MERIDION. 417 



Jenner, loc. cit. p. 292. ; Ralfs, in Annals, vol. xv. 

 p. 460. pi. xiv. fig. 2. ; Bailey Amer. Bacil. pi. ii. f. 29. 



Hab. Piltdown Common : Mr. Jenner. 



The teeth or processes in this species are obtuse and but 

 little elevated. % 



3. EUNOTIA TRIODON Ehr. 



Plate XCYII. Fig. 7. 



Char. Frustules in lateral view semi-lunar, having three 

 obtuse teeth on the convex margin. 



Eunotia Triodon Bericht. der Akademie d. Wissensch. zu 

 Berlin, 1837, p. 45.; Die Infus. t. xxi. fig. 24.; Jen- 

 ner, in Fl. of Tunbridge Wells, p. 202. ; Ralfs, in 

 Annals, vol. xv. p. 461. pi. xiv. fig. 23 ?; Bailey, Amer. 

 Bacil. pi. ii. f. 30. 



Hab. Cold bath spring : Mr. Jenner. 



A distinct species, noticed hitherto, I believe, only by Mr. 

 Jenner. 



4. EUNOTIA TETRAODON Ehr. 

 Plate XCVII. Fig. 8. 



Char. Frustules in lateral view semilunar, with four obtuse 

 teeth on the convex margin. 



Eunotia Tetraodon Mittheilungen der Berl. Naturforsch. 

 Freunde (Berl. Staatszeitung, April 1837); Die Infus. 

 p. 192. t. xxi. fig. 25. ; Ralfs, in Annals, vol. xv. p. 461. 

 pi. xiv. fig. 4. ; Bailey, 1. c., pi. ii. f. 31. 



Hab. Piltdown Common, Sussex, and Weston Bogs near 

 Southampton : Mr. Jenner. 



B. Frustules wedge-shaped. 

 74. MERIDION Leiblein. 



Char. Frustules cuneate, united so as to form segments of 

 circles or spirals. 



E E 



