pressed, those above them wider and longer, quadrate and nearly twice as 

 long as broad : again, the apical cells are always short while the frond is 

 in a growing state, as it increases by successive additions to the outer 

 margin. Fibrils simple or forked, taking hold of the rock by discs at their 

 tips. 



This is not an uncommon plant on various parts of our coast, 

 though frequently overlooked, owing to its hiding in crevices, or 

 creeping through the much-branched stony nullipores. When 

 occurring on rocks near low- water mark it is broader, less 

 branched, and of paler colour than when dredged from deeper 

 water. I am not able to detect satisfactory characters by which 

 to separate the Padina reptans of Crouan, for specimens of 'which 

 I am indebted to M. Lenormand. 



No one, in this country, has met with fructification, which 

 seems only to have been found by Dr. Areschoug, in Sweden. 

 He finds spores collected in undefined largish sori, near the base 

 of the frond. 



Fig. 1. Zonaria parvula : — the natural size. 2. Part of a frond : — magnified. 



3. Small portion of a lobe, to show the longitudinal, radiating lines of cells. 



4. A small part of the same, with undeveloped apical cells : — highly mag- 

 nified. 5. Fibrils: — highly magnified. 



