Explanation of Plates. 153 



presents the upper part of the protocerebrum {cf. fig. 12), and shows 

 mushroom body cells and normal ganglion cells lymg in a loose 

 mass beneath the neurilemma (nl), which here contains tracheae 

 and characteristic elongate nuclei. The minute glomerular bodies 

 on the head of the mushroom body are indicated, and also the large 

 tract r, tjrpical of Fasersubstanz, and the dorsal lobe, an example 

 of Punktsubstanz. Note the mass of irregular neuroglial nuclei 

 beneath one head of the bridge. 



The plates are in every case drawn with the aid of a drawing 

 eyepiece. 



