G. TUBULARIA. 101 



sometimes tortuous, and firmly united together at 

 their lower part. 

 European seas. 



MOSSY. 



4. TuBULARiA musco'ides. Tubes nearly dichoto- 

 mous, marked at certain distances with transverse 

 rings ; many tubes united together, and forming very 

 thick tufts. 



European seas. 



TRICHOTOMOUS. 



5. TuBULARiA trichoides. Tubes lightly branch- 

 ing, in thick tufts, marked with rings, and of an equal 

 diameter throughout; height about a decimetre and 

 half. 



European seas. 



BRANCHING. 



6. TuBULARiA ramosa. Tubes branching; rami- 

 fications attenuated at their commencement, and 

 varying in length, but marked with rings throughout, 

 sometimes curved : height from five to seven centi- 

 metres. 



European seas. 



DV^ARF. 



7. TUBULARIA pygmcta. Tubes isolated, marked 

 with rings, somewhat flexuous, and slightly branch- 

 ing ; branches very short ; height about a centimetre. 



On the Amphiroa Dilatata of Australasia. 



