KONGL. SV. VKT. AKADKMl KNS HANDLING Al{, HAND 26. N:0 2. 65 



are visible. Striae 8 to 9 in 0,oi mm. smootli, slightly radiate. — Nav. h-yopli. (JL. Vega p. 47H 

 PI. XXXVII f. 43. Var.? gelida Cl. 1. c f. 42. 



Marine: North Siberian Sea, Cape Wankarema! Ice from the east-coast of Greenland! 



A very pecnliar form, for which T can find no other natural place than this. The large 

 lateral areas give this form some resemblance to N. Ilcnncdi/i, but nevertheless it cannot belong 

 to the section Lyratse of Navicula, as the structure of the strire is entirely different. If this 

 species really be a Caloneis, we have liere the »lateral lines> in an extraordinary degi'ee of 

 development. 



()(). C. Miisca Gre«. (1857). — V. broad, panduriform. with cuneate or rounded ends. L. 0,04 

 to 0,07; B. 0,0 16 to 0,02 5 mm. Axial and central areas united in a broad lanceolate, space, 

 sometimes constricted in the middle. Median line bordered by thick siliceous strings, with in- 

 distinct terminal fissures and a])proximate central pores. Striic 7 to 8 in 0,01 mm., smooth, or 

 more or less obscurely punctate. Longitudinal line Itroad, submarginal. — Nav. Musca (tREG. D. 

 of Clyde p. 479 PI. IX f. C. A. S. N. S. D. p. 86 V\. I f. 15. Atl. CLX f 1, 2, 10, 11, 12. 

 Nar. constrida Grun. Verb. 18(50 p. 535 PI. Ill f. 18 (very bad). Nav. inierccdcns A. 8. Atl. 

 CLX f. 3, 4, 5. Nav. nmscceformis Pant. Ill PI. XVII f. 25() (1893). 



Marine: North Sea! Mediterranean Sea! Adriatic! Bab el mandel)! f'eylon! Seychelles! 

 China! Japan! Galapagos Islands! Porto Seguro! West Indies! 



Var. iiitcrnicdia Cl. — Strongly constricted, with elliptical segments. L. 0,o(; to 0,09; 

 B. 0,02.") to 0,02 8 mm. Axial area narrow, lanceolate. Striee G in 0,oi mm. Longitudinal lines 

 broad, submarginal. — Nac. Mu.sca var. intermedia A. S. Atl. CLX f. 7, 8. 



Marine: Sumbava (Kinker Coll.)! Manila (Deby Coll.)! Samoa (Atl.). 



Var. niirahilis Leud. Forth. (1879). — V. panduriform with tongue-shaped segments. L. 0,0;-; 

 B. 0,029 mm. Axial area narrow linear, slightly dilated around the central nodule. Stride 7 ((> 

 according to Leud.) in 0,oi mm. Longitudinal lines broad, submarginal. — Neiv. mirabilis Leud. 

 FoRTM. D. de Ceylan p. 31 PI. II f. 21. A. S. Atl. CLX f. (5. 



Marine: Ce3'lon! Sumbava (Kinker Coll.)! Manila (Deby Coll.)! Sumati-a! 



Var. eurynota Cl. — V. strongly constricted in the middle with elliptical segments. L. 0,08; 

 B. 0,02 (max.) to O.oi (min.) mm. Axial area very large. Striae 6 in 0,oi mm. Longitudinal 

 Hue narrow, median. — Part II PI. I f. 9. 



Marine: Rio Janeii-o (Deby Coll.)! 



Var.? margino-punetata Grove a. Sturt (1887). V. slightly constricted in the middle, 



with ci;neate or rounded ends. L. 0,o.').') to 0,ii; B. 0,022 to 0,032 mm. Area broad and large. 

 Stritti 10 in 0,oi mm., becoming faint towards the area. Longitudinal lines marginal. — N(tr. 

 marfjiHO-punctata Gr. a. Stdrt Journ.Quek. M. Club. Ill (2) p. 132 PI. X f. 7. Nav. niargino- 

 liiienfa Gr. a. Sturt. 1. c. f. 11. A. S. Atl. CLX f. 27. 



Marine: Oamaru, New Zealand, fossil! 



N. Musca is extremely variable and many of the varieties are very dissimilar in ap- 

 ]iearance, but there exist, so far as I can find, no characteristics of sufficient importance for their 

 distinction as species. Nearly akin to N. Musca is also the following, which is described as a 

 species, because it occurs in many different places with the same characteristics. 



(17. C. Kinkeriana Truan (1892). — V. panduriform, of the same outline as Diploneis Kiil- 

 zingii. L. 0,n to O,].'?; B. 0,04 (max.) to 0,oi8 (min.). Axial area broad, with rudimentary 

 continuations of the strife. Median line straight, enclosed between thick siliceous strings, \\\i\\ 

 small terminal nodules and approximate central pores. Strife 7 inO,oi mm., smooth, or indistinctly 

 granulate, radiate. Longitudinal bands narrow, nearer to the margin than to the median line. — 



K. Sv. Vet Akadomlena Handlinfjar. Bd 'iO. N:o 2. 9 



