XII 



v. Classis: iWollttSCa.! 



Ordo: Acephala, Cuv. 



Genus : Botryllus, Gaertn. 



De evolutione fætus. 



Ordot Gasteropoda, Cuv. 



Genus : C y p r æ a , Linn. 



1. Spee. C. norvegica, nov. 

 Genus : B u 1 1 æ a , Lam. 



1. Spee. B. granulosa, nov. 

 Genus : A c t æ o n, Oken. 



1. Spee. A. minutum, nov. 



Ordo: Pteropoda, Cuv. 



Genus: Cirropteron, nov., Atlanti affine. 



1. Spee. C. semilunare, nov. 



2. Spee. G. ovale, nov. 



