126 p. T. CLEVE, SYNOPSIS OF THE NAVICULOIl) DIATOMS. 



1. Smaller, marine or hraclcish forms, enclosed in gelutinons tubes (Berkeleya, Raphidogloea). ' 



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

 lanceolate. L. 0,0 15 to 0,o3.t; B. 0,004 to 0,006 mm. Forks abont ' ., as long as the length of 

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

 Roth Cat. Ill p. 179. Berkeleya Dillwynii V. H. 8yn. p. 113 PI. XVI f. 15. Sehizonema Dillw. 

 W. Sm. B. D. II p. 77 PI. LVIII f. 866. Berkel. ohtusa V. H. Syn. 1. c. f. 1(5 and var. 

 adriatica f. 17, 18. 



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

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



Var. anfarctica (Harw.) Grun. 1881. — Striie 36 in 0,oi mm. — Berkel. anfarcf. Grun. in 

 V. H. Syn. PI. XVI f. 20. Berk. Harveyanu Grun. 1. c. 14. Berk, parasiiica (iJrun. 1. c. f. 19. 

 Berk, finnica Dannf. Baltic D. PI. II f. 19 (1882)? 



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



2. A. inicaus Lyn(jb. (1819). — V. linear, with broad and rounded ends, elongated. L. 0,o6 5 

 to 0,12.5; B. 0,01 mm. Forks more than ' ^ of the length of the valve. Strife about 27 in 0,oi 

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

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

 T. R. M. S. 1877 p. 180 PI. 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. PI. XVI f. 12. 



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



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



3. A. pellucida Kutz. (1833). — V. fu.siform, acute. L. 0,o8 to 0, u; 0,oo7 to 0,oo9 mm. 

 Forks 0,02 mm. Transverse stria? 37 in O.oi mm. — Frustulia pelluc. KiiTZ. Linnea VIII PI. 13 

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

 B. D. XV f. 127. Grun. Verh. 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 (Grun.), Switzerland (Brun.), 

 Japan ! 



Var. brasiliotsis Cl. — L. O.oo'j; B. 0,oi mm. Forks 0,oi5 to O.o.i mm. Transverse striee 

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



Fresh water: Brazil! Ecuador! 



Var. Lindheinieri Grun. (1862). — L. 0,i5 to 0,1 e; B. 0,024 mm. Forks 0, 03 1; mm. Terminal 

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

 Verh. 1862 p. 155 PL XIII f. 11. T. R. M. S. 1877 p. 179 PL CXCV f 13. 



Fre.sh water: Texas (Grun.), Costa Rica (Grove). 



Var. intermedia Grun. (1877). — L. 0,oi'j to 0,2; B. 0,(113 to 0,015 mm. Forks 0,o44 mm. 

 Terminal nodules short rounded. Strife somewhat finer than in var. Lindheiraeri. — Grun. T. R. 

 M. S. 1877 iJ. 179. 



Fresh water: Oregon, fossil (Grun.). 



Var. oregonica Grun. (1877). — 0,33; B. 0,027 mm. Forks 0,ofi3 mm. Terminal nodules 

 elongated, linear. Strife as in var. Lindheinieri. — Grun. 1. c. p. 179. 



Fresh water: Oregon, fossil (Grun.). 



' See Grunows Monograpli in Hot. Central blatt 18«0 N:o "'/ift- 



