PEOCTONOTUS MUCKONIFEEUS. 



from satisfactorily ascertaining their functions ; they seemed to want the central coloured 

 vessel of the lateral papillae, but perhaps might be considered equally with the others to 

 perform the office of branchiae. Our captive was not of active habits ; it moved seldom 

 and never quickly, and when it floated in the usual inverted position, which it did occasion- 

 ally, it made no exertion whatever to assist its progress. 



Fig. 1, 2, 3. Proctonotus mucroniferus in different positions. 

 4. A row of the papillae more highly magnified. 





