PLATE X. 



BOUGAINVII.LIA MUSCUS, HeTEROCORDYLK CoNYBEAREI. 



Fig." 



1. Bougainvillia mnscm, magnified. 



2. The same, natural size. 



3. Planoblast of the same, shortly after liberation. 



4. Heterocordyle Conijbearei, magnified : a, hydranth, in which the tentacles have assumed a 



clavate form as the result of contraction; b, young hydranth ; c, blastostyle extended with 

 its sporosacs; d, the same contracted. 



5. A colony of Heterocordyle Conyhearei, natural size, spreading over a Buccinum shell. 

 C. Female sporosac of same. 



7. Male sporosac of same. 



