EPITHEMIA. 295 



c.d.m. ; about 8 radiant rows of coarse elongated beads (each of which 

 consists really of two small beads close together) in the same space. Girdle 

 face more or less strongly inflated in the median portion. Length, 7 to 15 

 c.d.m. 



Fresh water. Very common everywhere. 



var. Westermanni Kiitz. ! (Baa, pi. 5, f. 12, &c. ; H.V.H. At!., 

 pi. 31, f. 8*), plate 9, fig. 347. 



Smaller and more squat with more convex dorsum, more inflated in 

 girdle view, apices not capitate. 



Brackish water. Antwerp. England (Comber, Norman). 



var. granulata. (E. granulata Kiitz.; H.V.H. Atl., pi. 31, f. 5 and 

 6*), plate 9, fig. 348. 



Much more elongate, scarcely arcuate, apices more inflated, costae in 

 girdle view almost parallel. Length, 13 to 15 c.d.m. 



Fresh water. Antwerp, rare? England, Scotland, Ireland (O'Meara). 



var. Vertagus. (E. Vertagus Kiitz.; H.V.H. Atl., pi. 31, f. 7*), 

 plate 9, fig. 349. 



Valve very elongated (attaining to 20 c.d.m.), median portion of the 

 dorsum sometimes bulging. 



Fresh water. Antwerp, Schaerbeeck (Delogne), England, France, Denmark. 



E. Hyndmanni W. Sm. (S.B.D., i., p. 12, pi. 1, f. 1 ; h.v.h. 



Atl., pi. 31, f. 3 and 4* ; Type No. 252), plate 9, fig. 350. 



Valve with dorsal and ventral margins strongly and regularly arcuate, 

 apices very obtuse ; 3 or 4 radiant costs, and six rows of coarse beads in 1 

 c.d.m. Girdle face strongly inflated at the central portion. Length, 16 to 

 20 c.d.m. 



Fresh water. Not yet found in Belgium. England (Norman), Scotland, Ireland (W. Sm.) 



It is thought that this may be a sporangial lorm of E. turgida. 

 aa. Beads very fine and approximate. 



E. Sorex Kiitz. (Baa, pi. 5, f. 12 ; h.v.h. Atl., pi. 32, f. 6-10*; 



Type No. 259), plate 9, fig. 351. 



Valve strongly arcuate, with margins regularly flexed, apices rostrate and 

 generally capitate; costae radiant, 6 or 7 in 1 c.d.m., striae radiant, finely 

 moniliform, 12 to 14 in 1 c.d.m. Girdle face strongly inflated at the 

 central portion. Length, 2^5 to 4 c.d.m Sporangial frustule, about 7 c.d.m. 



Fresh water. Very common everywhere, 



