FRESH-WATER DIATOMS FROM ICELAND 21 



Var. nauiciilaceum W. Sm. Cl. Syn. I, 183. V. H. Trt. 1. c. fig. 309. 

 13 samples (S.W. 6, N. 3, E. 3, s. 1. 1). Hot spring: 1. 

 Area: Eur., Af., As., Aust. 



Gomphonema intricatum Ktz. Cl. Syn. I, 181. V. H. Trt., Tab. VII, 

 fig. 313. 



Höfdabrekka (S.) H. Js. 



Area: Eur., Af., As., Am., B. E. 



Var. dichotomum Ktz. Cl. Syn. 1, 182. V. H. Syn., Tab. XXIV, figs. 

 30—31. 



Reykjavik (S.W) H. Js., Stykkishölmur (S.W.) H. Js. 

 Area: Eur., Am., Aust. 



Var. Vibrio Ehr. Cl. Syn. 1. c. V. H. Syn. 1. c. figs. 26—27 (G.Vibrio). 

 Isafjord (N.W.) B. P. 

 Area: Eur., As. 



Gomphonema irreguläre sp. now, Tab. nost. II, fig. 27. 



Long: 60 jli, lat: 10 /i. 



Valva clavata, apice superiori subcapitata. Raphe area hyalina 

 satis lata, media in parte valvæ in fasciam unilateralem dilatata, 

 cincta. Striis punctatis, lenites radiantibus et irregulariter distribu- 

 tis, uno in latere superiori 6 in 10 u, altero in latere 9 in 10 /u, 

 apices versus densioribus. 



Vallanes (E.) B. P.). 



Gomphonema islandicum sp. nov., Tab. nost. II, fig. 28. 



Long: 46 jli, lat: 9 //, str. 11 in 10 jli, punctatis. 



Valva subclavata, margine undulata, apices versus attenuata. 

 Striis subradiantibus, apices versus in raphen perpendicularibus, in 

 apicibus deficientibus. Raphe area hyalina, media in parte valvæ 

 in fasciam latam dilatata, cincta, qua in fascia punctum unilaterale 

 solitarium et striæ paucæ abbreviatæque adsunt. 



Ingjaldshôll S.W.) H. Js. 



This form is possibly related to, but not identical with, the »Sporan- 

 gialform ' of Gomph. tergestinum Grun. given in A. S. Atl., Tab. CCXXX1V, 

 fig. 39, which H. Reichelt considers should be referred to G. semiaper- 

 tum Grun. 



Gomphonema Lagerheimi A. Cl. A. Cl. Lul. Lappm. 22, Tab. I, fig. 15. 



Ketilsta<Mr (S.W) H. Js. 

 Area: Eur. 



*Gomphonema lanceolalum Ehr. var. insigne Grun. Cl. Syn. I, 183. 

 V. H. Syn., Tab. XXIX, figs. 39—41. 



Krosså (S.) A. F.. Reykjavik S.W.) H. Js. 

 Area: Ubiquist. 



