430 



COMPARATIVE ANATOMY 



CHAP. 



Peripatus capensis). The longi- 

 tudinal trunks show slight seg- 

 mental swellings corresponding 

 with the extremities ; they are 

 also provided with a continuous 

 layer of ganglion cells. At the 

 posterior end of the body they 

 pass over into each other above 

 the rectum by means of a con- 

 necting portion in which the 

 layer of ganglion cells is want- 

 ing. Numerous nerves go off 

 laterally from the longitudinal 

 trunks along their whole course ; 

 these diverge at regular inter- 

 vals and more or less correspond 

 with the transverse commissures. 

 Each extremity is supplied with 

 two such lateral nerves. The 

 nerves for the jaws diverge at 

 the points where the longitud- 

 inal trunks enter the brain ; 

 rather farther back (or at the 

 posterior end of the cesophageal 

 commissure) arise the nerves for 

 the oral papillae. Besides small 

 nerves, the brain gives off strong 

 nerves to the antennae. From 

 its lower portion two more nerves 

 arise which run to the tongue 

 and the dorsal wall of the 

 pharynx, and unite at the com- 

 mencement of the oesophagus into 

 an unpaired mediodorsal nerve 

 forming a sympathetic nervous 

 system. 



The two eyes correspond to 

 some extent in their structure 



FIG. 293. Anatomy of Peripatus cap- 

 ensis (after Balfour). The enteric canal 

 behind the pharynx is cut off and removed. 

 g, Brain ; a, antenna ; op, oral or slime papil- 

 lae ; sd, slime glands ; sr, slime reservoir, which 

 at the same time acts as duct to the glands ; 

 04, sog, SOQ, SOQ, nephridia of the 4th, 5th, 6th, 

 and 9th pairs of limbs ; cd, elongated coxal 

 gland of the last pair of feet ; go, genital aper- 

 ture ; an, anus ; ph, pharynx ; n, longitudinal 

 trunk of the nervous system. 



