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



Var. permagna Pant. (1889). — V, elliptical, very large. L. 0,oi4 to 0,2; B. 0,o7 5 mm. 

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

 fusca var. permagna Pant. U p. 46. 



Marine: Bory, Hungary, fossil! 



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

 connected. Still I find it desirable to separate, them, as the structure of D. major is much coarser. 



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

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

 ceolate space ^4 s-s broad as the valve and crossed by costee. Costse 7 to 8 in 0,oi mm., alternating 

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



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



69. D. mirabilis Castb. (1886). — V. elliptical-orbicular. L. 0,o6.5 to 0,09; B. 0,055 to 

 0,0 6 2 mm. Central nodule moderately large, quadrate. Furrows very broad, double, the outer 

 margins of the exterior enclosing a broadly lanceolate space, about ^/^ as broad as the valve. The 

 Interior furrows are crossed by costee, the exterior of costse, alternating with double rows of alveoli. 

 Costse 7 in 0,oi mm. alternating with double rows of alveoli 14 in 0,oi mm. forming obliquely 

 decussating lines. — Nav. mirabilis Caste. Voyage Challenger D. p. 34 PL XXX f. 10. 



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



70. D. Yespa Cl. N. Sp. — V. panduriform, with subrhomboid segments. L. 0,o5; B. 0,oi2 

 at the constr. 0,06 mm. Central nodule small, its horns approximate. Furrows broad, of the same 

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

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



Marine: .Tava! 



71. D. nitescens Greg. (1857). — V. elliptical-lanceolate. L. 0,o.'5 to 0,o9; B. 0,022 to 0,036 

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

 closing a lanceolate space, V^ o^ more as broad as the valve, crossed by costse, 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,oi mm. — Nav. Smithii var. nitescens Greg. D. of Clyde 

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

 VIII f. 14 to 16. Pinnularia arraniensis O'M. M. J. VII p. 116PL V. f. 6. Nav. adriatica Grun. 

 Verh. 1860 p. 525 PL in 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,.^ 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. Petit (1888). — L. 0,062; B. 0,0255 mm. Costse 10 in 0,oi mm. — Nav. 

 nitescens var. fuegiana Petit Cape Horn D. p. 122 PL X f. 6. 



Marine: Cape Horn. 



Var. serratula Grun. (1875). — V. lanceolate. L. 0,09; B. 0,021 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,oi mm. — Nav. serrat. A. S. Atl. 

 VII f. 42, 43 VIII f. 11. 



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



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



