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



1. Smaller, marine or brackish forms, enclosed in gelatinous tubes (Berkeleya, Raphidogloea). ' 



1. A. rutilans Trbntbpohl (1806). — V. short and narrow, obtuse, linear-elliptical or linear- 

 lanceolate. L. 0,015 to 0,03.5; B. 0,oo4 to 0,oo6 mm. Forks about ^/j as long as the length of 

 the valve. Strise 28 in 0,oi mm., slightly radiate at the ends. — Conferva rutilans Trent, in 

 Roth Cat. Ill p. 179. Berkeleya Dillwijnii V. H. Syn. p. 113 PL XVI f. 15. ScUzonema Dillw. 

 W. Sm. B. D. II p. 77 PL LVIII f. 366. Berkel. obtusa V. H. Syn. L c. f. 16 and var. 

 adriatica f. 17, 18. 



Brackish and marine: Baltic (Gulf of Bothnia, at Tornea, Gotland, Bay of Finland)! Caspian 

 Sea (Grun.)! North Sea, English Channel! Mediterranean Sea! Japan! 



Var. antarctica (Harw.) Grun. 1881. — Striae 36 in 0,oi mm. — Berkel. antarct. Grun. in 

 V. H. Syn. PL XVI f. 20. Berk. Harveyana Grun. 1. c. 14. Berk, parasitica Grun. 1. c. f. 19. 

 Berk, finnica Dannf. Baltic D. PL 11 f. 19 (1882)? 



Marine: North Sea (Grun.), Falklands Islands (Grun.), Friendly Islands (Grun.). 



2. A. micans Lyngb. (1819). — V. linear, with broad and rounded ends, elongated. L. 0,o65 

 to 0,125; B. 0,0 1 mm. Forks more than Va of the length of the valve. Striae about 27 in 0,oi 

 mm. — Bangia micans Lyngb. Tentamen hydrophytol. p. 84 PL XXV. Berkeleya mic. Grun. in 

 V. H. Syn. p. 113 PL XVI f. 11. Berk, pumila V. H. Syn. 1. c. f. 13. Berk, adriatica Grun. in 

 T. R. M. S. 1877 p. 180 PL CXCV f. 15. 



Marine: North Sea! Mediterranean Sea (Grun.), Adriatic (Grun.). 



Var. fragilis (Grev.) Grun. — Striae 32 to 36 in 0,oi mm. — Berkel. fragilis Grev. Scot. 

 Crypt. Fl. PL 294. V. H. Syn. PL XVI f. 12. 



Marine: North Sea (Grun.), Mediterranean Sea (Grun.). 



2. Larger, brackish or freshwater forms, free or in mucous masses (Amphipleura). 



3. A. pcllucida Kutz. (1833). — V. fusiform, acute. L. 0,08 to 0,i4; 0,oo7 to 0,oo9 mm. 

 Forks 0,02 mm. Transverse strife 37 in 0,oi ram. — Frusiulia pelluc. Kutz. Linnea VIII PL 13 

 f. 11. Dec. N:o 83 (1834) accord, to Lagerst. A. pellucida Kutz. Bac. p. 103 (1844). W. Sm. 

 B. D. XV f. 127. Grun. Verb. 1862 p. 154. Grun. T. R. M. S. 1877 p. 179. V. H. Syn. p. 113 

 PL XVII f. 14, 15 A. 



Fresh and slightly brackish water: Baltic (Gotland, Dannf. Tornea!), Sweden (Malaren, 

 Vestergotland)! Finland! Belgium (V. H.), England (W. Sm.), Austria (Grnn.), Switzerland (Brun.), 

 Japan! 



Var. brasiliensis Cl. — L. 0,oo9; B. 0,oi mm. Forks 0,oi5 to 0,03 mm. Transverse strise 

 33, longitudinal 27 in 0,oi mm. — A. Lindheimeri Grun. in CL M, D. N:o 298. 



Fresh water: Brazil! Ecuador! 



Var. Lindheimeri Grun. (1862). — L. 0,i5 to 0,i6; B< 0,024 mm. Forks 0,o3 6 mm. Terminal 

 nodules short, rounded. Transverse striae 26, longitudinal 26 in 0,oi mm. — A. Lindheim. Grun. 

 Verb. 1862 p.' 155 PL XIII f. 11. T. R. M. S. 1877 p. 179 PL CXCV f. 13. 



Fresh water: Texas (Grun.), Costa Rica (Grove). 



Var. intermedia Grun. (1877). — L. 0,oi9 to 0,2; B. 0,di3 to 0,oi.5 mm. Forks 0,044 mm. 

 Terminal nodules short rounded. Strise somewhat finer than in var. Lindheimeri. — Grun. T. R. 

 M. S. 1877 p. 179. 



Fresh water: Oregon, fossil (Grun.). 



Var. oregonica Grun. (1877). — 0,33; B. 0,027 mm. Forks 0,063 mm. Terminal nodules 

 elongated, linear. Strise as in var. Lindheimeri. — Grun. 1. c. p. 179. 



Fresh water: Oregon, fossil (Grun.). 



See Gbitnows Monograph in Bot. Centralblatt 1880 N:o *'/« 



