28 MARINE POLYZOA. 



1. EMMA CRYSTALLINA. PI. XL. 



Cells in pairs ; one, two or three spines on the outer edge, the 

 central usually the longest and strongest. 



Emma crystallina, Gray, Dieffenb. New Zealand, ii. 293 ; Busk, 



Voy. of Rattlesn. i. 373. 

 Hab. Bass' Strait, 45 fathoms. New Zealand, Hooker. 



Parasitic upon Polyzoa, &c., circinate, branched; branches 

 irregular, divaricate. The opening of the cell triangular, very 

 obliquely placed. 



2. EMMA TRICELLATA. PL XLI. 



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 

 margin of the aperture. 



Emma tricellata, Busk, Voy. of Rattlesn. I 373. 

 Hab. Bass' Strait. New Zealand, Hooker. 



Parasitic upon Catenicella, &c. Habit long, straggling, very 

 like the preceding species. The cells are more infundibuliforin, 

 and the avicularium, which, as in E. crystallina, is not always 

 present, is larger, but occupies the same position on the cell. 



2. INARTICULATA seu CONTINUA. Polyzoary continuous 

 throughout. 



1. UNISERIALARIA. Cells disposed in a single series. 



Fam. 4. SCRUPARIAD^E. 



Cells uniserial. Junctions rigid or of the same consistence 

 as the cells. Polyzoary usually loosely adnate. 



Crisiadje (part.), Gray. Syn. Brit. Mus. 1842, 135. 

 Scupariadse, Gray, List of Brit. Rad. B. M. 132, 149. 

 Eucratiada3, Johnst. B. Z. ed. 2. 288. 



Synopsis of Genera. 



1. Scruparia. 



2. Hippothoa. 



3. ^Etea. 



4. Beania. 



1. SCRUPARIA. 



Cells decumbent ; aperture oblique, subterminal: Branches 

 given off from the front of a cell below the aperture. 



Scruparia a, Oken, Lehrb. Nat. 90, 1815. 



