KONGL. 8V. VET. AKADEMIENS II ANDLINCiAK. HAND 26. NIC) 2. 93 



Var. obloiigclJa N^uELi (1><49). — V. linear elliptieal. L. (),02 toO.oas; B. O.oofis to o.oi mm. 

 Rows of alveoli Ki to 10 in 0,r)i mm. Punota 20 to 2;") in 0,01 mm. -— Nav. ohlonf/rltu }\M(i. KiJTZ 

 Sp. Alg. p. H!)0. V. H. Syn. PI. X f. 12. Nav. ovalis var. fossilis Pant. II p. ;')! PI. Vi f. 11.3 (IHW))? 



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



54. 1). notabilis Grev. (18611). — V. elliptical. L. 0,02-) to (),08; B. 0,02 to 0,o3^ mm. 

 Central nodule large, (piadrate. Furrows linear, arcuate, modoi-ately broad. Transverse costa- 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 (/eiiuina — Rows of alveoli one to three along the margin and one abmg the furrow. 

 Nav. Hofah. Grev. T. M. S. XI p. 18 f. 9. A. S. Atl. VIII f. 46, 47, 48. 



Forma cxph'tu A. S. (1874). — Rows of alveoli filling the 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! Labuan! Sandwich Islands! West Indies! Brazil! 



55. D. Gr«ftii Grun. (1875). — V. elongated elliptical. L. 0,065 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 costre. Costte 7 to 8 in 0,oi mm., alternating with single 

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

 of the furrows. — Nav. Gr^ffii A. S. Atl. VII f. 5, 6. 



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

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



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



Marine: Campeachy Bank (Atl.). 



This species seems to be intermediata between D. tiotabilis and D. fusca. 



56. D. fusca Greg. (1857). — V. elliptical or subrectangular, not constricted. L. 0,o7 to 

 0,14; B. 0,0.38 to 0,07 5 mm. Central nodule moderately large, quadrate. Furrows broad, gradually 

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

 with doiible rows of obliquely disposed puncta. Costie 6 to 10 in 0,oi mm. alternating with rows 

 of more or less quadrate alveoli, forming more or less regular, longitudinal rows, equidistant with, 

 to twice as close as, the costse. 



Var. Pelagi A. S. (1875). — V. rhombic-elliptical. L. 0,055 to 0,o66; B. 0,035 to 0,o4 mm. 

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

 Costte 7 in 0,01 mm. Alveoli 9 in 0,oi mm. forming longitudinal rows, })arallel with the margins. 

 — Nav. Pdaf/i A. S. Atl. VII f. 25, 26. 



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



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

 longitudinal rows of alveoli 6 in 0,oi mm. — Nav. nigricans Pant. Ill PI. XL f. 552. 



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



Var. pseudofusca Pant. (1886). — V. nearly orbicular. L. 0,o52 to 0,087; B. 0,o37 to 0,066 

 mm. Costa; in the middle 9 at the ends 13 in 0,oi mm. Furrows forming a large rhomboid .space- 

 Longitudinal rows of alveoli about 10 in 0,oi mm. — Nav. pseudofusca Pant. I p. 2>! PI. XIII f. 109. 



Marine: Hungary, fossil (Pant.). 



Var. norvegica Cl. — L. 0,o85 to 0,oi; B. 0,o45 to 0,o55 mm. Costpp and longitudinal rows 

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



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



Var. subrectangtdar/s Cl. — V. more or less rectangular. L. 0,85 to 0,13; B. 0,037 to 0,o56 

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

 N Smithii Lonk. B. D. p. 6 PI. I f. 4. 



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



