APPENDIX. 371 



indistinct spines above ; vibraciilum large, sinus deep. An 

 enormous anterior avicularium, as wide as the cell. 0^d- 

 cell lofty, with numerous punctui'cs over the surface. 



Hab. — Louisiade Archipelago. Bass Strait. 



Distinguished from the former species by the enormous 

 anterior avicularium, and the form of the opening. Another 

 peculiarity of this species is the curious serrated appearance 

 of the radical tubes. 



12. Canda, Lamouroux. 



Char. (B.) Cells rhomboidal, sinuated on the outer side 

 for the lodgment of a vibraculum. No sessile avicularium 

 on the upper and outer angle in front. An uncertain 

 number of flexible avicularia, arranged along the middle 

 of the branches, and in much less number than the cells. 



This genus is at once distinguished from Scrupocellaria, 

 to which it is otherwise closely allied, by the absence of the 

 sessile avicularium on the upper and outer angle in front, 

 and also by the circumstance, that although there ars 

 flexible anterior avicularia, they do not correspond in 

 number with the cells, but seem to be disposed in a special 

 tract along the middle of the branch or internode. The 

 connexion of the branches by transverse tubular fibres is 

 not a character of either generic or specific importance, 

 though it is more striking in the only species hitherto 

 known as belonging to this genus, than in any other. 

 These transverse tubular fibres are, like the radical fibres 

 in Scrupocellaria, always inserted, not into the body of a 

 cell, but into a vibraculum. They are e%ddently of the 

 natnre of a byssus. 



1. C. arachnoides, Lamouroux. 



Cells biserial ; opening oval, truncated above, and the 

 upper margin recedent, with a spine on each side, the 

 •outer the longer surface of cell covered with transparent 

 granulations. 



2 B 2 



