ICONGL. SV. VKT. AKADEMIENS HANDLINGAR. BAND 26. N:0 2. U5 



are visible. Strise 8 to 9 in 0,oi mm. smootli, sliglitly radiate. — Na.v. hryoph. Cl. Vega p. 473 

 Pl. XXXVn f. 43. Var.? gelida Cl. 1. c. f. 42. 



Marine: Noi'tli Siberian Sea, Cape Wankareraa! Tce from the east-eoast of Grreenland! 



A very peculiar form, for which I can find no other natnral place tlian this. Tlie large 

 lateral areas give this form some resemblance to N. Hennedyi, but nevertlieless it cannot belong 

 to the sectioB Lyratse of Navicula, as the structure of the strise is entirely diiferent. If this 

 species really be a Caloneis, we have here the »lateral lines» in an extraordinary degree of 

 development. 



66. C. Miisca Greg. (1857). — V. broad, panduriform, with cuneate or i^ounded ends. L. 0,(i4 

 to 0,07; B. 0,016 to 0,0 2 5 mm. Axial and central areas nnited in a broad lanceolate, space, 

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

 distinet terminal fissnres and approximate central pores. Strite 7 to 8 in 0,oi mm., smooth, or 

 niore or less obscurely pnnctate. Longitndinal line broad, snbmargiiial. — Nav. Musca Greg. I), 

 of Clyde p. 479 Pl, IX f. 6. A. S. N. S. D. p. 86 Pl. I f. 15. Ath CLX f. 1, 2, 10, 11, 12. 

 Nar. constricta Grun. Verb. 1860 p. 535 Pl. III f. 18 (very bad). Nav. intercedens A. S. Atl. 

 CLX f. 3, 4, 5. Nav. muscceformis Pant. III Pl. XVII f. 256 (1893). 



Marine: North Sea! Mediterranean Sea! Adriatic! Bab el mandeb! Ceylon! Seychelles! 

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



Var. intermedia Cl. — Strongly constricted, with elliptical segments. L. 0,00 to 0,09; 

 B. 0,025 to 0,028 mm. Axial ai^ea narrow, lanceolate. Strite 6 in 0, 01 mm. Longitndinal lines 

 broad, submarginal. — Nav. Musca var. intermedia A. S. Atl. CLX f. 7, 8. 



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



Var. mirabilis Leud. Fortm. (1879). — V. panduriform with tongue-shaped segments. L. 0,077; 

 B. 0,029 mm. Axial area narrow linear, slightly dilated aroiind the central nodnle. Strite 7 (6 

 according to Leud.) in 0, 01 mm. Longitndinal lines broad, snbmarginal. — Nav. mirabilis Leud. 

 Fortm. D. de Ceylan p. 31 Pl. II f. 21. A. S. Atl. CLX f. 6. 



Marine: Ceylon! Sumbava (Kinker Coll.)! Manila (Deby CoU.)! Sumatra! 



Var. eurynota Cl. — V. strongly constricted in the middle with elliptical segments. L. 0,o8; 

 B. 0,02 (max.) to 0.o'i (min.) mm. Axial area very large. Striaj 6 in 0,oi mm. Longitndinal 

 line narrow, median. — Part II Pl. I f. 9. 



Marine: Rio Janeiro (Deby Coll.)! 



Var.? margim-punctata Grove a. Sturt (1887). — V. .slightly constricted in the middle, 

 ■with cuneate or rounded ends. L. 0,055 to 0,ii; B. 0,022 to 0,032 mm. Area broad and large. 

 Strite 10 in 0, 01 ram., becoming faint towards the area. Longitndinal lines marginal. — Nav. 

 margino-punctata Gr. a. Stort Journ.Quek. M. Club. III (2) p. 132 Pl. X f. 7. Nav. margino- 

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



Marine: Oamaru, New Zealand, fo.ssil! 



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

 pearance, but there exist, so far as I can find, no characteristics of snfficient importance for their 

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

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



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

 zingii. L. 0, 11 to 0,13; B. 0,04 (max.) to 0,oi8 (min.). Axial area broad, with rudimentary 

 continuations of the striai. Median line straight, enclosed between thick siliceous strings, with 

 small terminal nodules and approximate central pores. Strise 7 in 0, 01 mm., smooth, or indistinctly 

 gi'anulate, radiate. Longitndinal bands narrow, nearer to the margin than to the median line. — 



K. Sv. Vet. Akademieua Handlingar. Bd 26. N:o 2. 9 



