(66) 



be connected with the fructification ; but we have seen nothing- 

 analogous to fructification either imbedded among them or formed in 

 the articulations. 



The affinities of this species are very doubtful. They are not very 

 closely connected with the preceding, nor with any other with whicli 

 we are acquainted; and until the fructification is better understood, 

 there is perhaps no hope of a more satisfactory understanding of the 

 species. 



Dr. Greville has described the fructification as interrupted masses of 

 cylindrical or somewhat clavate filaments united in pairs by their bases, 

 whereas the stratum of moniliform filaments, above noticed, appears to 

 be iiltimately continuous, and the filaments not otherwise united than by 

 the siirface stratum of cells to which they are attached. 



In the young state the plant differs very little either in structure or 

 habit from Asjjerococcus echinatus, with which Captain Carmichael has 

 united it ; and even when old and covered with the radiating filaments, 

 the difference is perhaps only one of degree ; the stratum of filaments 

 diff'ering, perhaps, rather in their more general diffusion over the surface 

 of the frond than in their essential character. 



The plant is an intratidal species, preferring clear, rocky, rather 

 shallow pools, not much infested with other Algse. 



EXPLANATION OF PLATE CLIIL 



Fig. 1. — Chorda lomentaria, natural size. 

 2. — Transverse section of frond. 

 3. — Longitudinal section of frond at the contraction. 

 4. — Section near the base. 

 5. — Entire cross section. 

 6. — Filaments of periphery. All magnified. 



