468 Haroın Harn, 
cross section (Pl. 25,.Fig. 21) a ridge may be seen to extend, like a 
typhlosole, along each canal. As in Alexandromenia neither of these 
canals opens directly into the pharynx but upon the summit of a 
small papilla that in turn is located at the bottom of a short tube 
opening on the side of the pharynx a little distance in front of the 
radula. Each papilla contains a few muscle fibres, and is probably 
capable in life of being projected through the pore directly into the 
pharynx. 
Behind the radula the pharynx passes directly toward the ventral 
surface, and after reaching a level below that of the great salivary 
glands it turns abruptly backward and finally passes into the 
stomach-intestine. Throughout the first half of its course behind the 
radula its walls continue to be folded longitudinally, but beyond 
this point not only do the ridges disappear but the tube itself 
becomes exceedingly slender (Fig. 1). As in the genus Alexandromenia 
the posterior three fourths of the pharynx behind the radula is 
enveloped in numerous lobulated glands closely resembling those 
situated anterior to the radula, the chief difference being in the 
larger size of the lobules of the posterior set. 
In its form and general relation to the other organs of the body 
the stomach-intestine is typical. A well developed anterior coecum 
is present, and sacculations, though not as clearly defined as usual, 
oceur at fairly regular intervals, throughout the greater part of its 
course. Its epithelial lining, however, is uncommonly thick and the 
cells composing it are accordingly unusally slender, and furthermore 
are filled with some secretory product in the form of spherical 
granules of different sizes. ÖOpposite the anterior end of the peri- 
cardium the gut becomes circular in outline, and as it rapidly 
narrows develops a few longitudinal folds that persist to the anal 
opening. 
The hermaphrodite „land, extending from the head region to 
the pericardium, contains multitudes of spermatozoa and ova in an 
advanced stage of development. Masses of sperms occur in the 
spacious pericardial cavity, but as no trace of them is found in the 
adjoining section of the coelomoducts this is probably an abnormal 
state of affairs. The last named canals leave the pericardium as 
well defined structures, and enlarging but slightly, make their way 
forward to join the shell gland. Their walls throughout consist of 
columnar cells with basal nuclei, the remainder of the cell being 
filled with a faintly staining, almost homogeneous secretion that in 
