NEW MA I.I.ol'II A<iA . 171 



ganglia are given off branches t(3 the mouth-parts and 

 sense-organs. Each thoracic ganglion sends laterally a 

 large branch to the corresponding legs. Tiie last one 

 gives off, in addition to these, branches that go back- 

 wards into the abdomen, supplying the organs there sit- 

 uated. In Eari/)iidojms taunts (plate xvi, fig. 7) the 

 brain is large, much wider than long, and consists of 

 two lobes united in the middle line. Each lobe expands 

 greatly laterally. The posterior border of the brain is 

 convex, notched in the middle line. The anterior bor- 

 der is very concave. The brain, therefore, presents 

 from above the appearance of being composed of two 

 large lateral masses connected in the middle line by a 

 narrow commissure. From each anterior outer angle a 

 trunk passes downward and backward to the anterior 

 end of the sub^esophageal ganglion. These form the 

 circumcesophageal commissures, and from each a small 

 trunk runs forward to a very large frontal ganglion sit- 

 uated in the median line between the anterior ends of 

 the two cerebral lobes. The subtesophageal ganglion is 

 larger than the brain and is situated in tlie lower part 

 of the head beneath the cesophagus near the occipital 

 margin. It is somewhat triangular in shape, with one 

 side turned forward. 



The brain and subcesophageal ganglion of yienopontltan 

 (plate xvi, fig. 8) are very similar to those of Eunjiadopus 

 taurus. Dorsoventral longitudinal sections show that 

 the brain is rather thick and that tlic lateral lobes are 

 expanded posteriorly as well as laterally. The circum- 

 lesophageal commissures are inclined at an angle of about 

 forty-five degrees. The frontal ganglion is smaller than 

 '\n Eurymetopufi taurus and is connected by a short trunk 

 with the upper end of each circunnesophageal commis- 

 sure. From it a branch runs forward to the labium. The 



