APPENDIX. 373 



1. E. crystallina, Gray, 1. c. 



Cells in pairs; three spines on the outer edge, the 

 central usually the longest and strongest. 



Hab. — Bass Strait, 45 fathoms. 



Parasitic upon Polyzoa, &c. circinate branched — 

 branches irregular divaricate. The opening of the cell 

 triangular, very obliquely placed. 



2. Emma tricellata, n. sp. 



Cells in triplets ; three or four long spines on the upper 

 and outer part ; a small spine on the inner and lower part 

 of the edge of the opening. 



Hab. — Bass Strait. 



Parasitic upon Catenicella, &c. Habit long straggling, 

 very like the preceding species. The cells are more in- 

 fundibuliform, and the a^dcularium, which, as in E. crys- 

 tallina is not always present, is larger, but occupies the 

 same position on the cell. 



2. Polyzoary continuous throughout. 



Fam. 3. BICELLARIAD^. Frond wholly di\ided into 

 narrow ligulate, dichotomous, bi or multiserial branches ; 

 no vibracula. Avicularia when present pedunculate. 



14. BiCELLARiA, Blainville. 



Char. (B.) Cells turbinate, distant. Opening dii-ected 

 more or less upwards. Mouth submarginal. Several 

 curved spines, marginal or submarginal. 



1. B. tuba, n. sp. 



Opening round, looking nearly directly upwards; a 

 digitiform hollow process below the outer border supporting 

 2 — 4 long incm-ved spines ; 2 — 3 other long curved sub- 

 marginal spines behind or above the opening, none below 

 it in front — a solitary spine on the back a short way down 

 the cell. Avicularia very long, trumpet-shaped, arising 

 on the back of the cell. 



