2rjQ Dr. A. S. Packard on an 



se])arate from its follow. One of these glands consists of a 

 stolon-like mass, running along close to the great collective 

 vein, and attached to it by irre^^ular Lands of connective 

 tissue, -which also holds the gland u\ place. From this hori- 

 zontal mass four vertical brandies arise, and lie between and 

 next to the partitions at tlic base of the legs, dividing the 

 sides of the body into conipartnients. The ]iosterior of these 

 four vertical lobes accompanies the middle h('[)atic vein from 

 its origin from the great collective vein, and is sent off oppo- 

 site the insertion of the fifth pair of feet. Halfway l)etween 

 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 

 tlian the others, slightly ascending at the end, which lies just 

 above the insertion of the second pair of feet. The two middle 

 lobes are directed to the collective vein. Each 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 ner\es. 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 

 failing. 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 Avhich the gland lies. 

 Each lobe, Avhen cut across, is oval, with a yelloAvish 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 Hoevcn, Owen, or 

 A. Milne-Edwards in their accounts of dissections of this 

 animal. 



When examined under a Ilartnack'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 



* Leydif^ (' Natiu-prcschichte der Daphniden') states tliat several ana- 

 tomists, after laborious attempts, have failed to find the opening to the 

 green pland in ajiy rrnstareaii. 



