188 P. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



P. XXIX f. 244. v. H. Syn. p. 126 Pl. XXV f. 20 to 27. G. sphcenelloides ScncM. Pr. D. I 

 Nachtr. p. 19 f. 16. G. suhramosum Kutz. (fide Grun.). Sj)heudln vulgaris KtJTZ. (fide Grun.). 



Fresh and brackish water: Sweden! Germany! Switzerland! England! 



Var. haltica Cl. (1S68). — V. clavate. L. 0,04; B. 0,uo75 mm. Central area small. Strise 

 16 to 17 in 0,01 mm. — G. halticum Cl. Sv. och Norsk D. p. 231 Pl. IV f. 10 to 16. 



Brackish water: Baltic (from Westerbotten to Gothland)! 



Var. calcarea Cl. (1868). — V. clavate; L. 0,022 to 0,047; B. 0,oo.'5 to O.oos mm. Central 

 area small. Strise 12 to 13 in 0,oi mm. — G. calcareum Cl. Sv. och Norsk D. p. 231 Pl. IV f. 7. 



Fresh water (on moist limestone-rocks): Gothland! 



Var. stauroneifornm Grun. (1878). — V. lanceolate. L. 0,0.33 to 0.07; B. 0,oi to 0,012 mm. 

 Striaj 10 to 13 in 0,oi mm. — Grun. Casp. See Alg. p. 9 Pl. Ill f. 2. 

 .^ Brackish water: Caspian Sea (Grun.). 



Var. tenelluni Kutz. (1844). — V. small, clavate. L. 0,012 to 0,025; B. 0,oo.3 to 0,00.3 .i mm. 

 Striee 14 in 0,oi mm. — G. ten. Kutz. Bac. p. 84 Pl. VIII f. 8. V. H. Syn. Pl. XXIV f. 22 to 2.i. 



Fresh water: Finland, Abo! Australian Alps! 



G. olivaceum lives iisnaUy in rivulets by slender stalks attached to stones and forming 

 brownish masses aboiit 1 centim. in diameter. The var. calcarea was found on limestone-rocks on 

 Gothland, fixed by long stalks and forming thick gelatinous masses. The var. baltica is common 

 in the Baltic and the Gulf of Bothnia, where it occnrs attached by elongated gelatinous stalks to 

 Zostera and Potamogeton. The G. tenelluni is not quite clear to me. What I suppose to be 

 KuTziNGs species is doubtless a very small G. olivaceum, but in the Sjni. of Van Heurck Grunow 

 places G. tendlum among the asymmetrical Gomphonemas, so it is possible that G. tenellum Kutz. 

 Is a small G. intricatiim. 



23. G. Åestuarii Cl. (1893). — V. linear, narrow, slightly clavate, Tvith obtuse end and 

 basis. L. 0,o2 to 0,02^; B. 0, 002 to 0,oo3.5 mm. Axial area indistinct; central area a broad trans- 

 verse fascia. Strise parallel (the median radiate) 20 in 0,oi mm. Ends of the val ve with rndi- 

 mentary diapliragms. — Cl. Diatomiste Vol. II p. 55 Pl. III f. 4. 



Marine: Hastings (Comber Coll.)! 



24. G. exigimm Kutz. (1844). — V. narrow, clavate with obtuse, sometimes slightly rostrate 

 apex. L. 0,009 to 0,03; B. 0, 002 to 0, 003 mm. Axial area narrow, not dilated in the middle. 

 Striaj 18 in 0,oi mm. transverse. — Kutz. Bac. p. 84 Pl. XXX f. 58. V. H. Syn. p. 126 Pl. XXV 

 f. 34. G. hyalinum Heib. Consp. D. D. p. 96 Pl. V f. 18 (1863). G. exiguum var. digitatum V. H. 

 Syn. f. 35, 36;! var. teloyraphicmn (KtJTZ.) V. H. 1. c. f. 37; var minutissmium (KtJTZ.) V. H. 1. c. 

 f. 38; var. perpusilla Grun. V. H. 1. f. 39. 



Marine: Coasts of Denmark (Heib.), England! Belgium (V. H.). 



This minute species is probably widely distributed, biit from its smallness rarely met with in 

 cleaned materials. Between the many varieties in V. H. Syn. I am unable to lind a.\\y ditfereuce 

 except ill the number of the stria?, and the size. 



Var. pachijclada Bréb. (1838). — V. linear-clavate. L. 0,oi5 to 0,034; B. 0,oo.5 mm. Strise 

 16 in 0,01 mm. — G. pach. Bréb. Considér. p. 21 (fide Chase). V. H. Syn. XXV f. 31, 32. 



Marine: Coasts of Normandy (Bréb., Grun.), Cape Wan kårerna! Behrings Island! 



Var. arctica Grun. (1880). — V. broad, clavate. L. 0,02 to 0,035; B. 0,oo6 to 0,oo8 mm. 

 Striffi 16 to 20 in 0,oi mm. almost transverse. — G. aret. Grun. V. H. Syn. Pl. XXV f. 30. 

 Franz Josephs Land D. p. 102 (50) Pl. I f. 13. 



Marine, arctic regions: Franz Josephs Land (Grun.), Nova Zembla! Cape Wankarema! 



25. G. kamtscliaticum Grun. (1878). — V. elongated, clavate, with rounded apex and nar- 

 rower basis. L. 0,o3 to 0,07; B. 0,oo5 to 0,oii mm. Axial area distinct, linear, dilated around 

 the central nodule. Strice 12 to 16 in 0,oi mm. radiate in the middle, very finely punctate. — 



