ATLANT. DEEP-SEA EXPED. 1910. VOL. III]. 



PTEROPODA. 



51 



Species 



Median tooth of the radula 



Jaw 



Hook-sacs 



Gills 



posterior 



lateral 



Special 

 characters 



Clione limacina 

 Phipps 



Pa radio ne 

 pelseneeri Tesch 

 (From Tesch) 



Cephalobrachia 

 macrochaeta 

 nov. gen. et sp. 



<y 



None 



Oviform. 



Hooks of 



different 



lengths, 



all reaching 



the opening 



of the 



invaginated 



sack 



None 



None 



Buccal 

 cones 



Glandular 

 lip 



Notobranchaea 

 inopinata et 

 macdonaldi Pels. 



Notobranchaea 

 Valdiviae Meis. 

 (From Meisenh.) 



Notobranchaea 

 tetrabranchiata 

 n. sp. 



Fowlerina 

 zetosios Pels. 

 (From Pels.) 



Fowlerina 

 hjortii n. sp. 



Microdonta 

 longicollis 



nov. gen. et sp. 



3 

 radial 

 crests 



A 

 row of 

 small 

 spines 



Shallow 

 with 

 short 



hooks 



4 

 radial 



crests 



None 



Ring and 

 4 crests 



^? 



4 

 radial 

 crests 



None 



Proboscis 

 simple 



Proboscis 



a 



complex 



organ 



Proscobis 

 long 

 simple 



