KONGL. SV. VET. AKADEMIENS HANDLINGAE. BAND 26. N:0 2. 85 



Diploneis interrupta is a very variable species, and appears to graduate into D. incur m. 

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

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

 there is no difference between Nav. W'iesneri and Nuv. Interrupta va.r. fossilis Pant. The same is 

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



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

 ments. L. 0,08 to 0,095; B. O.ois to 0,028; at the constr. 0,oo9 to 0,oi7 mm. Central nodule 

 small, quadrate; its horns parallel, approximate. Furrows very narrow, linear. CosttB 8 in 0,oi 

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



Marine: Madagascar! Sumbava! Macassar Straits! Japan, fossil (Brun). 



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

 0,045; at the constr. 0,02 4 to 0,0 2 8 mm. Segments elliptical. Central nodule large, quadrate; its 

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

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

 a. Temp. D. f. du Japon p. 41 PL Y f. 3. 



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



Var. gilhosa Brun (1889). — Segments deltoid. — Nav. Adonis v. rjihh. Brun 1. c. f. 2. 



Marine: Mexillones, Peru! 



Var. Ganymedes Cl. — L. 0,o7 to 0,i; B. 0,025 to 0,03; at the constr. 0,oi7 to 0,022. Costse 

 7 to 8 in 0,01 mm. 



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



Var. Oamaruensis Cl. — L. 0,o45 to 0,o5; B. 0,oi5 to 0,oi8; at the constr. 0,oi to 0,012 

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



Marine: Oamaru, New Zealand, fossil! 



Z). Adonis comprises a series of forms from the small var. Oamaruensis to the large typ- 

 ical D. Adonis, which are doubtful as species, as they have very much the appearance of being 

 corroded. 



23. D. lineata Donk. (1858). — V. elliptical to linear-elliptical. L. 0,04 to 0,08; B. 0,oi9 

 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. CostiE 9 to 10 in 0,oi mm., crossed by a longitudinal 

 line, smooth. - - Nav. lineata Donk. T. M. S. VI p. 32 PL III 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. Verb. 

 1860 p. 525 PL III f. 17. 



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

 lands, Gulf of Naples)! Adriatic! 



Forma pusilla Cl. — L. 0,o3 2; B. 0,oi4 mm. Costae 11 in 0,oi mm. 

 Marine: Galapagos Islands! 



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

 broad rounded ends. L. 0,05; B. 0,o24 mm. Central nodule broad, quadrate, its horns parallel. 

 Furrows broadest in the middle, gradually tapering to the ends. Costse 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. Costse about 13 in 0,oi 

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



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



