HEPTABRACHIA CELEBENSIS 



355 



the bridle (Fig. D144D, E). Slight ventrolateral ridges are present on the 

 protosoma and anterior mesosoma, but these are scarcely visible on the 

 stretched specimen (Fig. D144G). The bridle consists of a wide ridge bearing 

 narrow keels which are joined on the ventral side but separated by a very 

 small gap on the dorsal side (Fig. D144Z), E). 



"The metameric region of the trunk is 4 mm long and at its anterior end 

 the papillae are joined together to form lateral ridges of apparently glandular 

 epidermis with slight humps around the aperture of each pyriform interior 



Fig. D144. Polybrachia celebensis: A- anterior part of the tube with rings and collars. С, В - middle 

 and posterior parts of the tube ; D, E, F - ventral, dorsal and lateral views of the anterior end of a 

 contracted animal ; G - ventral view of the anterior view of an extended animal ; H - arrangement of 

 plateletes in part of a girdle ; jf - an adhesive plaque from a preannular papilla. Afterlvanov 

 (1961 c). 



gland, but in the last 2 mm the ridges disappear and the paired papillae 

 become more spread out. They finally become irregular and merge into the 

 region of unpaired papillae, which are rather small and scattered along the 



