120 Jdimial of P^ntimiology ami Zoology 



group of animals. In it he shows in some forms a marked dorsal 

 gangHon and a \entral ganglion with the typical ner\es. Burger 

 showed that all ganglion cells are unipolar, without membranes. 

 Montgomery, 1897, discusses the minute anatomy of the ner\e 

 cells. Coe, 1895 and 1910, considers the general anatomy of the 

 ner\ous system, hut ner\ e iletails are for the most part not shown. 



In a young CarinclUi cingiilula Cole which I have studied by 

 means of reconstructions, I find no unusual features. The nervous 

 system is typical of the group. The brain, however, is not \ery 

 clearly made up of two lobes on each side. This may be because 

 the specimen used was a young one. This may also be the reason 

 why the brain is not sharply marked off from the lateral nerve cords. 



Figure 1 shows the brain and part of the lateral cortls from the 

 ventral side. From the two hal\es of the brain come the ner\es to 

 forward parts. Fhe small dorsal commissure is shown with its 

 usual median extension. From the larger ventral conmiissure come 

 the two nerxes to the proboscis, lateral to these are the nerves to 

 the intestine, while from the ridge of the lateral cords the lateral 

 nerves are shown. 



Figure 2 in the larger drawing at the right shows the ner\ous 

 system as viewed from the side with the dorsal side to the left. 

 The central core of the ganglion and cord is to indicate the posi- 

 tion of the fiber area. The small drawings at the left show \arious 

 levels of the ner\'oiis system as seen in cross section. The \-eiitraI 

 side is up. The drawing at the top is through the brain before the 

 commissures are reached, the next lower is through the thickest 

 part of the brain and the lower two drawings are through one ot 

 the lateral cords. 



Burger, O. 1891 



Beitarge zur kcmiuiis iles NiTvcnsystcms der VVirbellosen. Neue 

 Unter. iiber d.is Ncrx (■ns\^tenl der Ncnintinni. In-^r. a. d. Zoo). Sta. 

 Neah. 10. 



Burger, O. 189(1 



Beitragp zur Kcnntiii-. dcs Nci\(.-iis\ sli'iiis tier Nemeirincn. Zcit. 

 Wiss. Zool. Bd. I.. 



1895 



Die Nemcrtineii. 



Fauna u. Flora d. (lolles v. Neapel. 



