KOKGL. SV. VET. AKAUfiMlENS HANDLiNGAH. BAND 26. N:0 2. 81 



4. D. coifaeiformis A. S. (1874). — V. broadly elliptical. L. 0,023 to 0,07; B. 0,oi to 0,o33 

 mm. Centra] nodule quadrate to rectangular, with somewhat divergent horns. Furrows narrow, 

 close to the horns. Strise 8 to 10 in 0,o.i mm., radiate at the ends, less distinct or imperceptible 

 on the furrows, not alternating with puncta or alveoli. — Nav. coffceiformis A. S. N. S. D. p. 88 

 PL I f. 22 PL II f. 13. Atl. VIII f. 7. 



Marine: North Sea! Gulf of Naples! Macassar Straits! Calif. Santa Monica, fossil (Deby Coll.). 

 Var. densestriata A. S. (1881). — Strise 10 in 0,oi mm. Lunulee large. — Nar. coff. v. dens. 



A. S. Atl. LXX f. 54. 



Marine: Jamaica (Atl.). 



Var. suhcircularis A. S. (1881). — V. orbicular. L. 0,04; B. 0,o34 mm. Striae 8 in 0,oi 

 mm. - D. coff. suie. A. S. Atl. LXX f. 53. 

 Marine: ? 



5. D. SttborMciilaris Greg. (1857). — V. elliptical with broad, rounded^ends. L. 0,o4 to 0,053; 



B. 0,024 to 0,032 mm. Central nodule large, quadrate; its horns divergent. Furrows linear, closely 

 following the horns, with faint continuations of the costse, or with a row of puncta. Costse 6 to 9 

 in 0,01 mm. — Nav. Smithii var. suborhicularis Greg. D. of Clyde p. 487 PL IX f. 17. Nav. suh- 

 orlicularis Done. B. D. p. 9 PL I f. 9. A. S. N. S. D. PL I f. 21. Atl. VIII f. 2, 3, 5, not 4. 



Marine: Davis Strait! North Sea! Corsica! Adriatic, Caspian Sea (Gran.), Ceylon! Mada- 

 gascar! Singapore! Labuan! Galapagos Islands! Cape Horn (Petit), Brazil (Atl.), Gulf of Mexico 

 (Atl.) North Carolina! Fossil: Hungary (Pant.), Sta Monica, Cal. ! 



Between D. coffceiformis and D. suborhicularis there is no sharp distinction, the furrows 

 being broader, the horns of the central nodule more divergent and the costse usually coarser in 

 D. suborhicularis than in D. coffceiformis. 



6. D. compar Jan. (1881). — V. linear, with broad, truncate ends. L. 0,05; B. 0,oi mm. 

 Central nodule large, quadrate; its horns divergent at their basis. Furrows narrow, linear. Costse 

 about 13 in 0,oi mm. — Nav. compar A. S. Atl. LXX f. 69. 



Marine: ? 



7. D. advena A. S. (1875). — V. linear-elliptical sometimes slightly constricted in the 

 middle. L. 0,08 to 0,i; B. 0,026 to 0,035 mm. Central nodule small, quadrate, its horns parallel, 

 approximate. Furrow narrow, linear. Costse 9 in 0,oi mm., almost parallel, continuing across the 

 furrow. — Nav. advena A. S. Atl. VIII f. 29; XII f. 41. 



Marine: Cape Good Hope (Atl.), Madagascar! Java (Deby Coll.)! Japan (Deby Coll.)! Sand- 

 wich Islands (Atl.). 



Var. recta Beun. a. HfeiB. (1893). — L. 0,i to 0,12; B. 0,02 to 0,023 mm. Costse 7 in 0,oi 

 mm. alternating with double rows of obscure puncta, about 14 in 0,oi mm. — Nav. recta Brun. 

 a. H^RiB. D. d'Auvergne p. 90 PL II f. 3. 



Marine: Puy du Mur, Auvergne fossil (Br.). Morris Creek Conn. (Brun Coll.)! 



Var. sansegana Grun. (1875). — V. linear-elliptical. L. 0,053; B. 0,oi8 mm. — Nar. sanse- 

 gana Grun. A. S. Atl. VIII f. 27. 



Marine: Adriatic (Grun.). 



Var. parca A. S. (1875). — V. narrow, elliptical. L. 0,o3 to 0,045; B. 0,oi6 mm. Furrows 

 narrowed at the ends. Costse 10 to 14 in 0,oi mm. — Nav. parca A. S. Atl. VIII f. 20 to 22. 



Marine: North Sea, Samoa, Campeachy Bank (Atl.). 



8. D. snbnnda A. S. (1875). — V. gently constricted, with elliptical segments. L. 0,o76; 

 B. 0,022; at the comtr. 0,oi5 mm. Central nodule small, its horns straight, approximate. Furrows 

 linear, dilated in the middle. Costse 10 in 0,oi mm. — Nav. subnuda A. S. Atl. XII f. 44. 



Marine: Mazatlan (Atl.). 



K. Sv. Vet. Akad. Hand. Band 26. N:o 2. 11 



