232 



ANNUL AT A. 



In addition, there are oblique bands running from the sides to the mid- 

 ventral line. 



Peripatus has little more skeleton than the Annelida, the scattered 

 cuticular spines forming the nearest approach to an exoskeleton. 



Fig. 153.— A Dissection of Peripatus Capensis from 

 THE Dorsal Surface. 



(After Balfour.) 

 Tentacle 

 Oral Papilla. ^^ |\ // Pharynx. 



Brain.. 



Slime Gland 



Nerve Cord 

 (paired). 



Nephridium. 



Rectum. 



The coelom is not present as a body-cavity, but is in the adult only 

 represented by the cavities of the gonads and those of the nephridia. 

 The actual body-cavity is a venous blood-space which thus contains blood 

 and belongs to the blood- vascular system. Hence, as in the lobster 

 and the cockroach, it leads directly into the dorsal heart by paired 

 ostia or valves. The heart is itself a long tube lying dorsally, extending 

 nearly the length of the body. It is surrounded by a pericardial sinus, 

 as in the lobster. 



