PART VI 



PULMONATA 



AND 



OPISTHOBRANCHIA TECTIBRANCHIATA 



Trlbe BULLOMORPHA. 



Though the moUusks dealed with in this part, do not belong to the Prosoóranc/iia, 

 Prof. Weber thought it would be fit, that I should record them. It was not without hesitation 

 that I have undertaken this task, as far as concerns the Opisthobranchia Tectibranchiata, 

 Tribe Bztlloiuorpha, the Niidibranchiata and other tribes of Tectibranchiata^ even one species 

 belonging to the Tribe BuUomoi'pJia^ having already been treated by R. Bergh (monograph L); 

 but with the kind assistance of Mr. Smith, who compared many of the small species, with the 

 numerous forms which are described, but not figured by Adams and other authors, I have now 

 accomphshed it. The present part contains 19 species of land- and freshwatermollusks, of which 

 2 are new to science, and 41 species of Opisthobranchia Tectibranchiata Btilloviorpha^ with 

 15 n. sp. and a few varieties. 



SIBOGA-EXPEDITIE XLIX'/. 5g 



