276 



MASTOGLOIA Thwaites 1848. Cl. Syn. II, p. 142. 



141. Mastogloia Smithii Thw. var. lacustris Grun., V. H. Syn. 

 tab. IV, fig. 14. 



Rare. Ejde (Stromo). 



Var. amphicephala Grun., V. H. 1. c, fig. 27. 



Ornefjæld, Trangisvaag, F'rodebo (Sj'dero); Sand (San do). 



142. M. elliptica Ag., A. S. Atl. tab. CLXXXV, fig. 19. 

 Ejde (Ostero). 



Var. punctata Cl. 



Rare. Thorshavn (Stromo). 



ACHNANTHEÆ Cl. Syn. II, p. 163. 



Rhoicosphenia Grun. 1860. Cl. Syn. II, p. 163. 



143. Rhoicosphenia curvata Kiitz., V. H. Syn. tab. XXVI, figs. 1—3. 

 Hesto; Nord reder. Plankton. 



Cocconeis Ehr.) Cl. Syn. II, p. 168. 



144. Cocconeis Pediculus Ehr., V.H. Syn. tab. XXX, figs. 28-30. 

 Here and there. 



A Cocconeis which appears in a gathcring from Kvanhaugen 

 (Sy der 6) mu.st, as far as I can see, be regarded as 



§a variety of C. Pediculus Ehr. As it, however, does not 

 quite agree with any of the figures which Cleve refers 

 to this species, I have given a figure of it in fig. 42 

 (•^"Vi'- L. 0,022 mm., B. 0,01 mm. Striæ 15—20 in 

 0,01 mm. On the hypothcca the striæ are only visible 

 Fig. 42. nt the margin. 



145. C. Scutellum Ehr., V. H. Syn. tab. XXIX, figs. 1—2. 

 Trangisvaag (Sy der 6). 



Eiicocconeis Cl. Syn. II, p. 172. 



146. Cocconeis flexella Kiitz., V. H. Syn. tab. XXVI, figs. 29-31. 

 Not rare. Plankton. 



In a gathering from Sand I found a form which excepting its size 

 corresponds exactly to Achnanthidinm maxiiniim A. Cl. (A. Cl. Lule Lapm. 

 fig. 23), and as in A. maximiim the pseudoraphe in almost rectilinear. 

 L. 0,046 mm., B. 0,015 mm. I only saw the epitheca. 



147. C. minuta Cl., Lgst. Spetsb. tab. II, fig. 16. 

 Here and there together with the above-mentioned. 

 Var. alpestris Br., Le Diatomiste II, tab. V, lig. 15. 

 Rare. Ornefjæld (Sydero); Thorshavn (Stromo). 



