34 ERN'ST 0STRUP 



Valva sublineari, apicibus capitatis. Striis marginalibus, arearii 

 apicalem lalam relinquentibus. 



Hrafnagil (N.) H. Js., in a hot spring. Ulfsbaer (N.) B. P. 

 Area: Eur. 



Tliis form I consider identical with Hustedt's var. brevicostata. of 

 which no figure is given. 



Var. linearis Herib. Herib. Auv. Ill, 45, Tab. XIII, fig. 20. 



15 samples (S. 6, S.W. 5, N.I, E. 3). 

 Area: Ear. 



Pinnularia intermedia (Lgst.) Cl. Cl. Syn. II, 80. Lgst. Spb., Tab. I, 

 fig. 3 (Xav. int.). 



12 samples (S.W. 4, N. 4, E. 4). Hot spring: 1. 

 Area: Eur., Aust., Grl., B. E.. Spb., Fz. J. 



Pinnularia lata (Breb.) Cl. Cl. Syn. II, 81. Grim. Fz. J., Tab. I, fig. 14 

 (Xav. lata). 



32 samples (S. 10, S.W. 3, N.W. 4, N. 6, E. 8, s. I. 1). Hot springs: 4. 

 Area: Eur., As., Am.. Aust., Grl., J. M., Fz. J. 



Var. minor Grun. Cl. Syn. 1. c. Grun. 1. c., figs. 16 17 (Nav. lat. 

 min.). 



Hofsfjall :X.) O. D., Sey5isfjardarhcidi (E.) H.Js. 



Area : Gasp. Sea, J. M., Spb.. Fz. J. 



In a sample from Reykjavik (S.W.) H. Js. I have found a Pinn. lata 

 forma minima, of which I give a figure on tab. nostr. Ill fig. 51. Its dimen- 

 sions are: length 27 //, width 8 //. str. 4,5 in 10 //. 



Tabcllariecc Cl. 1895. Cl. Syn. II, 81. 



Pinnularia Brandeli Cl. var. linearis var. nova, Tab. nost. Ill, fig. 52. 



Long: 47 it, lat: 8 /./, str. 12 in 10 it. 



Valva linear!, apicibus rotundatis. Raphe area byalina satis 

 angusla, media in parle valva? in fasciam satis lalam dilatata, cincla. 

 Utroque in latere fascia? striola fere linearis adest. Fissuris termi- 

 nalibus semicircularibus. 



Torfastaflir (S.) A. F., in a hot spring. 



Undoubtedly a somewhat wider striated variant of Pinn. Brand. 



Pinnularia densestriata sp. nov., Tab. nost. Ill, fig. 53. 



Long: 50 //, lat: 6,4 //, str. 20 in 10 /<, 



Valva linear!, leniler undulala, apicibus roslralis. Raphe area 

 byalina lala, media in parte valvaj in fasciam latam dilatata, cincla. 

 Striis radiantibus, apices versus convergentibus. 



Hallormstartr (E.) B. P. 



I am not sure as to the place of this form within the several groups 

 of Pinnularia. Possibly, owing to the close striation, it ought to be 

 classed with Pinn. gracillimie, against which however speaks the broad 

 area and the transapical fasciae. 



