcta 20 to 25 in 0,oi mm. — Nav. oblongella Nveg. Kutz 

 Sp. Alg. p. 890. V. H. Syn. Pl. X f. 12. Nav. ovalis var. fossilis Pant. II p. 51 Pl. VI f. 115 (1889)? 



Fresh water: Iceland! Finland! Paris! Königsberg, fossil! 



54. D. notabilis G-rev. (1863). — V. elliptical. L. 0,o2r, to 0,o8; B. 0,02 to 0,o3s mm. 

 Central nodule large, quadrate. Furrows linear, arcuate, moderately broad. Transverse costai 7 

 to 10 in 0.01 mm. alternating with large, elongated alveoli, forming 4 to 5 longitudinal, undulating 

 rows, more close towards the margins. 



Forma genuina — Rows of alveoli one to three along the margin and one along the furrow. 

 Nav. notah. Grbv. T. M. S. XI p. 18 t 9. A. S. Atl. VIII f. 46, 47, 48. 



Forma expleta A. .S. (1874). — Rows of alveoli fiUing tlie whole space between the furrow 

 and the margins. -^ N. notabilis var. expleta A. S. N. S. D. I f. 20, II f. 11. Atl. VIII f. 49 to 52. 



Marine: North Sea! Mediterranean Sea! Black Sea! Red Sea! Ceylon! Madagascar ! Cape of 

 Good Hope! Java! Labiian! Sandwich Islands! West Indies! Brazil! 



55. D. Grieftii Grun. (1875). — V. elongated elliptical. L. 0,o65 to 0,12; B. 0,025 to 0,042 

 mm. Central nodule small, rounded quadrate. Furrows broad, gradually narrowed from the middle 

 and crossed by faint prolongations of the costte. Costpe 7 to 8 in 0, 01 mm., alternating with single 

 rows of quadrate alveoli, 8 to 11 in 0, 01 mm. and forming 7 to 8 longitudinal rows on each side 

 of the furrows. — Nav. Grreffii A. S. Atl. VII f. 5, 6. 



Marine: Bab el mandeb! Seychelles! Madagascar! Manilla! Java! Sunibava! Labuan! Japan 

 (Atl.), Samoa (Atl.), Tahiti! 



Forma minor. — L. 0,o6; B. 0,oi8 mm. — A. S. Atl. VIII f. 33. 



Marine: Campeachy Bank (Atl.). 



This species seems to be intermediata between I), notabilis and B. fusca. 



56. D. fnsca Greg. (1857). — V. elliptical or subrectangular, not constricted. L. O, o 7 to 

 0,14; B. 0,038 to 0,075 mm. Central nodule moderately large, quadrate. Furrows broad, gradually 

 tapering from the middle and crossed hy faint prolongations of the costtB, frequently alternating 

 with double rows of obliqiiely disposed puncta. CosttB 6 to 10 in 0,oi mni. alternating with rows 

 of more or less quadrate alveoli, forming more or less regi^lar, longitvidinal rows, eqiiidistant with, 

 to twice as close as, the costee. 



Var. Pelagi A. S. (1875). — V. rliombic-elliptical. L. 0, 055 to 0,066; B. 0, 035 to 0,o4 mm. 

 Central nodule large, rounded quadrate. Fiirrows broad, semilanceolate, crossed by rows of alveoli. 

 CostsB 7 in 0,01 mm. Alveoli 9 in 0, 01 mm. forming longitudinal rows, parallel with the margins. 

 — Nav. Pelagi A. S. Atl. VII f. 25, 26. 



Marine: Campeachy Bay! Colon (Deby CoU.)! Tahiti! 



Var. nigricans Pant. (1893). — V. narrow elliptical. L. 0,25; B. 0,o7. Transverse and 

 longitudinal rows of alveoli 6 in 0, 01 mm. — Nav. nigricans Pant. III Pl. XL f. 552. 



Marine: Bory, Himgary, fossil (Pant.). 



Var. pseiidofusca Pant. (1886). — V. nearly orbicular. L. 0,052 to 0,o87; B. 0, 037 to 0,o66 

 mm. CostcE in the middle 9 at the ends 13 in 0, 01 mm. Furrows forminga large rhomboid space- 

 Longitudinal rows of alveoli abont 10 in 0, 01 mm. — Nav. pseudofusca Pant. I p. 28 Pl. XIII f. 109. 



Marine: Hungary, fossil (Pant.). 



Var. norvegica Cl. — L. 0,08 5 to 0,oi; B. 0, 04 5 to 0,055 mm. Costaj and longitudinal rows 

 of alveoli 10 in 0,oi mm. — iV. fusca A. S. Atl. VII f. 2, 3. 



Marine: North Sea! Hungary, fossil (Deby Coll.)! 



Var. subrectangularis Cl. — V. more or less rectangular. L. 0,85 to 0, 13; B. 0,037 to 0,o5 6 

 mm. Costse and longitudinal rows of alveoli 8 in 0, 01 mm. — Nav. fusca A. S. Atl. VII f. 4. 

 N. Smithii Donk. B. D. p. 6 Pl. I f. 4. 



Marine: North Sea! Balearic Islands! Sumatra (Deby Coll.)! 



