66 p. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



Cl. in Diatomiste I p. 76 PI. XII f. 5. Nav. Kink. Pant. Ill PI. XLII f. 571. Nav. Venus Pant. 

 Ill PI. XXIX f. 422 (1892)? 



Marine: Guernsey (Grove Coll.)! Mediterranean Sea (Naples, Nice, Barcelona)! Moron, 

 fossil (Truan). 



This is certainly one of the most beautiful naviculoid diatoms. It was named by the late 

 Mr. Truan Nav. Kinkcriana, a name given by Pantocsek to another Navicula (N. Kinherii II, IX 

 f. 169). For this reason I proposed to name it N. amoena, but having since separated the genus 

 Caloneis from Navicula, I prefer the name given by Truan. 



68. C. biconstricta Grove a. Sturt (1887). — V. biconstricted v?ith orbicular median and 

 elliptical terminal segments. L. 0,08; B. 0,oi6 mm. Axial area narrow; central area orbicular. 

 Strise 8 in 0,oi mm. Longitudinal line marginal. — Nav. hie. Grove a. Sturt. Quek. M. Club. 

 Ill (2) p. 132 PL X f. 9. 



Marine: Oamaru, New Zealand, fossil! 



69. C. formicina Grun. (1878). — V. biconstricted, with small median and large terminal 

 segments. L. 0,057 to 0,085; B. 0,oi2 (max.) to 0,oo4 (min.) mm. Axial area narrow, dilated in 

 the middle to a transverse fascia. Strise 6 in 0,oi mm., very delicately punctate. Longitudinal 

 line inframarginal. Frustule rectangular. — Nav. formicina Grun. in Cl. West Ind. D. p. 6, 

 f. 6. A. S. Atl. CLX f. 38 to 41. 



Marine: Campeachy Bay (Grun.). 



70. C? egena A. S. (1890). — V. biconstricted, with the median segment smaller than the 

 terminal, which are acuminate. L. 0,033; B. 0,oo5 mm. Axial and central areas united in a 

 space of the same shape as the valve. Strise marginal, 11 in 0,oi mm. Longitudinal line? — 

 Nav. egena A. S. Atl. CLX f 42, 43. 



Marine: Campeachy Bay (A. S.). 



71. C. ophiocephala Cl. a. Grove (1891). — V. very convex, divided by two constrictions 

 into three segments, of which the median is almost orbicular, the terminal spathulate. L. 0,o7 to 

 0,08 5; B. 0,013. Median line with indistinct terminal nodoles, enclosed between strong siliceous 

 strings. Axial areas in the terminal segments large, lanceolate. Central area very broad, having 

 a lunate marking or each side of the central nodule. Strise 11 in 0,oi mm, at the base of the 

 segments, 13 at the ends, radiate, smooth. Longitudinal line narrow. — Nav. ophiocephala Cl. a. 

 Grove Diatomiste I p. 57 PL IX f. 13. 



Marine: Island of Rhea, Singapore! Java! Island of Muntok, Sumatra! Macassar Straits 

 (Grove Coll.)! 



72. C? sclntillaiis Temp. a. Brun. (1889). — V. strongly constricted in the middle. Seg- 

 ments rhomboidal with cuneate ends. L. 0,o9 to 0,i25; B. 0,025 to 0,035; at the constriction 0,o 12 

 mm. Median line enclosed between strong siliceous strings with small terminal fissures, turned 

 in the same direction, and approximate central pores. Axial area narrow. Central area a broad 

 transverse fascia. Strise 6 in 0,oi mm. smooth, slightly divergent in the middle of each segment. 

 Longitudinal line(?) approximate to the axial area, indistinct. — Nav. scint. D. f du Japon p 45 

 PL V f. 5. A. S. Atl. CLX f. 36, 37. 



Marine: Japan, fossil! Jedo (Atl.). 



I am not quite sure whether this form belongs to Caloneis or to Pinnularia. On the fig. 

 in D. f. du Japon a marginal longitudinal line is visible, but I have not seen this line on original 

 specimens. It seems to me doubtful whether the line close to the axial area is the longitudinal 



