300 EUNOTIA. 



E. major (W. Sm.) Rabenh. {Himantidium IV. Sm., S.B.D., ii- 

 pi. 33, f. 286 ; H.V.H. Atl, pi. 34, f. 14*; Type No. 27 t), plate 9, fig. 366. 



Valve very elongate, arcuate, with parallel margins, apices very obtuse- 

 rounded, scarcely capitate ; striae with delicate puncta, almost confluent, about 

 12 in 1 c.d.m. ; connecting membrane showing striae formed of coarse puncta, 

 distant, about 14 in 1 c.d.m. Length, 9 to 19 c.d.m. 



Fresh water. Rare? Belgium, England (Norman), Scotland (Dickie, Balfour), Ireland (W. Sm., 

 O'Meara). 



var. bidens. (H.V.H. Atl., pi. 34, f. 15*), plate 9, fig. 367. 

 Dorsal margins showing two elevations. 



E. gracilis (Ehr.) Rab. (Ehr. Verb., p. 129, pi. II. 1, f. 9, and pi. 

 III. 1, f. 41 ; H.V.H. Atl., pi. ^t f. 1 and 2* ; Type No. 262), plate 9, 

 fig. 368. 



Valve arcuate, elongate, very narrow, with parallel margins, apices gently 

 capitate; striae delicate, 10 in 1 c.d.m., finely divided transversely. Connec- 

 tive membrane showing about 20 striae in 1 c.d.m., finely but distinctly 

 punctate. Length, 7 to 16 c.d.m. 



Fresh water. Cornimont (Delogne), Ard. Lieg. (De Wild.), England (H.V.H.), Scotland' 

 Ireland (O'Meara). 



E. exigua Breb. (in Kiitz. Spec. Alg., p 8 ; H.V.H. Atl., pi. 34, 

 f. ii* ; Type No. 270), plate 9, fig. 369. 



Valve arcuate, with apices truncate, more or less capitate, margins almost 

 parallel, striae very fine, about 24 in 1 c.d.m. Girdle face linear-narrow. 

 Length, 1 to 1-5 c.d.m. 



Fresh water. Paliseul. Noirfontaine (Del.), Ard. Lieg. (De Wild.), France (Breb,), Scotland. 



aa. Apices straight or directed towards the ventral margin. Individuals 



united into long filaments. 



E. pectinalis (Kutz.) Rabenh. {Himantidium Jntfs.,Bac.,pL 16, 

 f. 2 ; H.V.H. Atl., pi. ^2> f- ' 5 ar >d 16* ; Type No. 264), plate 9, fig. 370, 371. 



Valve very slightly arcuate, elongate, narrow, with parallel margins, apices 

 produced subrostrate, but not capitate; striae well marked, finely divided 

 transversely, about 8 in 1 c.d.m. at the median portion, much closer at the 

 apices. Connecting membrane with about 15 rather irregular striae in 1 c.d.m. 

 formed of puncta rather coarse, but faintly visible. Length, 3 to 15 c.d.m. 



Fresh water. Common. 



