80 BRITISH DIATOMACE^. 



6. Gomphonema tenellum, W. Sm. Stipes very short ; F.V. linear, 

 truncate ; V. lanceolate, extremities slightly produced ; striae 30 in 

 •001". Length -0006" to -0014". v.v. 



Gomp. rnicropus, Kiitz. Bacill. viii. 12. ad specim. quae dedit amic. De Bre- 

 bisson. In Conjugation, Thw. Ann. vol. xx. pi. xxii. fig. d. 



Fresh water. Wareham, Dorsetshire, Mar. 1848 ; near Lewes, Sept. 1850, 

 W. Sm. Near Bristol, Mr. Thwaites. Wray, near Lancaster, Mr. G. Smith. 

 Cantyre Peat. Marl, Co. Down. 



Plate XXIX. 243. 



7. Gomphonema capitatum, Ehr. Stipes quite distinct ; F.V. cu- 

 neate ; V. slightly attenuated towards the upper extremity, which 

 is rounded ; much attenuated towards the lower, which is somewhat 

 acute ; striae 27 in -001". Length -0009" to -0014". v.v. 



Ehr. Inf. xviii. 2. Kiitz. Bacill. xvi. 2. 

 Fresh water. Lewes, May 18.50, W.Sm. 

 Plate XVIII. 237. 



8. Gomphonema olivaceum, Ehr. Frustules and stipes forming 

 mucous masses ; F. V. distinctly cuneate ; V. slightly attenuated ; 

 upper extremity rounded, lower acute ; striae 28 in '001". Length 

 •0004" to -0018". v.v. 



Ehr. Inf. xviii. 9. Kiitz. Bacill. vii. 13, 15. ad specim. quae dedit amic. De 

 Brebisson. Echinella olivacea, Lyng. Tent. Ixx. c. 1, 2, 3. Gomp. 

 minutissimum, Grev. S. C. F. tab. ccxliv. 1. ex specim. quse communicavit 

 cl. Auctor. Gomp. Berkeleyi, Ralfs, Ann. vol. xii. pi. xviii. 8. Hass. 

 Alg. c. 2. 



Fresh water : in streams, frequent in winter and spring. River Froome, 

 Dorset, in vast quantities, Dec. 1849. River Ouse, Sussex, equally abundant, 

 Feb. 1852. Henfield, Sussex, Mr.Jenner. Duddingston Loch, Br. Greville, 

 Mar. 182G. 



Plate XXIX. 244. 



9. Gomphonema intricatum, Kiitz. F. V. almost Hnear, truncate ; 

 V. lanceolate, obtuse ; stria 30 in -001". Length ^0007" to -0021". 

 v.v. 



Kiitz. Bacill. ix. 4. 



Fresh water : forming a velvet-like stratum on the surface of a chalk cliflf. 

 Beachy Head, Sussex, Aug. 1850, TF. Stn. 



Plate XXIX. 241. 



