424 DIATOMACE^. 



entangled. Frustules sfiort, triangular, ivith tivo con- 

 spicuous puncta at the end. Lateral surfaces obovate or 

 sub- clavate. 



/S Frustules scattered, more firmly attached to the stipes, 

 ichich is more evident. 



Grev. in Hook. Br. Fl. vol. ii. p. 409. ; Harv. Br. Alg. 

 p. 207. Gomph.? olivaceaYAiw, Die Infus. 218. t. 18. 

 f. 9. ; Pritch. Infus. p. 228. Exilaria minutissima 

 Berk., Br. Alg. p. 22. t. 7. f. 1. Miridion vernale Ag., 

 Consp. Diatom, p. 6dQ. f. 31. Gomph. geminatum 

 Klitz.j Alg. Aq. dulc. No. 13. Gomph. Leiblini Kiitz., 

 Synop. Diatom, p. 568. fig. 46. 



Hab. On stones, &c., in freshwater spring, King's Cliff, 

 Northamptonshire : Rev. M. J. Berkeley. Henfield, Sus- 

 sex : 3Ir. Borrer. Mayfield, Sussex : Mr. Jenner. Yar- 

 mouth : 3Ir. Dawson Turner. River Severn, near 

 Shrewsbury : Mr. Leighton. Cheshunt, Herts, and River 

 Lea : A. H. H. At the base of Bandon Mountains : 

 Mr. Andrews. — /3. Duddingston Loch : Dr. Greville. 



Tlie stipes in the species in its ordinary state, owing to its 



■^ being imbedded in a mucous matrix, is often with difficulty 



discernible. The frustules approach rather closely to those 



/ of Gomph. dichotomum; than which, however, they are shorter, 



broader, and more decidedly cuneate. 



7. GOMPHONEMA MINUTISSIMUM Ag. 



Plate C. Ficr. 3. 



Char. Frustules curved, striated ; terminal puncta ivell 

 marked. Lateral surfaces clavate, striated. 



Kiitz. Syn. Diatom, p. 567. fig. 43. ; Ehr. Die Infus. 

 p. 219. t. 18. fig. 5.; Pritch. Infus. p. 228. Gomph. 

 curvatum Kiitz., Syn. Diatom, p. 567. f. 51. ; Kiitz. 

 Aq. dulc. No. 76. 



Hab. Shrewsbury : Mr. Leighton. Shoreham, Kent : 



^.ji 



