KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 26. N:0 2. 97 



Var. x>ermagna Pant. (1889). ' — • V, elliptical, very large. L. 0,oi4 to 0,2; B. 0,075 mm. 

 Costse 4,5 to 5 in 0, 01 mm. alternatiiig with double rows of alveoli, about 9 in 0, 01 mm. — Nav. 

 fusca var. permagna Pant. II p. 46. 



Marine: Bory, Hiingary, fossil! 



D. major is usually coiisidered as a larger form of B. Smithii, with which it is intimately 

 connecfed. Still I find it desirable to separate them, as the sti'uctiire of D. major is mucli coarser. 



68. D. Platessa Cl. and Grove. N. Sp. — V. broadly elliptical-lanceolate. L. 0,o6; B. 0,045 

 mm. Central nodule rnunded-quadrate. Furrows very broad, their outer margins enclosing a lan- 

 ceolate space ^4 3'S broad as the valve and crossed by costse. Costse 7 to 8 in 0,oi mm., alternating 

 with double rows of alveoli (16 in 0, 01 mm.) forming obliquely decussating lines. — Pl. II f. 6. 



Marine: Manilla (Deby CoU.)! Macassar Straits (Grove Coll.)! 



69. D. inirabilis Castr. (1886). — V. elliptical-orbicular. L. 0,o65 to 0,09; B. 0,055 to 

 0,062 mm. Central nodule moderately large, quadrate. Purrows very broad, double, the outer 

 margins of the exteriör enclosing a broadly lanceolate space, about ^,'4 as broad as the valve. The 

 interiör furrows are crossed by costse, the exteriör of costse, alternating with double rows of alveoli. 

 Costae 7 in 0,oi mm. alternating with double rows of alveoli 14 in 0, 01 mm. forming obliqiiely 

 deciissating lines. — Nav. inirabilis Castr. Voyage Challenger D. p. 34 Pl. XXX f. 10. 



Marine: Madagascar (Brun CoU.)! Zebu (Castr.). 



70. D. Yespa Cl. N. Sp. — V. panduriform, with subrhomboid segments. L. 0,05 ; B. 0,oi2 

 at the constr. O, o 6 mm. Central nodule small, its horns approximate. Furrows broad, of the same 

 shape as the valve, crossed by costfe. Costse 11 in 0, 01 mm. alternating with double rows of small 

 puncta, arranged in obliquely decussating rows. — Pl. II f. 5. 



Marine: Java! 



71. D. nitescens Greg. (1857). — V. elliptical-lanceolate. L. 0,o5 to 0,09; B. 0,022 to 0,o36 

 mm. Central nodule small, its horns not very distinct. Furrows wide. Their outer margins en- 

 closing a lanceolate space, Va or more as broad as the valve, crossed by costaä, frequently alternating 

 with double rows of alveoli Costse 6 to 8 in 0,oi mm. alternating with single or near the margin 

 double rows of alveoli, 14 to 16 in 0, 01 mm. — Nav. Smithii var. nitescens Greg. D. of Clyde 

 p. 487 Pl. IX f. 16. Nav. nitescens Donk. B. D. p. 8 Pl. I f. 7. A. S. Atl. VII f. 38 to 41, 

 VIII f. 14 to 16. Finnularia arraniensis 0'M. M. J. VII p. 116 Pl. V. f. 6. Nav. adriatica Grun. 

 Verh. 1860 p. 525 Pl. III f. 17. 



Marine: North Sea! Morocco! Adriatic! Sebastopol! Moravian Tegel (fossil)! Seychelles! 

 Madagascar! Sumbava! Singapore! Australia! Sandwich Islands! S:ta Monica, fossil! Colon! Cam- 

 peachy Bay! 



Var. fossilis Pant. (1889). — L. 0,099; B. 0,04i mm. Costse 7,5 to 8,5 in 0,oi mm. Alveoli 

 not distinct. — Nav. nitescens var. fossilis Pant. II p. 51 Pl. IX f. 163. 



Marine: Hungary, fossil (Pant.). 



Var. fuegiana P. Pbtit (1888). — L. 0,o62; B. 0,0255 mm. Costse 10 in 0,oi mm. — Nav. 

 nitescens var. fuegiana Pbtit Cape Horn D. p. 122 Pl. X f. 6. 



Marine: Cape Horn. 



Var. serratula Grun. (1875). — V. lanceolate. L. 0,09; B. 0,o2i mm. Central nodule small, 

 rounded; its horns indistinct, very approximate to the median line. Furrows broad, forming a 

 lanceolate space, crossed by faint costse, alternating with double rows of indistinct alveoli. Costse 

 6 in 0,01 mm. alternating with (single?) rows of alveoli, 11 in 0, 01 mm. — Nav. serrat. A. S. Atl. 

 VII f. 42, 43 VIII f. 11. 



Marine: Campeachy Bay! Colon (Deby CoU.)! 



KodkI. Sv. Vet. Akad. Handl. Band 26. N:o 2. 13 



