DIPLOBRACHIA BELAJEVl 



377 



152^4). The ventral ends of the keels touch each other but do not fuse, while 

 the dorsal ends are fused together. The groove between the mesosoma and 

 the metasoma is slanting, as in D. japonica. 



s- 



Fig. 152. Diplobrachia belajevi: A - front end of the body from the ventral side; В - the same from 

 the dorsal side; С - cuticular plaque from a metameric papilla, and, D - one from the zone of 

 thickened papillae ; E - tube. 



с - cephalic lobe ; f- keel of the bridle ; ms - mesosoma ; tnts - metasoma ; p - plaque ; pa - papillae ; 

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

 mesosoma and the metasoma ; sv - ventral sulcus ; t - tentacle. 



The rounded medium-sized metameric papillae of the trunk (Fig. 152^4) 

 have not been counted, but they certainly exceed 20 pairs in each specimen. 

 On the surface of each lies a very delicate cuticular plaque which has its 



