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



Var. permagna Pant. (1889). — V, elliptical, very large. L. 0,oi4 to 0,2; B. 0,075 mm. 

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

 fusca var. permagna Paxt. II p. 4(). 



Marine: Bory, Himgary, fossil! 



D. major is usually considered as a larger form of D. 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,o45 

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

 ceolate space V^ as broad as the valve and crossed by costfe. Costai 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.)! Macas.sar Straits (Grove Coll.)! 



69. D. mirabilis Castr. (1886). — V. elliptical-orbicular. L. 0,o65 to 0,09; B. 0,o55 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 0,01 mm. alternating with double rows of alveoli 14 in 0,oi mm. forming obliquely 

 decussating lines. — Nav. mirabilis Castr. Voyage Challenger D. p. 34 PI. XXX f. 10. 



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



70. D. Vespa Cl. N. Sp. — V. panduriform, with siibrhomboid segments. L. 0,05 ; B. 0,oi 2 

 at the constr. 0,o6 mm. Central nodule small, its horns approximate. Furrows broad, of the same 

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

 puncta, arranged in obliquely decussating rows. — PI. II f. b. 



Marine: Java! 



71. D. nitescens Greg. (1857). — V. elliptical-lanceolate. L. 0,o5 to 0,o9; 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, V2 or more as broad as the valve, crossed by costee, 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 PI. IX f. 16. Nav.. nitescens Donk. B. D. p. 8 PI. I f. 7. A. S. Atl. VII f. 38 to 41, 

 VIII f. 14 to 16. Pinnularia arraniensis O'M. M. J. VII p. 116P1. V. f. 6. Nav. adriatica Grun. 

 Verb. 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. Costee 7,5 to 8,5 in 0,oi mm. Alveoli 

 not distinct. — Nav. nitescens var. fossilis Pant. II p. 51 PI. 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 PI. X f. 6. 



Marine: Cape Horn. 



Var. serratula Grun. (1875). — V. lanceolate. L. 0,09; B. 0,021 mm. Central nodiile 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 



