382 



PART II. SYSTEMATIC ACCOUNT 



E D 



Fig. D152. Diplobrachia southwardae: A - front end of the body from the dorsal, and B, from the 

 ventral side ; С - part of a tentacle ; D - the ventral part of a keel of the bridle ; E - the metameric 

 part of the metasoma from the ventral side ; F - a plaque from the metameric region ; H - the 

 zone of thickened papillae from the ventral side ; / - a plaque from the zone of thickening. 

 с - cephalic lobe ; со - dorsal ciliated band ; f- bridle ; gt - pyriform gland ; ms - mesosoma ; 

 p - plaque; pa - papillae; pa 1 - papillae from the zone of thickening; pi - pinnules; ps - proto- 

 soma ; s 1 - groove between the protosoma and mesosoma ; s 2 - groove between the mesosoma and 

 metasoma; sv - ventral sulcus; t - tentacle. 



