66 



KR. BONNEVIE. 



[REP. OF THE "MICHAEL SARS" NORTH 



Summary of Gymnosomata. 



As will be seen from the above descriptions the 

 "Michael Sars" collection of gymnosomatous pteropods 

 includes 9 species belonging to three different families. 

 Of these 9 species only two were previously known, while 

 7 species are new to science, two of them, Ceplmlobrachia 

 macrochaeta and Microdonta longicollis being so diver- 

 gent from the previously described that they must be 

 regarded as the representatives of new genera. 



Only two species, Pneumodermopsis macrochira and 



Clione limacina were found in sufficient numbers to allow 

 any conclusions to be drawn regarding their geographical 

 distribution throughout the Northern Atlantic. 



It is a strange fact, demonstrating the paucity of our 

 knowledge of gymnosomatous pteropods, that in the small 

 collection of this group so many new species should be 

 found, while forms like Pneumodermopsis ciliata Gegen- 

 baur, P. paucidens Boas and Pneumoderma violaceum 

 D'Orbigny, already known from the Northern Atlantic, are 

 not represented. 



Christiania, April 1912. 



