8 ERNST ØSTRUP 



Neidium fasciatum Øst. Øst. D. D. 21, Tab. 1, flg. 14. 

 Gautavik (E.) H. Js., Vallanes (E.) H. Js. 

 Area: Eur. 



Neidium Hitchcockii (Ehr.) Cl. Cl. Syn. 1, 69. A. S. Atl., Tab. XLIX, 

 flg. 35 & 36 (Nav. Hitch.). 

 Vallanes (E.) H. Js. 

 Area: Eur., As., Am., Aust. 



Neidium incurvum (Greg.) Øst. Tab. nost. I, fig. 5, cnfr. Greg. Mic. 

 J IV, 8, Tab. I, fig. 26 (Nav. inc.). 



Long: 45 //, lat: 10 & 11 //. 



Valva elongata, in medio leniter incurvata, apicibus capitatis. 

 Nodulis terminalibus summis in apicibus positis. Raphe area hyalina 

 angustissima, media in parte valvæ in areolam parvam dilatata, 

 cincta. Structura m ullam valvæ perspicere non potui. 



Grimså (E.) B. P. 



Area: Eur. 



I consider this form identical with Gregory's Navicula incurva. The 

 "fragliche" form delineated in A. S. Atl., Tab. XLIA', fig. 13, from Loch 

 Davin, Scotl., must surely be referred to this. 



*Neidium Iridis (Ehr.) Cl. Cl. Syn. I, 69. V. H. Tit., Tab. V, fig. 

 212 (Nav. Ir). 



5 samples (S.W. 3, E. 2). 

 Ubiquist, Grl., Fz. J. 



Neidium islandicum sp. now, Tab. nost. I, fig. 6. 



Long: 30 //, lat: 7 /<. 



Valva elliptice-lanceolata, apicibus rotundatis. Raphe area hyalina 

 angusta, mediam partem valvæ versus patescente ibique in fasciam 

 latam dilatata, cincta. Lineis inframarginalibus distinctis. Striis ægre 

 perspiciendis. 



Brunavikurstrand (E.) H. Js. 



Neidium lineare sp. now, Tab. nost. I, fig. 7. 



Long: 41 jn, lat: 6,4 //. 



Valva lineari, apicibus rotundatis. Raphe area hyalina angusta, 

 media in parte valvæ in fasciam satis latam dilatata. Lineis infra- 

 marginalibus distinctis. 



Vallanes (E.) B. P. 



This small form is possibly related to, but not identical with Neid, 

 bisulcatum. 



Neidium panduriforme sp. now, Tab. nost. I, fig. 8. 



Long: 22 //, lat: 8 & 9,5 ft. 



Valva panduriformi, linea inframarginali instructa. Raphe media 



