FRESH-WATER DIATOMS FROM ICELAND 39 



*Amphora ovalis Ktz. Cl. Syn. II, 104. V. H. Trt., Tab. 1, fig, 15. 

 159 samples (S. 38, S.W. 37, N.W. 14, N. 22, E. 44, s. 1. 4). Hot 

 springs: 6. 



Area: Ubiquist, Grl., B. E., Spb. 



Var. Pediculus Ktz. CI. Syn. II, 105. V. H. Tit. 1. c. lig. 19. 

 41 samples (S. 14, S.W. 14 X. 5, E. 8). Hot springs: 3. 

 Area: Ubiquist, B. E., Fz. J. 



Amphora perpusilla Grun. Cl. Syn. II, 105. V. H. Tit., Tab. I, lig. 12. 

 Vik S. H.Js., Grimsey (X. O. I). 

 Area: Eur., Af., As. 



Subgenus Halamphora Cl. 1895. Cl. Syn. II, 117. 



*Amphora coffæiformis Ag. Cl. Syn. II, 120. V. H.Trt., Tab. I, fig. 6. 

 (i samples, all S. Hot spring: 1. 

 Area: Ubiquist, Grl. 



Amphora dubiosa sp. now, Tab. nost. IV, fig. 59. 



Long: 20 //, lat: «S /,. 



Valva semilaneeolala, apicibus valde capitatis. In parte apicali 

 valvæ striæ duæ raphoideæ adsunt. Strueturam ullain valvæ per- 

 spicere non potui. 



Spinstaôir i S.) A. F. 



Owing to the amphora-like shape and the two striæ, resembling 

 raphes, of this small form, I have classed it with Amphora. Possibly 

 it is closest related to A. Normani Rabh. 



Amphora Normani Rabh. Cl. Syn. II, 119. V. H. Tit., Tab. I, fig. 4. 

 Syôri Garöar (S.W.; H.Js. 

 Area: Kur.. Af., As., Am., Fz. J. 



Amphora protraeta Pant. var. galliça Hérib. Hérib. Auv. III, 61, 

 Tab. XIII, fig. 1. 



8 samples (S. 3, S.W.I. X. 1, E. 3). Hot springs: 2. 

 Area: Eur., Am. 



Amphora veneta Ktz. Cl. Syn. II, 118. A. S. All., Tab. XXVI, figs. 

 74—80. 



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



Mastogloia Thwaites 1848. Cl. Syn. II, 142. 



Mastogloia elliptica Ag. var. Dansei Thw. Cl. Syn. II, 152. V. H. 

 Trt., Tab. II, fig. 04 (M. Dansei). 



13 samples (S. W. 2, X.W.I, X. 4, E. 6). Hot springs: 5. 

 Area: Eur., Af., Am., Aust. 



