( 184 ) 



hesitation to the figiire of the present in Phyc. Brit, with which they 

 perfectly agree in habit and branching, had not the contracted nodes of 

 endochrome, on which Professor Harvey makes the distinction depend, 

 obhged us to refer it to that species, with which it also accords in size 

 and habitat. 



We therefore give the species rather in deference to the high 

 authority who introduced it than from any conviction of its being 

 distinct ; acknowledging at the same time that we have not had an 

 opportunity of examining authentic specimens. 



ECTOCARPUS LANDSBURGII. 



EXPLANATION OF DISSECTIONS, &c. 



Fig. 1. — Ectocarjnis Landsburgii, natural size. 

 2. — Branch. 

 3. — Portion of same. Both magnified. 



