256 . Dr. A. S8, Packard on an 
separate from its fellow. One of these glands consists of a 
stolon-like mass, running along close to the great collective 
vein, and attached to it by irregular bands of connective 
tissue, which also holds the gland in place. From this hori- 
zontal mass four vertical branches arise, and lie between and 
next to the partitions at the base of the legs, dividing the 
sides of the body into compartments. The posterior of these 
four vertical lobes accompanies the middle hepatic vein from 
its origin from the great collective vein, and is sent off oppo- 
site the insertion of the fifth pair of feet. Halfway between 
the origin of the vein and the articulation of the foot to the 
body it turns at a right angle, the ends of the two other lobes 
passing a little beyond it, and ends in a blind sac, less vertical 
than the others, slightly ascending at the end, which hes just 
above the insertion of the second pair of feet. The two middle 
lobes are directed to the collective vein. Hach lobe is flattened 
out somewhat, and lies close to the posterior wall of the com- 
partment in which it is situated, as if wedged in between the 
wall and the muscles between it and the anterior portion of 
the compartment. Each lobe also accompanies the bases of 
the first four tegumentary nerves. I could not make out any 
general opening* into the cavity of the body by injection of 
the gland, or any connexion with the hepatic or great collec- 
tive vein, all attempts to inject the gland from the veins 
failmg. The four lobes certainly end in blind sacs. The 
lobes are irregular in form, appearing as if twisted and 
knotted, and with sheets and bands of connective tissue form- 
ing the sheaths of the muscles among which the gland hes. 
Each lobe, when cut across, is oval, with a yellowish interior 
and a small central cavity, forming evidently an excretory 
duct. The gland externally is of a bright brick-red. The 
glandular mass is quite dense, though yielding. It is singular 
that this conspicuous gland, though it must have engaged their 
attention, has not been noticed by Van der Hoeven, Owen, or 
A. Milne-Edwards in their accounts of dissections of this 
animal. 
When examined under a Hartnack’s no. 9 immersion-lens 
and Zentmayer’s B eyepiece, the reddish external cortical 
portion consists of closely aggregated irregularly rounded 
nucleated cells of quite unequal size; and scattered about in 
the interstices between the cells are dark reddish masses which 
give colour to the gland. They are very irregular in size and 
* Leydig (‘ Naturgeschichte der Daphniden’) states that several ana- 
tomists, after laborious attempts, have failed to find the opening to the 
green gland in any crustacean. 
