S7 



constrìction moderately deep, narrow, not opening widely outwards; 

 semi-cells with the base slightly reniform, and not increasing in width 

 upwards; densely covered with large granules, having a puncturn in 

 the centre of the space betwecn every three granules; the granules 

 are arranged in about thirteen perpendicular rows, of about eight in 

 a row, and leaving a small space at the base smooth: semi-cells 

 in side view nearly circular, and in end view ovai. Dim. 78 » 58 « 27 ■/. 



C. melanosponim Arch. p 38, T. I, f. 14. Small; length and 

 breadth equal; semi-cells transversely oblong; constriction modera- 

 tely deep, dose, opening out widely into the rounded sides; ends 

 broadly rounded; semi-cells from side view circular, from end view 

 ovai. Surface smooth, not punctate. Isthm. about one-third of the 

 breadt of the semi-cell. Zygosp. thick-walled, very dark brown, al- 

 most black, perfectly smooth and globular. Dim. i5-i7 « i5 -17 « 5 y.; 

 crass, 7-8 [j-.: Diam. of zygosp. 23-2 5 a. 



C. microsphiiictum Wittr, et Nordst v. inajìis n. v. p. 39, T. I, 

 f. 7. Dim. 80 « 52 - 35 'j.. 



C. odo7ilopleuruin Arch. in lit.: p. 40, T. II, f. i3: Small-sized; a 

 little longer than broad; sides nearly straight, but widening out 

 slightly and forming an obscure blunt tooth at each of the upper 

 angles; ends semicircular; constriction moderately deep and narrow; 

 surface smooth; zygosp. orbicular and smooth. Dim. 22 « 20 ** 8 a.; 

 Diam. of zygosp. 3o u. 



Scheint mir C. repandum Nordst. sehr nahe zu stehen. 



C. plicatum Reinsch v. Scoticum n, v p. 42, T. II, f 2, Sides 

 hoUowed; ends straight or slightly drawn out; celi walls very thick 

 and closely punctate. Dim. 57-07 « 38-40 >* 22-25 a. 



Ist nach West and West («Some recently pubi. Desm. » p. 3, in 

 Journ. of Bot. iSgS) identisch mit C. plicat. v. hibernicum West. 



C. Simii n. s. p. 45, T. II, f. 16. Fairly large sized, about one- 

 sixth longer than broad; sides nearly straight, ends semicircular, 

 constriction deep, and opening very widely; surface covered with 

 pearly granules arranged in perpendicular and concentric rows. Dim. 

 53-58 « 45-5o >* 20-22 a. 



Clodcrium juncidum Ralfs 7 eìongatuin n. v. p. 53. Much elonga- 

 ted, slender, not tapering, brown, strise distinct, few. Diam. 355- 

 400 « 1 1,2 [i. 



C. pseiidoclostehum Roy n. s. p. 55. Almost straight, very slen- 

 der, forty to sixty times as long as broad; breadth uniform ; ends 

 slightly rounded, with a small colourless space, but no vacuole prò- 



