as packthread at base, naked but warted or spinous in the lower third, thence 

 to the apex closely set with alternate, filiform, setaceous, irregularly dicho- 

 tomous rainuli. Fcsicles none. Receptacles formed from the scarcely thick- 

 ened ends of the branchlets, constricted at siiort intervals, nodoso-raonili- 

 form, and tapering to a fine point. Colour a very dark olive-brown, turning 

 black in drying. Substance coriaceous, rather brittle when dry. 



It is impossible in an octavo, or even in a folio plate, to do 

 adequate justice to a gigantic Alga like the present, which can 

 only be seen in its perfect form, stretched ont (like Milton's 

 hero) on the sea-shore. I can only show the stump and the tip 

 of one of its long arms ; and must refer the student, for its other 

 characters, to the detailed description. Fortunately, there is no 

 species of Cijstophora with which it can be confounded ; for it is 

 the only one that has branches springing from the edge (not the 

 broadside) of a fattened stem. I have never seen vesicles, nor 

 are they described by Turner or Agardh. This species does not 

 occur, so far as I am aware, in West Australia. After passing 

 Cape Northumberland, which seems to mark the western limit 

 of several of the larger Fucoids, it becomes abundant, and con- 

 tinues through Bass's Straits to Tasmania. 



YW. 1. Cystophora spartioides ; portion of the stem, with the base of a 

 pbma. 2. Apex of a pinna : — both the natural size. 3. Portion of one of 

 the ultimate dichotomous ramiili, with beaded receptacles Ibrmed from the 

 terminal segment, — moderately magnified. 



