SYNOPSIS. 



Gen. 12. Pterochilus, Aid. & Hanc. Tentacles 2, simple ; head with lateral lobes : branchiae papillose, 

 arranged down the sides of the back : anus lateral. 



P. pulcher, A. & H. 

 P. minimus, For. 



Gen. 13. Hermcea, Loven. Tentacles 2, longitudinally folded : head without lobes : branchiae papil- 

 lose, arranged down the sides of the back : anus dorsal or sublateral. 



H. bifida, Mont. 



H. dendritica, A. & H. 



Gen. 14. Alderia, Allman, M. S. Without tentacles : head lobed at the sides : branchiae papillose, 

 arranged down the sides of the back : anus dorsal. 



A. modesta, Loven. 



Gen. 15. Proctonotus, Aid. & Hanc. Tentacles 4 : a veil over the head : branchiae papillose, arranged 

 on a ridge down the sides of the back and round the head in front : anus dorsal. 



P. mucroniferus, A. & H. 



