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APPENDIX. 



1. Meliboea. 

 The genus Meliboea was instituted by M. Sander 

 Rang, for some pelagian Mollusca observed by him 

 on floating marine plants, in the seas around the Cape 

 of Good Hope. The structure of the branchiae and 

 tentacula of my Manx animal evidently associate it 

 with Rang's genus, whilst the absence of capital ap- 

 pendages indicate its being the type of a subgenus. 

 I have not seen the characters of the genus Doto of 

 Ocken ; but as all the references to that genus which 

 I have met with, indicate a near relation to the ani- 

 mal under consideration, I have adopted that title for 

 the division proposed, in preference to creating a new, 

 and perhaps useless synonym. The Doris pinnatifida 

 of Montagu, (Tritonia pinnatifida of Cuvier,) appears 

 to belong to the normal section of the genus Meliboea, 

 judging from the figure and remarks by Dr. Johnston, 

 in the eighth volume of the Magazine of Natural 

 History. 



