A. CLEVE-EULER, DIAT. FLORA OF FINLAND. 43 



Achnanthes latissima n. sp. — PI. 4, f. 89. 



Frustule broadly elliptical, with subacute ends, 12 u. in 

 length, 9 [>. in breadth. Epitheca with 12 slightly radiate 

 striae, lower valve striate as the upper, but with a distinct 

 central nodule. Areas indistinct. 



Foss. : Ab. Hindersmossen, rare {fresh w.). 



Comes probably near to Achnanthes Hauckiana Grün. 



Achnanthes sp. — PI. 4, f. 90. 



Epitheca linear, with cuneate ends, 19 u. in length, 6,5 |J. 

 in breadth. Striae 14 in 10 [j., parallel, at the ends divergent, 

 apparently smooth. The two median ones are a trifle more 

 distant than the others on the one side of the valve. Hypo- 

 theca unknown. 



Foss.: Kk. Knjäsha, rare. 



Achnanthidium (Kütz.) Heib. 



Achnanthes lanceolata Bréb. var. capitata O. M. Bac. 

 Süd-Patag. Tab. 1, f. 6—7. 



Foss.: Ab. Hindersmossen; rare. 

 Distr. [fresh w.) Süd-Patagonien. 



Achnanthes lanceolata Bréb. var. crassa n. var. — Pl. 

 4, f. 91. 



Frustule genuflexed, elliptical, with abruptly protracted, 

 capitate ends. Length 11 — 12 |j., breadth 6 jj.. Epitheca 

 without axial area, with a horseshoe-formed marginal area on 

 one side of the valve, which side often is less inflated than 

 the opposite, sometimes subundulated side. Striae 13 — 14 in 

 10 a, radiate, not distinctly punctate. Hypotheca without 

 distinct areas, not fasciated. 



Foss.: Ab. Hindersmossen {fresh w.). 



This well defined small variety is closely allied to the 

 var. Haynaldii Saarsch (from Ecuador), by the capitate 

 ends and smooth striae, but scarcely half as long, by about 

 the same breadth. 



Achnanthes rhynchocephala n. sp. — PI. 4, f. 92. 

 Frustule broadly elliptical, with protracted, subcapitate 

 ends. Length 15 [j., breadth 7 a. Epitheca without axial 



