10 



louin.il ol Entomology and Zoolog\ 



group ol .num. ils. In it he shows in some tonus .1 marked dorsal 

 ganglion and .1 ventral ganglion with the typical nerves. Burger 

 showed that .ill ganglion cells are unipolar, without membranes. 

 Montgomery, 1897, discusses the minute anatomj oi the nerve 

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

 nervous system, hut nerve details are for the most part not shown. 



In .1 young ( ■• Cole which 1 have studied h\ 



means ol reconstructions, 1 find no unusual features, I he nervous 

 system is typical ol the group, I ho brain, however, is not verj 

 elearh made up ol two lobes ow each side, I his m.i\ be because 

 the specimen used was .1 young one, 1 his ma) also be the reason 

 w h\ the brain is not sharpl) marked o ft from the lateral nerve cords. 



Figure 1 shows the brain and part ol tlu lateral cords from the 

 ventral side. From the two halves ol the brain come the nerves to 

 forward parts. fhe small dorsal commissure is shown with its 

 usual median extension. From the larger ventral commissure come 

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

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

 nen es are show n. 



Figure - 1 in the larger drawing .it the right shows the nervous 

 system .is viewed from the side with the dorsal side to the left, 

 rhe central core ol the ganglion and cord is to indicate the posi- 

 tion ol the fiber area, Phe sm. ill drawings .it the left show various 

 levels oi tlu~ nervous s\stom .is soon in cross section. I ho ventral 

 side is up. I ho drawing .it the top is through the brain before the 

 commissures are reached, the next low or is through the thickest 

 p. lit of the brain and the lower two drawings are through one ol 

 the lateral cords, 



1891 



Beitarge eui kenntnis des Nervensystems ^K- 1 VVirbellosen. None 



Unter. tibei das Nervensvstem dei Nemertinen, ln>t. a. d. Zool. S1.1. 

 Neah, 10, 



. .. ,) 1890 



Beitrage kui Kenntnis des Nervensystems dei Nemertinen, Z< 

 Wiss. Zool. Bd, I . 



1895 

 1 ) e Nemei tinen. 

 Fauna u. Flora d. Golfes v, Neapel, 



