ENCYONEMA. 439 



2. SURIRELLA JeNNERI Ilass. 



Plate CII. Fig. 15. 



Char. Frustules in front view obtuse at each extremity, and 

 ivith sfricB in double series ; end view quadrangular, each 

 angle being prolonged into a thin plate. 

 Surirella hifrons Jenner, loc. cit. p. 204. 

 Ilab. Warbleton : Mr. Jenner. 



A very distinct and beautiful production, having no re- 

 lation with the N. bifrons of Ehrenberg. 



87. ENCYONEMA Kiitz. 

 Char. Frustules cymbiform, enclosed within a membrane. 

 Derivation. From s^kvos, full, and vqfjia, a thread. 



1. Encyonema prostratum Kiltz. 



Plate C. Fig. 10. 



Char. Frustules striated, straight, gibbous, small, enclosed 

 loithin a transparent membranous tube. 



Encyonema prostratum Kiitz., Die Kreselsclialigcn, &:c. 

 p. 82. t. 25. f. 7. Encyonema paradoxion Kiitz., Synops. 

 Diatom. Monema prostj-atum Berk., Glean, of Br. 

 Alga3. Schizone^na ? prostratum Grev., in Hook. Br. FL, 

 p. 414. ; Harv. in Manual, p. 214. Encyonema j^ros- 

 tratum Jenner, in Fl. of Tunbridge Wells, p. 206. 



Hob. On the boards of a sluice forming a thin, brown 

 mucous stratum : Rev. J. 31. Berkeley.. On the boards 

 of a sluice on Cheshunt JNIarshes : A. H. II. Bramble- 

 tye, near Forest Row, and in the stream which parts 

 Sussex and Kent, between Bodlam and Sandhurst. 



k very singular and beautiful production, coming near to 

 Schizonema. 



rr 4 



