Nachdruck verholen. 

 Überseizungsrecht vorbehalten. 



Mycetomorpha, a new Rhizocephalan 



(witli a note on the sexual condition of Sylo n). 



By 

 F. A. Potts, 



Fellow of Trinity Hall, Cambridge (England). 

 (From the Zoological Laboratory of the University of Cambridg-e.) 



With Plates 15—16 and 12 Fignres in the text. 



Contents. 

 Introduction. 

 The Host. 



General Account of the Anatomy. 

 The Rootsystera. 

 The Mantle Duct. 



The Mantle Cavity and its relation to the Visceral Mass. 

 The Structure of the Visceral Mass. 

 The Developing Eggs. 

 The Glands of the Visceral Mass. 

 The Larvae. 



Relationships of Mycetomorpha. 

 Diagnosis of Mijcetomorpha vancourcrensis. 

 A note on the sexual condition in Sijlon. 



Introduction. 



The animal which is described here under the name oi Myceto- 

 morpha vancouverensis n. g. n. sp. was dredged outside the harbour 



