FRESH-WATER DIATOMS FROM ICELAND 19 



in this direction. It is hardly identical with Cymb. amphioxys (Ktz.? 

 Grun.) CI. (see Le Diatomiste II, 145, Tab. IX, fig. 6 which however it 

 somewhat resembles. 



Cymbella marginata sp. nov., Tab. nost. II, fig. 24. 



Long: 46 //, lat: 7 //, str. 20 in 10 ,u. 



Valva elliptice-lanceolata. Raphe obliqua. Fissuris terminalibus 

 in eandem partem valvæ declinantibus. Striis marginalibus, paral- 

 lelis, aream apicalem latam circa raphen relinquentibus. 



Egilstafrr (S.), B. P. 



Cymbella microcephala Grun. Cl. Syn. I, 160. V. H. Trt., Tab. I, 

 fig. 34. 



8 samples (S. 2, S.W. 3. E. 3). Hot spring: 1. 

 Area: Eur., Am.. Grl. 



Cymbella naviculiformis Auersw. Cl. Syn. I, 166. V. H. Trt., Tab. I, 

 fig. 24 (C. cusp, navicl.). 



52 samples (S. 6, S.W. 19, N. 10, E. 16, s. 1. 1). Hot springs: 3. 

 Area: Eur., As., Am., Aust, Grl., B. E., Spb. 



*Cymbella parva W. Sm. Cl. Syn. I, 172. V. H.Trt., Tab. I, fig. 39 

 (C. cymbif. parva). 



200 samples (S. 40, S.W. 56, NW. 1, N. 22, E. 76, s. 1. 5 . Hot springs: 9. 

 Area: Eur., Af., As., Am., Grl., B. E., Fz. J. 



Cymbella prostrata Berk. Cl. Syn. I, 167. V. H. Tit., Tab. I, fig. 44 

 (Encyon. prost.). 



Krökur (S.) H. Js. 



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



Cymbella recta sp. nov., Tab. nost. II, fig. 25. 



Long: 105 a, lat: 18 «, str. 11 in 10 u, distincte punctatis. 



Valva lanceolata, apicibus rotundalis, raphe directa, media in 

 parte valvæ in aream satis latam dilatata, cincta. Striis parallelis. 



Thingvellir (S.W.). B. P. 



Cymbella sinuata Greg. CI. Syn. I, 170. V. H. Trt., Tab. XXV, fig. 

 699 (C. abnormis). 



10 samples (S.W 6. N. 2, E. 2). 



Area : Eur., Af., As., Austr., Grl., B. E. 



Cymbella stauroneiformis Lgst. Cl. Syn. I, 165. Lgst. Spb., Tab. I, 

 fig. L5. 



Ormastaftir E.) B. P. 

 Area: B. E., Spb. 



Cymbella subconstricta sp. nov., Tab. nost. II, fig. 26. 

 Long: 42 it, lat: 6 /<, str. 16 in 10 //, subtiliter punctatis. 

 Valva fere lineari, margine ventrali in medio leniter incurvata. 

 Striis radiantibus, in apicibus deficientibus, media in parte ventrali 



