Marshall—On the Anatomy of the Dragonfly. 771 
A transverse section of the rectum shows that the glands 
are well marked off from the spaces between them. The glands 
themselves are composed of long columnar cells, varying in 
length in different parts. Those along and near the margins of 
the glands are shorter than the more centrally located ones. 
The nuclei of these cells are elongated with rounded ends and 
each lies near the center of the cell to which it belongs, Hear 
the base of these cells and just within the basal membrane 
there is an irregular row of the nuclei; these are large and more 
spherical than the regular ones. The cuticular layer cover¬ 
ing the rectum, is rather thick and the regular muscular layers 
are not well developed. In transverse section that part of the 
wall situated between the glands is folded and the epithelial 
cells, as contrasted to those of the glands, are very much re¬ 
duced in size. Just anterior to the anus the rectal glands cease 
and the entire wall of the hind-intestine becomes very thin. 
There are a number of small muscles found on the rectum; 
these are easily seen in a dissected specimen to pass in part 
from the rectum to the wall of the body. A transverse sec¬ 
tion through the posterior half of the rectum shows that these 
muscles are attached to the narrow spaces between the rectal 
glands (SadoneS', 24). From each of these spaces there is, in 
the posterior part of the ninth segment, a group of from two 
to four muscles which pass to the wall of the body at the an¬ 
terior part of the tenth segment; the two most dorsal groups 
are larger than the others. Ventral and also somewhat lateral 
there are at either side two or three small muscles which, leav¬ 
ing the rectum, also between the rectal glands, pass forward 
to the body wall at the side of and on the anterior end of the 
ninth segment; here they have a common point of insertion. 
Salivaky G-lands. 
The salivary glands of the Odonata received but little at¬ 
tention until the appearance of the paper by Bordas (3), in 
this work these glands were described for a number of different 
species of dragon flies. The first special work on the subject 
