CONTRIBUTIONS TO THE ANATOMY OF EARTHWORMS. 409 
has recently appeared (22, p. 450). This author had described 
in many Mollusca (21, p. 369), ramified glandular bodies 
arising from the pericardium, containing concretions in their 
cells. In his second communication (22) he suggests that the 
diverticula of the dorsal vessel in the Lumbriculidz which are 
covered with chloragogen cells are homologous structures; in 
both groups (Mollusca and Annelids) the pericardial gland is 
a special development of the peritoneum in connection with 
vascular enlargements (the pericardium of Mollusca is of 
course coelomic). 
In Pericheta Houlleti, in P. aspergillum, and in 
Acanthodrilus Rosz there are certain organs which are, I 
believe, referable to the same category. 
These organs were first described by Perrier (83, p. 100), in 
Pericheta Houlleti, as glands (‘‘glandes en grappe”’) open- 
ing into the cesophagus in segments vi and vit, close to the 
septum which separates these segments. These “ glandes en 
grappe”’ were stated by Perrier to consist of numerous acini 
connected with a branching system of ductules, which unite to 
form a thin-walled duct of considerable calibre. The acini are 
composed of very small nucleated cells. 
I have myself briefly described the glands in some examples 
of P. Houlleti, which were kindly collected for me in the 
Bahamas by Mr. W. F. R. Weldon. In my specimens there 
were three pairs of these organs, situated in segments v, v1, 
and vi1; they appeared to be connected by a longitudinal duct 
on each side (= the “ pyriform glands” of Perrier) and to 
open into the pharynx. Iam now convinced that the inter- 
pretation which Perrier and I myself placed upon these struc- 
tures are entirely wrong, and that they are not salivary glands 
at all. They certainly do suggest such structures, but a more 
careful examination of their minute structure, particularly in 
P. aspergillum—of which I have well-preserved examples— 
shows that the supposed ducts are only blood-vessels. 
Fig. 9 illustrates a small portion of one of these glands in 
P. Houlleti, which was teased out and examined in glycerine. 
Each “acinus” is a spherical body, consisting usually of a 
