OF NORTHUMBERLAND AND DURHAM. 293 



These two plants are recorded by Dr. Johnston (Terra Lin- 

 disf., vol. i., p. 284) as occurring on our coast, but the exact 

 localities are not given. — N. 



4. M. VERRUCATA, LamouT. Harv. Man., p. 109. Phyc. Brit., 



t. 347 (C). Atlas, PI. XXXVI., fig. 165. 

 Johnst. and Cr., vol. i., p. 115. 

 On Phyllophorse, Farcellaria, &c.— (7. S. B.—^. D. 



5. M. pusTULATA, Lamour. Harv. Man., p. 109. Phyc. Brit., t. 



347 (D). Atlas, PI. XXXVL, fig. 1G6. Johnst. 



and Cr., vol. i., p. 117. 

 On Laminaria digitata at Whitley. — G. S. B, — N. 

 The present arrangement of the Melobesue must be considered 

 merely a temporary one, the characters by which they are 

 distinguished being often quite insufficient to constitute good 

 species. The subject is intricate, and requires closer inves- 

 tigation than it has yet received. Dr. Johnston held that the 

 nullipores met with between tide marks were simply the begin- 

 nings of the growth of corallines, but I believe few naturalists 

 agree with him in that opinion. The presence of ceramidia in 

 the Melohesice is strong, though scarcely conclusive, evidence of 

 their being fully developed organisms. 



37. DELESSERIA, Lamour. 



1. D. siNuosA, Zamowr. Harv. Man., p. 114. Phyc. Brit., t. 



259. Atlas, PI. XXXVII., fig. 170. Johnst. 

 and Cr., t. 45. 

 Fucus sinuosus. E. Bot., t. 822. 

 Parasitic on the larger Fuci, chiefly on Laminaria digitata. 

 Not uncommon. — N. D. 



2. D. ALATA, Lamour. Harv. Man., p. 114. Phyc. Brit., t. 



247. Atlas, PL XXXVIL, fig. 171. Johnst. 

 and Cr., t. 42 (A). 

 Fucus alatus. E. Bot., t. 1837. 



VOL. IV., PART IV. 2 N 



