502 Transactions of the Society. 
5. T. regulare Kiitz. {Poly edrium tetraedricum Nag.). III. Mp., 
Pu., Th. 
6. T. enorme (Ralfs) Hansg. I. Ep. III. Fg. YI. N. 
7. T. horridum sp. n. (PL VII. figs. 4, 5.) 
T. magnum, irregulariter tetragonum, pentagonum, hexa- 
gonum, vel suboblongatum, compressum, angulis acutis vel 
rotundatis (rare submamillatis) ; membrana firma, ad angnlos 
incrassata et spinis validis rectis curvatisque (nonnunquam 
bi- vel trifurcatis) singulis vel geminatis vel pluribus prseditis, 
etiam spinis brevibus paucis inter angulos dispositis ; a latere 
visum ellipticum vel oblongum. 
Diam. s. spin. 27-42 /z, c. spin. 33-61 /z; crass. 19- 
21 /z. I. Ep. III. Pt. 
This species differs from T irregulare (Eeinsch) De Toni in being 
more irregular, in not having the angles produced, and in the irregular 
nature and disposition of the spines. 
Sub-fam. Characie^:. 
Genus Gharacium A. Br. 
*1.0. Ndgelii A. Br. II. Wh. 
*2. C , Pringslieimii A. Br. III. B., M. VIII. G. 
3. G. Siebaldii A. Br. YI. N. 
4. G. heteromorphum (Eeinsch) (Hydrianum heteromorphum 
Reinsch). Common. 
5. G. ornithocephalum A. Br. III. Fg. 
*6. G. longipes Eabenh. II. U. 
Sub-fam. Tetraspore^:. 
Genus Schizochlamys A. Br. 
1. S. gelatinosa A. Br. I. Ep. III. C. 
2. S. delicatula West. III. Bi., Ew., Mp. YII. D. 
Genus Palmodactylon Nag. 
1. P. siibramosum Nag. I. Ep. II L Evv. Y. Go. 
2. P. varium Nag. II. Ha. 
Genus Apiocystis Nag. 
1. A. Brauniana Nag. II. Ha. III. Ew., M., Wt. YII. S. 
Genus Tetraspora Link. 
1. T. gelatinosa (Yauch.) Desv. III. B., Ew. 
2. T. lubrica (Roth) Ag. IY. Ks. VIII. near Bodmin. 
Genus Palmella Lyngb. 
1. P. mucosa Kiitz. II. Wh. III. E. 
2. P. hyalin a Breb. IY. Ks. 
