424 DIATOMACE^. 



entangled. Frustules short, triangular, loith two con- 

 spicuous puncta at the end. Lateral surfaces ohovate or 

 suh-clavate. 



/3 Frustules scattered, more firmly attached to the stipes, 

 ivhich is more evident. 



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

 13.207. Gomph.9 olivaceaYXxw, Die Infus. 218. t. 18. 

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

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

 Consp. Diatom, p. 55Q. £31. Gomph. geminatum 

 Kiitz., Alg. Aq. dulc. No. 13. Gomph. Leihlini Kiitz., 

 Synop. Diatom, jd. 568. fig. 46. 



Hab. On stones, &c., In freshwater spring, King's Clifi^, 

 ISTortliamptonsliire : Rev. M. J. Berkeley. Heufield, Sus- 

 sex : Mr. Borrsr. Mayfield, Sussex : Mr. Jenner. Yar- 

 mouth : 3Ir. Dawson Turner. Biver 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. 



The 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. Fig. 3. 



Char. Frustules curved, striated; terminal puncta well 

 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. Gomijh. 



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



Aq. dulc. No. 76. 

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



