MORPHOLOGY OF MELIBE 573 



Protoplasma. Es lassen sich zwei Teile an dein Zellich unter- 

 scheiden : der den Kern umgebende protoplastische Teil und 

 der periphere pamblastische mit den Sekretvakuolen ; dieser 

 letztere wild mitsamt dem in ihnen gereiften Mucin bei der 

 Sekretion ausgetossen. Es bleibt in der Bindegewebskapsel 

 allein der protoplastische kernhaltige Teil iibrig, von dem aus 

 die Neuproduction des Zelleibis vor sich geht, sodass die 

 Sekretion zunachst in der Bildnng von Sekretionsvakuolen, 

 sodann aber in der Ausstossung des ganzen peripheren Teils 

 der Zelle mit dem gebildeten Sekret aus der bindegewebigen 

 Kapsel besteht. 



In the epithelium of the mucous gland of M. leonina, 

 as in the epithelium of the intestine and of the renal syrinx, 

 basal granules or desmochondria are demonstrable ; but in 

 the mucous gland the linear fibrillar arrangement of the micro- 

 macromeres of the cytoplasm is absent. The reason for this is 

 obvious ; the cilia also seem to end on the distal basal granular 

 border (PL 37, fig. 84, Bg, Feb). 



V. Summary. 



1. It is evidenced by the work of various authors that 

 Gould's Chioraera (1852) is identical with Bang's Melibe 

 (1 829) ; Chioraera, therefore, is a synonym of Melibe; 

 (Tould, at the time of his description, did not know of the 

 genus discovered by Bang. For these reasons I have con- 

 sistently named it throughout all my works on this species 

 Melibe leonina (Gould) in spite of the attempt of certain 

 authors to build on the nomenclature of Gould. 



2. Melibe leonina is absolutely void of masticatory 

 organs ; the generic description of Gould may be augmented, 

 therefore, to read in part, Bulbus pharyngeus aut cum mandi- 

 bulis aut sine mandibulis ; radula et lingua destitutus. 



3. The anterior end of M . leonina is formed into a large 

 cowl ; this has a pair of stalked foliaceous tentacles which may 

 be retracted below the edge of the stalk which then acts as 

 a sheath. The tentacles are very complex in structure, being 

 innervated with nervous tissue. The tentacles are not ciliated, 

 as claimed by Jeffreys (1869) for all nudibranchs. The cowl 



