322 



THE INVERTEBRATA 



of a simple sac ; and a single pair of slime glands discharging on the 

 oral papillae, made up of a much branched secretory part and a large 

 reservoir. The slime can be shot out and entangle an enemy. It is 

 never used in obtaining food. 



S op. 



Ofl. 



Fig. 218. Peripatus capensis, S, dissected to show the internal organs, x 2. 

 After Balfour, an. anus ; ant. preantenna ; brn. supraoesophageal gangHa ; 

 c.oes. circumoesophageal commissure; e.g. enlarged crural gland of last pair 

 of legs ; m.g. mid gut ; o.p. oral papilla ; ph. pharynx ; sal.gl. salivary gland ; 

 sl.gl. slime gland; v.n.c. ventral nerve cord; i, 2, 10, appendages of the trunk 

 segments; 4, excretory tubule of the fourth segment; <S op. male aperture. 



The nervous system (Fig. 2 1 8) consists of a pair of supraoesophageal 

 ganglia from which the preantennal nerves are given off, a pair of cir- 

 cumoesophageal commissures and two ventral cords which are widely 



