444 MELOSIRA. 



beads are, in error, drawn separated ; they should touch one another). 

 Diameter, 6 to 10 c.d.m. 



In humid mosses, &c, rare? Alle (Delogne) Schooten near Antwerp (H. Van den Broeck), 

 England (W. Sin., Kitton, Arnott, Norman), Scotland (Greville), Ireland (Dickie, O'Meara). 



M. granulata (Ehr.) Ralfs. (in Pritch., p. 820; h.v.h. Atl., 



pi. 87, f. 10-12* ; Type No. 463), plate 19, fig. 621 (right-hand figures.). 



Valve disc with large granules, scattered, distant, slightly marked, margin 

 much indented. Frustules elongated, with valves marked with very coarse, 

 strongly marked granules, arranged in longitudinal lines, 7 to 9 in 1 c.d.m. 

 Diameter, "5 to 175 c.d.m. 



Freshwater. Brussels, Antwerp, rare? France, England. 



var. curvata Grun. (H.V.H. Atl., pi. 87, f. 18*), plate 19, fig. 622. 



Valves very long, filament very narrow, curved. 



Fresh water. Antwerp. Mixed with type-form. 



M. Dickiei (Thwaites) Kiitz. (Spec Aig., p. 889 ; Onhosha 



Dickiei Thw. ; H.V.H. Atl., pi. 90, f. 10, 12, 15 and 16* ; Type No. 469), 

 plate 19, fig. 623. 



Valves with fine granules only occupying the central portion. Frustules 

 short, with very fine puncta and a row of stronger puncta through the length 

 of the connecting zone. Typical frustules are often mixed with other 

 elongated, elipsoidal frustules, formed of several individuals incompletely par- 

 titioned, emboxed one in the other. Diameter, 1-25 to 175 c.d.m. Length of 

 typical frustules, 1*25 to 2-5 c.d.m. and of partitioned frustules up to 5 to 6 c.d.m. 



Fresh water. Very rare. ? Frahan (Delogne), Scotland (Dickie !), Ireland (O'Meara). 



II. Valve punctate and areolate : Paralia. 



M. Sulcata (Ehr.) KlltZ. (Baa, p. 55, pi. 2, f. 7 ; Orthosira 

 marina IV. Sm. ; Paralia sulcata Heib. ; H.V.H. Atl., pi. 91, f. 16*; in 

 Types Nos. 470, 490, etc.), plate 19, fig. 624. 



Valve disc bordered with a series of coarse beads, alternating with a series 

 of smaller and more or less visible beads, and of a broad circle of fine puncta 

 in quincunx. Central portion entirely hyaline (var. genuina Grim) or having 

 round the hyaline centre a series of fine radiant costse of greater or less 

 length (var. radiata Grun.). Frustule showing at the sutural margin a series 

 of large elongated alveoles, followed by smaller alternating alveoles. Diameter, 

 3 to 5 c.d.m. 



Marine. Rather rare. Blankenberghe, Antwerp (Scheldt) ; England ! (Brightwell, Kitton 

 Capron, Oliver, Stolt., Norman) ; Scotland (H.V.H., Type No. 101) ; Ireland (W. Sm., O'Meara). 

 Probably should be found on all the Coasts of the North Sea. 



