MARINE POLYZOA. 19 



2. NELLIA SIMPLEX. PL LXV. fig. 1 ; PI. LXV. (bis) fig. 3. 



Outline of cell rounded above, contracted downwards, truncate 

 below. Margin much raised above. Aperture oval. 



Salicornaria marginata, Busk, op. cit. i. 367. 

 Hob. Prince of Wales Channel, Torres' Strait. 



Usually of a greenish colour ; but this may be adventitious, 

 although it is general and uniform throughout the specimen. 

 This species differs from the above in being much larger, and in 

 wanting the two perforations on each side above the mouth ; in 

 the less comparative size of the aperture, and in the remarkable 

 elevation of the sharp margin surrounding the upper half of the 

 cell. In the looser aggregation and in the form of the cells, it 

 shows the transition from the Salicoruariadae to Cellularia. 



Fam. 3. CELLULARIAD.E. 



Cells disposed in the same plane, forming linear branches of a 

 dichotoinously divided, phytoid, erect polyzoary. 



Bugulidffi, part., Gray, Cat. Brit. Rad. B. M. 110. 146. 

 Cellularidse, part., Johnst. Brit. Zooph. 



Escharidse, part., Johnst. Brit. Zooph. ed. 1. 248, ed. 2. 264; 

 Gray, Syn. Brit. Mus. 1847, 135. 



Synopsis of Genera. 



1. Cellularia. 



2. Menipea. 



3. Scrupocellaria. 



4. Canda. 



5. Emma. 



1. CELLULARIA. 



Cells bi-triserial, more than four in each internode; oblong 

 or rhornboidal, contiguous ; perforated behind. Without avicu- 

 larium or vibraculum, unless rarely the former on the upper and 

 outer angle of the cell. 



Cellularia, part., Pallas, Elench. Zool. ; Fleming, B. A. 

 Cellularia, Busk, MSS. 

 Bugula, part., Gray, List Brit. Rad. B. M. 114. 



1. CELLULARIA CUSPID ATA. PI. XXVII. figs. 1, 2. 



Upper and outer angle prolonged into a strong spine. A 

 single perforation behind. A cuspidate spine on the summit of 

 the median cell at each bifurcation. Ovicell smooth. 



