284 NEW YORK STATE MUSEUM 



of ganglia; the three pairs being united by an extremely short 

 broad commissural cord, which is very inconspicuous; the inner 

 pair of ganglia having somewhat the appearance of coalescing. 



The outer pair are larger than the others and somewhat ob- 

 scurely kidney-shaped. The anterior margin being rounded and 

 continuous; the posterior part being bilobed, the inner lobe larger 

 than the outer. 



The second, or median, pair of ganglia are in contact with the 

 inner part of the first mentioned pair for their entire length. 

 They are curved, broadest at the base, and tapering to a point, 

 very narrow at their widest point. 



The third, or inner, pair are nearly in contact at their anterior 

 part, gradually diverging posteriorly. They are comparatively 

 narrow, though twice the width of the second pair, and are about 

 four times as long as wide. They are each obscurely divided into 

 four lobes, of which the anterior is subtriangular, the posterior 

 nearly round, and the remaining two subquadrangular. 



The infra-esophageal ganglionic mass is much larger than the 

 supra-esophageal, (2), and consists of six pair of ganglia, aggre- 

 gated more or less in one mass. 



With the exception of the first pair the ganglia are regularly 

 bilaterally arranged; one of each pair being on opposite sides of 

 a median line. 



The first pair consist of a large and a small ganglion, the 

 larger one being ovate with a length about equal to twice its 

 greatest diameter. Immediately anterior to this is a small 

 ganglion, about one third the size of the first mentioned ganglion. 



The next pair are situated one on each side, and partially un- 

 derneath the first pair. They are subovate in form and are about 

 one and one half times the size of the first mentioned pair. 



The next pair are each about the size of the first mentioned 

 ganglion, and are oval or subovate in form, and are situated 

 mostly underneath the second pair, their anterior ends projecting. 

 The posterior ends of the second pair project, laterally, beyond 

 the third pair. 



The fourth pair are subovate in form and situated beneath the 

 second and third pair. 



