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



Sea (Grun.), Saxony! Great Salt Lake! Oregon, fossil! Guatemala, fossil! Mexico, fossil! Argen- 

 tina, Rioja! Cameroon, Africa! 



Var. holmiensis Cl. (1881). — L. 0,o75 to 0,125; B. 0,02 to 0,o3 mm. Area wider. Strise 

 11 to 12 in 0,01 mm. Longitudinal lines faint or indistinct. — Nav. holm. Cl. N. R. D. p. 8 

 PI. II f. 18. N. formosa V. H. Syn. PL XI f. 2. 



Brackish water: Baltic, (Vaxholm, Abo)! 



Var. interrupta Cl. — L. 0,07; B. 0,oi3 mm. Axial area narrower. Central area a trans- 

 verse fascia. Strise 16 in 0,oi mm., parallel. Longitudinal lines median. 



Brackish water: Yarra, S. Australia! 



Var. quadrilineata Grun. (1879). — L. 0,044; B. 0,o9 mm. Area narrow, lanceolate. Striae 

 about 17 in 0,oi mm. Longitudinal lines double. — N. quadrilineata Grun. Cl. M. D. N:o 204. 



Brackish water: Oakland, Calif. (Grun.). 



32. C. (Alloioneis) cumnervia Grun. (1878). — V. lanceolate, slightly asymmetrical, with 

 obtuse ends. L. 0,068 to 0,115; B. 0,022 to 0,028 mm. Median line excentric, with arcuate 

 components. Axial and central areas uniting in a narrow and asymmetrical lanceolate space. 

 Strise 8 to 9 in 0,oi mm. slightly radiate. Longitudinal lines distinct, median. — Grun. in Cl. 

 W. Ind. D. p. 8 PL II f. 13. 



Brackish water: Elephant Point, India (Grun.) Island of Rhea near Singapore! 



33. C. amphisbsena Bory (1824). — V. elliptical, with capitate to rostrate ends. L. 0,o6 

 to 0,08; B. 0,0225 to 0,03 mm. Axial and central area uniting in a large rhombic-lanceolate 

 space. Strige 16 to 17 in 0,oi mm. radiate to the ends. Longitudinal lines median. — Navic. am- 

 phisb. Bory Encycl. meth. T. 2 (according to Ehrenb.). Frustulia depressa Kuxz. Dec. N:o 72 

 (1833) according to Lagerst. — Nav. amphishcena W. Sm. B. D. I PL XVII f. 147 a. (1853). 

 Grun. Verh. 1860 p. 534 PL IV f. 36. Donk. B. D. p. 36 PL V f. 13. V. H. Syn. p. 102 

 PL XI f 7. 



Fresh water: Sweden! England! Belgium (V. H.) Switzerland (Brun), Caspian Sea (Grun.). 



Var. fuscata Schum. (1867). — V. rectangular, with rosbrate ends. L. 0,04 to 0,045; B. 0,oi7 

 mm. Strise 16 in 0,oi mm. — Nav. fuscata Schum. Pr. D. U N. p. 57 PL II f. 43. Grun. A. D. 

 p. 31 PL I f. 27. 



Brackish water: Baltic (Schum.), Kara Sea (Grun.). Caspian Sea (Grun.). 



Var. subsalina Donk. (1873). — V. elliptical with rostrate-apiculate ends. L. 0,o7; B. 0,025 

 mm. Strise 17 in 0,oi mm. — Nav. subsalina Donk. B. D. p. 24 PL IV f. 2. Nav. amphisbcena 

 W. Sm. B. D. I PL XVII f. 147 (i. Nav. amph. v. subs. V. H. Syn. p. 102 PL XI f. 6. Dannf. 

 Bait. D. PL II f. 14. 



Brackish water: Greenland! Spitzbergen! Finmark! Bohuslan! north coasts of Britain (Donk), 

 Baltic! Saxony, Mansfelderseen ! Rostock, fossil! 



Forma major. — V. lanceolate, with gradually attenuated ends. L. 0,i; B. 0,o3 mm. 



V. H. Syn. PL XI f. 4. 



Brackish water: Belgium (V. H.). 



Var. Vuhotinovicii Pant. (1886). — V. lanceolate, subrostrate. L. 0,077 to 0,095; B. 0,029 to 



0,032 mm. Area large, lanceolate. Striae 12,5 to 15 in 0,oi mm., closer near the ends. Nav. 



Vuho. Pant. I p. 29 PL I f. 7, II p. 54, PL XII p. 220. 



Brackish water: Hungary, fossil! 



Var. liburnica Grun. (1860). — V. broadly lanceolate. L. 0,05 to 0,ii; B. 0,022 to O035 

 mm. Axial area narrow, slightly dilated in the middle. Strise 16 to 17 in 0,oi mm. Longitu- 

 dinal lines more approximate to the margin than to the median line. — Nav. lib. Grun. Verh. 

 1860 p. 547 PL III f. 25. 



Brackish: Adriatic (Grun.), Colon (Deby Coll.)! Calcutta (Deby Coll.)! 



