52 Acta Societatis pro Fauna et Flora fennica, VIII, n. 2. 



resemblance to Diadesmis lucidula Grun. (V. H. XIV, 40) may 

 possibly be the lower valve of A. Galcar. 



PL III, fig. 8, (9 ?). 



Ab. 45, 47. 



A. Clevei Grun. var. bottnica CI. — Upper valve lanceolate 

 with coarse and coarsely punctate striae, 11 to 12 in 0,oi m. m. 

 (puncta 18 in 0,oi m. m.). Lower valve with a more or less 

 broad area around the raphe. Striae radiant, 17 in 0,oi m. m. 

 in the middle, . 25 on 0,oi m. m. at the ends, often alternately 

 longer and shorter in the middle. Length 0,oi7 to 0,0 3 2 m. m. 

 Breadth 0,0 5 to O.oi m. m. 



PL III, fig. 4, 5. 



Slightly brackish water in the Bay of Bothnia near Tornea 

 (83). 



A. dispar CI. n. sp. — Upper valve broadly lanceolate, with 

 rostrate ends, 0,0 2 3 m. m. in length and 0,0 9 m. m. in breadth, 

 covered with strong, parallel, not distinctly punctate, striae, 19 in 

 0,oi m. m. Lower valve with radiant striae, about 19 in 0,oi m. 

 m., reaching the raphe, except in the middle, where they are 

 shortened and alternately longer and shorter. 



PL III, fig. 2, 3. 



Slightly brackish water in the Bay of Bothnia near Tornea 



(83). 



44. 



A. danica Flogel. 



Sinf. (DannL). 



A. linearis (W. Sm.) Grun. — V. H. XXVII, 31, 32. 



Ab. 36, 46, 47, 48, Sb. 4, 6, 9, Sinb. Ob. 83, Lim. 23, 26. 



A. minutissima var. crypto cephala Grun. — V. H. XXVII, 41 



Ab. 47, 49, Sb. 1, 6, 19, Lim. 22, 23. 



A. marginulata Grun. — V. H. XXVII, 45, 46. 



Lim. 20, 22, 23, Lt. 32, 33. 



A. exigua Grun. — V. H. XXVII, 29, 30. 



Ab. 44, 47, 48. 



Achiianthidinm (Kutz.) Grun. 



A. flexellum Breb. — V. H. XXVI, 29, 31. 

 Al. 59, Kon. 42, Lt. 28, 34, Lim. 23, 24, 26. 



