The elegant little Alga that forms the subject of our present 

 Plate, appears by its structure to be entitled to rank as the type 

 of a genus, of which, at present, it is the only known species. 

 Until the fructification shall have been discovered, its exact place 

 in the system cannot be clearly determined ; and whether it is 

 in future to rank near Catenella, or near Endodadia and Gloio- 

 peltis, or again near Caidacafdhiis, with all of which it has points 

 in common, remains to be seen. 



It is of rather rare occurence. My specimens were generally 

 found on Sarcocladia obesa, on which plant, owing to similarity 

 of colour, they are apt to be overlooked ; that selected for draw- 

 ing grew on AmpMroa anceps. 



The generic name is given in honour of the accomplished 

 Author of ' Parables from Nature,' ' Worlds not Realized,' and 

 other juvenile works, which deserve a still wider circulation than 

 they have yet attained, and who has fairly earned a place in the 

 gratitude of " Algoloquists " by her useful ' Hornbook of Phyco- 



Fig. 1. Gattya pinnella, growing on AmpJiiroa anceps, — the natural size. 3. 

 Portion of the ixonA.,— somewhat enlarged. 3. Apex of a pinnule cut open 

 to show the axile filament. 4. Transverse section of the same. 5. One of 

 the dichotomous, horizontal ramelli : — the latter figures highly magwified. 



