266 CRYPTOGAMIA 



OBS. Of the genera FragUlaria and Diatoma, I have observed 

 several species, both on marine and fresh-water plants, but being 

 unable to refer them with certainty to the species already de- 

 scribed, I have deemed it the best plan to omit any description 

 of them. 



170. GOMPHONEMA. 



1. O. paradoscum, filaments crowded, pellucid, branched, each 

 branch terminating in a wedge-shaped yellowish body, containing 

 several granules towards the centre. GREV. Syn. 38. Echinetta 

 paradoxa, GREV. Crypt. Fl. t. 25. 



Hob. On various small marine Algce, very common in Ber- 

 wick Bay. 



2. G. minutissimum, filaments slender, branched, flaccid, tipped 

 with two tubular bodies containing granules towards the middle. 

 GREV. Crypt. FL t. 244. f. 1. 



Hob. In ponds and at the sides of still water, investing 

 small roots, mosses, &c. with a dense wool-like covering 

 of an ochraceous colour, common. 



3. G. geminatum^ filaments long, slender, entangled, branched, 

 the branches tipped with two long tubular bodies containing 

 granules. GREV. Crypt. Fl. t. 244. f. 2. 



Hob. In rivulets in deans. In the rivulet in Lumsden 

 Dean, most abundant. June. 



Dr GREVILLE'S figure corresponds very exactly with our 

 specimens, but they did not grow in round tufts ; on the 

 contrary, they formed a long densely hairy brown fila- 

 ment, probably influenced to assume this shape by the 

 force of the current. 



171. ECHINELLA. 



1. E. fasciculata, bodies linear, rather acute at the apex, fasci- 

 culate, springing from a convex transparent base. GREV. Crypt. 

 Fl. t. 16. f. 1-3. ; and t. 298. f. 3. a. 



Hal. On Conferva in Berwick Bay. It is frequent on 

 ScMzonema Smithii. 



