KONGL. SV. VK'V. AKADEMIENfS HANDLINGAK. BAND. 27. \:i> 3. 29 



Var.? subimjjrcssu Grun. (!«?<()). — V. lanceolate. L. U,()(ir>; W. 0,0 u. iimi. Stria- II to 12 

 in 0,01 mm., crossed by a longitudinal line. — N. suhimpr. Ghun. A. D. p. 3i» PI. 11 f. 45. 



Marine: Sea of Kara (Grun.). 



Var.? tenuis Cl. (18H3). — V. elliptic-lanceolate, with a longitudinal impression on both 

 sides of the median line. L. 0,o38; B. 0,0 is mm. Stri;e 18 in 0,01 mm., unilaterally interiu]tted 

 by a narrow transverse fascia. — N. subimpressu car. tenuior Cl. Vega 1). p. 470 1*1 XXXVU f. 49. 



Marine: Cape DeschneflP! 



58. N. irregularis Pant. (1889). — V. narrow, lanceolate, with subacute ends. L. O.i^t;; 

 B. 0,021 mm. Axial area broad on one side of the median line, narrow on the other. Stria*, 7 

 to 10 in 0,01 mm. almost parallel, alternately longer and shorter, on one side of the median line 

 crossed by a linear lateral area. — Pant. II p. 49 PL XXX f. 424. 



Marine: Hungary, fossil (Pant.). 



I have not seen this species, but to judge from the figure it seems to be akin to N. transi- 

 tans var. asymmdrica. Somewhat similar is N. primordialis Pant. (Ill PI. XXV f. 882). 



59. N. (Khoicoiieis) sibirica Grun. (1882). — V. lanceolate, subacute. L. 0,o4 to 0,(10; 

 B. 0,01 mm. Axial area indistinct; central area large, subquadrate. StritB KJ (at the ends 10 to 

 11) in 0,01 mm. almost parallel throughout, distinctly lineate. Frustules arcuate, with narrow 

 connecting zone. — RJioiconeis Bulleana var.? sibirica Grun. in Cl. M. D. N:o 302. Cl. Vega 

 p. 469 PI. XXXVn f. 38. 



Marine: Cape Wankarema! 



Var. asymmetrica Cl. 1883. — Axial area unilateral, narrow. Stritc 11 in 0,oi mm. — 

 N. Bolleana v. asym. Cl. Vega p. 469 PI. XXXVII f. 39. 



Var. mediterranea Cl. — V. narrow, rhombic-lanceolate acute. L. 0, 1 ; B. 0,oi .i mm. Central 

 area rounded. Striie 7 in 0,oi mm., distinctly lineate; lineokt about 27 in 0,oi mm. 



Marine: Gulf of Naples! 



N. sibirica resembles N. Bolleana, but differs by its more parallel stritr and by the narrow 

 connecting zone. The X. Zoster.eti A. S. N. S. D. Ill f. 3 seems to belong to X sibirica. 



60. N. (Khoicoiieis) superba Cl. (1883). — V. rhomboidal with subacute ends. L. 0,u6; 

 B. 0,02 mm. Axial area unilateral, more or less narrow^. Central area small, somewhat trans- 

 verse. Stria; 8 to 10 in 0,oi mm., parallel, finely lineate, frequently crossed, on one side of the 

 median line by an irregular, narrow lateral area. - Vega p. 468 PI. XXXVI f. 23. 



Marine: Cape Wankarema! 



Var. ellijytica Cl. (1883). — V. elliptical. L. 0,06.5; B. 0,02 mm. Striae 10 in 0,oi mm. 

 Marine: Cape "Wankarema! 



The valves of this species seem to be somewhat dissimilar, the concave having more distant 

 stria*, frequently crossed unilaterally by a narrow area. 



61. N. (Rhoiconeis) obtusa Cl. (1882). — V. linear with broad, rounded ends. L. 0,o5.'i to 

 0,075; B. 0,0 14 to 0,0 18 mm. Axial area narrow, unilateral, irregular. Central area small. Strise 

 11 in 0,01 mm., slightly radiate in the middle, and convergent at the ends, frequently crossed 

 by irregular longitudinal, narrow bands. — Cl. a. M. D. N:o 315 to 318. Cl. Vega p. 469 

 PL XXXVI f. 25. 



Marine: Cape Wankarema! 



62. N. ammophila Grun. (1882). — V. linear-lanceolate, subacute. L. 0,oi7 to 0,03; B. 0,005 

 mm. Axial and central areas indistinct. Striie 10 to 11 in 0,oi mm., finely lineate, in the 

 middle subradiate, at the ends transverse (12 to 13 in 0,oi mm.). — F. D. Ost. Ung. p. 149 

 PL XXX f. 66 to 69. 



Marine and brackish: Coasts of England and Sweden (Grun.), Hungary, Tallya, fossil (Grun.). 



