Plate XVIII. 



Fig. 62. Cuspidella grandis. 



A. Natural size. 



B. C. Hydrothecae. 



Fig. 63. Cuspidella humilis. 



A. Natural size. 



B. Hydrothecae and hydrant h. 



Fig. 64. Lovenella producta. 



A. Natural size. 



B. C. D. Hydrothecae with pedicels. 



E. Pedicels with group of thread cells. 



F. Group of thread cells further enlarged. 



Fig. 65. Opercularella lacer at a. 



A. Natural size. 



B. Portion of colony showing mode of branching, hydrothecae, hydianths 



and gonophores. 



Fig. 66. Stegopoma plicatile. 

 A Natural size. 



B. Fascicled stem with hydrothecae. 



C. Terminal portion of branch. 



