KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND 26. N:o 2. 85 



Diploneis infernipta is a very variable species, and appears to gradnate into I), incurva. 

 The specimens in the deposits of Hungary are corroded, so that it is not easy tu decide whether 

 they really belong to D. intcrru.pta or not. So far as I can see from the descriptions and figures, 

 there is no difFerence between Nav. Wiesneri and Nav. iiifnriipta var. fos.vilia Pant. The same is 

 also the case with the nearly related forms Nav. Heerii and Nav. Gorjunuoicii Pant. 



21. D. Ouinardiiiiia Brun. (1889). — V. elongated, panduriform, with narrow elliptical seg- 

 ments. L. 0,08 to 0,095; B. 0,oi8 to 0,028; at the constr. 0,oo9 to 0,oi7 mm. Central nodiile 

 small, quadrate; its horns parallel, approximate. Furro\vs very narrow, linear. Costfe 8 in O.öi 

 mm. smooth, almost parallel. — Nav. Guiii. Brun. a. Temp. D. de Japon p. 43 Pl. V f. 9. 



Marine: Madagascar! Snmbava! Maeassar Straits! Japan, fossil (Brun). 



■2-2. D. Adonis Brun. (1889). -- V. stout and panduriform. L. 0,i to 0,125; B. 0,o35 to 

 0,045; at the constr. 0,o24 to 0,o28 mm. Segments elliptical. Central nodule large, quadrate; its 

 horns divergent. Furrows narrow linear. Costse 5 in 0, 01 mm. smooth, curved; strongly incrassate 

 at the margin of the valve (or in certain focus alternatiiig with a punctum). — Nav. Adonis Brun 

 a. Tmv. D. f. du Japon p. 41 Pl. V f. 3. 



Marine: Mexilones! Iquique! Yedo, fossil (Brun). 



Var. gihhosa Brun (1889). — Segments deltoid. — Nac. Adonis v. gihb. Brun 1. c. f. 2. 



Marine: Mexilloiies, Peru! 



Var. Ganymcdes Cl. — L. 0,07 to 0,i ; B. 0,o25 to 0,03; at the constr. 0,o 17 to 0,022. Costfe 

 7 to 8 in 0,01 mm. 



Marine: Peru (Mexillones! Iquique!) Madagascar (Kinker Coll.)! 



Var. Oaniaruensis Cl. — L. 0,045 to 0, 05; B. 0, 015 to U,oi8; at the constr. 0,01 to 0,012 

 mm. Costae 9 in 0,oi mm. — Nav. Apis (xROVE a. Sturt. A. S. Atl. CLXXIV f. 13. 



Marine: Oamaru, New Zealand, fossil! 



D. Adonis comprises a series of forms from the small var. Oaniaruensis to the large typ- 

 ical D. Adonis, which are doubtful as species, as they havc \'ery miich the. appearance of being 

 corroded. 



23. D. liueata Donk. (1858). — V. elliptical to linear-elliptical. L. 0,u4 to 0,08; B. 0,oi'.i 

 to 0,032 mm. Central nodule quadrate; its horns convergent at the ends. Furrows rather narrow, 

 smooth, or with one to two rows of puncta. Costse 9 to 10 in 0,0 1 mm., crossed by a longitudinal 

 line, smooth. - Nav. lineata Donk. T. M. S. VI p. 32 Pl. Hl f. 17. B. D. p. 8 Pl. I f. 8. A. S. 

 N. S. D. Pl. I f. 16, 17. Atl. VII f. 44, LXIX f. 31; LXX f. 67. Nav. adriatica Grun. Verh. 

 1860 p. 525 Pl. in f. 17. 



Marine: North Sea (Coasts of Scandinavia and England)! Mediterranean Sea (Balearie Is- 

 lands, (xulf of Naples)! Adriatic! 



Forma pusilla Cl. — L. 0, 032; B. 0, 014 mm. Costte 11 in 0, 01 mm. 

 Marine: G-alapagos Islands! 



24. D. Vetula A. S. (1875). — V. elliptical, very sUghtly constricted in the iniddle with 

 broad rounded ends. L. 0, 05; B. 0,024 mm. Central nodule broad, quadrate, its horns parallel. 

 Furrows broadest in the middle, gradnally tapering to the ends. Costte 10 in 0,oi mm., crossed 

 near the margin by a line. — Nav. Vetula A. S. Atl. XII f. 49. 



Marine: Sansego (Atl.). 



25. D. Papula A. S. (1875). ~ V. elliptical. L. 0,023; B. 0,oi to 0,oii mm. Central 

 nodule small; its horns somewhat divergent. Furrows linear, narrow. Costee about 13 in 0, 01 

 mm. cTossed by one longitudinal line. — Nav. Papula A. S. Atl. VII f. 45 to 47. 



Marine: Samoa (Atl.) Campeachy Bay (Atl.). 



