PLATE VIII. 



DiCORTNE CONFEKTA. 



Fig. 



1. Portion of a colony enlarged. The sporosacs are borne upon blastostj'les, which spring, some 



from the hydrocaulas, and some from the hydrorhiza. 



2. A colony of the natural size, spreading over a shell of Biiccinuni nndatum. 



3. The female locomotive ciliated sporosac, shortly after liberation from its ectotheca, as it 



appears vi'hen swimming. It is viewed at right angles to the plane of its two 

 tentacles. 



4. The same viewed in the plane of the tentacles. 



5. The male sporosac still enclosed within its ectotheca. 



6. The same after liberation from the ectotheca, as it appears when swimming. 



7. Longitudinal section of a female sporosac made at right angles to the plane of the tentacles, 



and viewed under slight compression. 



