Art. IX. — Descriptions • of Neiv, or Little Known, 

 Polyzoa. 



Part VII. 

 By P. H. MacGillivray, M.R.C.S., F.L.S. 



[Read 10th July, 1884.] 



Family, Cellulariid^:. 

 Maplestonia, n. gen. Plate L, fig. 9. 



Polyzoary consisting of series of single and geminate cells, 

 connected by distinct, corneous tubes. Cells with the front 

 wholly occupied by a membranous area, or with the lower 

 part rilled in ; imperforate behind. No avicularia or vibra- 

 cula. 



M. cirrata. 



Portland, Mr. Maplestone ; Warrnambool, Mr. Watts. 



M. cirrata seems to be very rare, and I have only had an 

 opportunity of examining three or four specimens. It occurs 

 in minute purplish tufts, the branches curling inwards. 

 They are arranged in series of single and geminate cells. In 

 the single cells the front is usually entirely membranous, the 

 margins being thick and bevelled inwards ; in the geminate 

 cells the lower part is usually filled in by the cell wall. The 

 posterior surface is imperforate, and generally marked by 

 transverse, faint lines. The mode of branching is very 

 irregular. In all cases of geminate cells, each gives origin to 

 the first of a series, but in some cases two branches spring 

 from the summit of a single cell, or they may originate from 

 the sides of a cell. There is no appearance of avicularia or 

 vibracula. 



Family, Salicornariid^:. 



Cellaria rigida, n. sp. Plate I., figs. 1, 2. 



Polyzoary regularly dichotomously branched ; branches 

 cylindrical, slightly arcuate, usually enlarging upwards. 

 Cells mostly rhomboidal, pointed above and below ; mouth 

 in the upper half, lofty, slightly contracted towards the 



