KONGL. SV. VET. AKADEMIKNS HANDLINGAU. BAND 26. N:0 2. 81 



4. D. coffaftiformis A. S. (1S74). — V. broadly elliptical. L. 0,o23 to 0,o7 ; B. 0,oi to 0,o3 3 

 mm. Central iiodule quadrate to rectaiig-ular, witli somewliat divergent horns. Furrows narrow. 

 close to the horns. Striee 8 to 10 in 0,oi mm., radiate at the ends, less distinct or imperceptible 

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

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



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

 Var. (lensestriatn A. S. (1881). — Strife 10 in O.oi mm. Lnnnlee large. — Nar. roff. r. dens. 



A. S. Atl. LXX f. 54. 



Marine: .Jamaica (Atl.). 



Var. suhcircularis A. S. (1881). — V. orbicnlar. L. <),04; B. 0,o34 mm. Strise 8 in O.oi 

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

 Marine: ? 



5. D. suborbienlaris Greg. (1857). — V. elliptical with broad, ronnded^ends. L. 0,rj4 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 costce, or with a row of pnncta. Costffi 6 to 9 

 in 0,0 1 mm. — Nar. Smithii rar. suhorhicularis Greg. D. of Clyde p. 487 Pl. IX f. 17. Nav. siih- 

 orhicularis Doniv. 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! Xorth Seal Corsica! Adriatic, Caspian Sea (Grnn.), Ceylon! Mada- 

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

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



Between D. coffcBiformis and JD. suhorhicularis there is no sharp distinction, the furrows 

 Iseing broader, the horns of the central nodule more divergent and the costte usually coarser in 

 D. suhorbicularis than in D. coffmformis. 



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. CostiE 

 about 13 in O, o i mm. — Nai\ compar A. S. Atl. LXX f. 69. 



Marine: ? 



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

 middle. L. O, os to 0,i; B. 0, 026 to 0, 035 mm. Central nodule small, c|i\adrate, its horns parallel, 

 approximate. Furrow narrow, linear. Costae 9 in 0, 01 mm., almost parallel, contiuuing across the 

 furrow. — Nar. achena A. S. Atl. VIII f. 29; XII f. 41. 



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

 wich Islands (Atl.). 



Var. recta Brun. a. Hérib. (1893). — L. 0,i to 0,12; B. 0,02 to 0,023 mm. Costa-. 7 in 0,oi 

 mm. alternating with double rows of obscure pi^ncta, about 14 in O.oi mm. — Nav. reda Brun. 

 a. Hérib. 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. san se- 

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



Marine: Adriatic (Grun.). 



Var. parca A. S. (1875). — V. narrow, elliptical. L. 0,03 to 0,045; B. 0,oi6 mm. Furrows 

 narrowed at the ends. Costa; 10 to 14 in 0,oi mm. — Nar. parca A. S. Atl. VIII f. 20 to •22. 



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



8. D. subnrida 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. subnnda A. S. Atl. XII f. 44. 



Marine: Mazatlan (Atl.). 



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



