KONGL. SV. VI<yr. AKADKMIKNS HANDLINGAU. HANI) 26. N:() 2. 95 



59. 1). liyperboreji (tRUN. (18()()). — V. elliptical. L. 0, i; B. 0,049 mm. Furrows abruptly 

 bent arouud the large central nodule, ('ostw 7 in 0,oi mm. — Nav. hypcrhorea (4 run. Verb. 18G0 

 p. :y-^\ PI. TIT f. 1(). Nar. propinqua A. S. Atl. VIT f. U? 



Marine: Bohuslan, Sweden ((Irun.). 



Var. excisa A. S. (1874). — V. slightly constricted in the middle. L. 0,09; B. 0,o3 mm. 

 Costa; 9 in 0,oi mm. — Nav. fusca var. excisa A. S. N. S. I^. Tl f. 9. 



Marine: North KSea (Atl.). 



()(). D. vsicillsiiis A. S. (1875). — V. elongated elliptical,' constricted, or not constricted. 

 L. 0,04 to 0,0c; B. 0,0 14 to 0,016 mm. Furrows dilated in the middle, forming in the middle ot 

 the valve a lanceolate space. Costse 9 to 14, alveoli 15 to 21 in 0,oi mm. Alveoli forming longi- 

 tudinal rows parallel with the margins of the areas. 



Forma a. V. con.stricted in the middle. — JSfav. vacillans A. S. Atl. VTTI f. Gl; XTT f. 42, 

 43, 52, 53. 



Marine: Ceylon (Leudnger Fortm.) Rodriguez! Cape Good TTope (Atl.), Japan (Atl.), Samoa 

 (Atl.), Sandwich Island (Atl.), Cape Horn (Petit), Campeachy Bank (Atl.), California (Atl.). 



Forma (i. V. not constricted in the middle. — A. S. Atl. VIII f. 34, 35, 36. — Nav. parra 

 var. prnduda Pant. II p. 52 PI. VIII f. 148 (1889). 



Marine: North Sea (Atl.), Marocco! Balearic Islands! Macassar Straits! Colon (Deby Coll.)! 

 Campeachy Bay (Atl.). 



Var. (hiicaiida Cl. — not constricted. Striae 13 to 14 in 0,oi mm. — A. S. Atl. VIIT f. 37. 



Marine: Cape Grood Hope (Atl.). 



Var. rcnitens A. S. (1875). — V. .strongly constricted. L. 0,or); B. 0,oi8 mm. Co-stse 10 in 

 0,01 mm. — Nav. vacill. v. renitens A. S. Atl. XII f. 55. 



Marine: Celebes (Atl.). 



Var. corsicana GtRUN. (1878). — V. slightly constricted. L. 0,og5; B. 0,022 mm. Costte 8, 

 alveoli 18 in 0,oi mm. — Cl. M. D. N:o 153. 



Marine: Corsica! Seychelles (Van Heurck Coll.)! Campeachy Bay! 



Var.? minnta GtRUN. (1880). — V. slightly constricted. Tj. 0,oi4 to 0,02; B. 0,oo4.-) mm. 

 Costae about 16 in 0,oi mm.. — Nav. vacillans f. minuta (N. Pfitseriana O. W.) V. H. Syn. 

 p. 90 PI. IX f. 9. 



Marine: Belgium (V. H.). 



61. D. Parma Cl. (1891). — V. broadly elliptical. L. 0,0.3; B. 0,02 mm. Central nodule 

 moderately large, rounded quadrate. Furrows arcuate, ecj^ually bent, approximate to the horns. 

 Costffi 14 in 0,01 mm. Alveoli 20 in 0,oi mm., forming longitudinal rows. — Cl. D. of Finland 

 p. 43 PI. II f. 10. 



Fresh water: Sweden, Lake Rosslangen i Kalmar Lan! Finland, Abo, Viando! 

 Similar to D. finnica but only half the size and with costffi and alveoli twice as close. 



62. D. flniiica Ehb. (1838) Cl. — V. broadly elliptical. L. 0,o5 to 0,05.5; B. 0,o34 to 0,0.3 6 

 mm. Central nodule small, elongated. Furrows broad, with arcuate exterior margins enclosing 

 a large, lanceolate space, about one third of the valve. Costfe 7 in 0,oi i^m. Alveoli 12 in 0,oi 

 mm. forming longitudinal or near the margin obliquely decussating rows. — Coccon. finnica Ehb. 

 Inf. p. 194. M. a. XVII, 2 f. 19. I), finnica Cl. D. of Finland p. 43 PI. IT f. 11. 



Fresh water: Sweden, Lake Roslangen! Degernas in Westerbotten, fossil! Finland! U. States 

 Albany, Maine, fossil! Crane Pond, fossil! Canada, fossil! 



63. D. microtatos Pant. (1886). — V. orbicular. L. and B. 0,034 to 0,o4 mm. Central 

 nodvile large, not sharply defined. Median line with distant central pores, and ending at a consi- 

 derable distance from the margin. Furrows broad; their outer margins enclosing an elliptical 



