or Little Known, Polyzoa. 139 



Fig. 5. A. latipuncta, natural size. Fig. 5a. Portion mag- 

 nified. Fig. 5b. Avicularian cell. 



Fig. 6. Portion of specimen of Bracebridgia pyriformis, 

 natural size. Fig. 6a. Portion of the same magnified. 

 Fig. 6b. Two avicularian cells from the free edge. 

 Fig. 6c. Portion of older part of same zoarium. 

 Fig. 7. Young specimen, natural size. Fig. 7a. Two 

 Zooecia from the same, showing an apiculate mucro and 

 an oral avicularium. 



Plate III. 



Chitinous parts of — 



Fig. 1. A. foliacea. 



Fig. 2. A. parvipuncta. 



Fig. 3. A. australis. 



Fig. 4. A. latipuncta. 



Fig. 5. Bracebridgia pyriformis. 



Fig. 6. Poecilopora anomala. 



Art. XIII. — On an Apparatus for Utilising the Force 

 of the Tides. 



By Mr. Lockhart Morton. 



[Read December 10th, 1885.] 



Art. XIV. — On an Apparatus for Determining the 

 Stability of Ships. 



By C. W. M'Lean. 



[Read December 10th, 1885.] 



