FRESH-WATER DIATOMS FROM ICELAND 21 



Var. naviciilaceum W. Sm. Cl. Syn. I, 183. V. H. Trt. 1. c. fig. 809. 

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

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



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

 fig. 313. 



Hofdabrekka (S.) H. Js. 



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



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

 3031. 



Reykjavik (S.W; H. Js., Stykkisholmur (S.W.) H. Js. 

 Area: Eur., Am., Aust. 



Var. Vibrio Ehr. Cl. Syn. 1. c. V. H. Syn. 1. c. figs. 2627 (G. Vibrio). 



Isafjord (N.W.) B. P. 

 Area: Eur., As. 



Gomphonema irregulare sp. nov., Tab. nost. II, fig. 27. 



Long: 60 ,, lat: 10 ft. 



Valva clavata, apice superior! subcapitata. Raphe area hyalina 

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

 cincta. Striis punctatis, lenites radiantibus et irregulariter distribu- 

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

 apices versus densioribus. 



Vallanes (E.) B. P.). 



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



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



Valva subclavata, margine undulata, apices versus attenuata. 

 Striis subradiantibus, apices versus in raphen perpendicularibus, in 

 apicibus deficientibus. Raphe area hyalina, media in parte valvae 

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

 solitarium et striae paucae abbreviataeque adsunt. 



Ingjaldsholl (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. 



Ketilstadir (S.\V) H. Js. 

 Area: Eur. 



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

 V. H. Syn., Tab. XXIX, figs. 3941. 



Krossa (S.) A. F., Reykjavik (S.W.) H. Js. 

 Area: Ubiquist. 



