224 DORYMENIA PERONEOPSIS. 



The outlet of the anterior pedal gland, when viewed laterally from the 

 mid line, presents the appearance of a fairly long, narrow sUt (Plate 7, fig. 5). 

 In cross sections this slit is seen to expand laterally into a well-developed chamber 

 with corrugated walls composed of columnar cells furnished with a heavy coat 

 of cilia. The folds of the dorsal wall merge into a single median fold which 

 more posteriorly becomes continuous with the foot. Everywhere through- 

 out this fold, and over the entire surface of each crypt, the secretion of the 

 anterior pedal gland makes its exit in the form of a finely granular, almost 

 homogeneous substance with a strong affinity for haematoxylin dyes. 



The posterior pedal gland is moderately developed, and in the form of 

 a slender rod of cells on each side of the mid Une continues from the anterior 

 pedal gland to the cloacal opening. The foot itself presents the usual wedge- 

 shaped form, accompanied on each side by a non-spiculose hypodermal layer, 

 both structures serving as the outlet for the secretion of the gland. 



The atrial opening, holding the customary subterminal position, leads 

 into a cavity possessing essentially the same relations as in various other species 

 of neomenians. Two horseshoe-shaped ridges, an internal and external, sur- 

 round the cirrose area and after uniting posteriorly gradually shade into the 

 folds of the pharynx. The component cells are slender, columnar elements 

 moderately cihated and are supported by a framework of muscle and connective- 

 tissue fibres penetrated by slender blood sinuses and a few nerve bundles from 

 the adjacent ganglionic mass. The cirri are prominent, finger-shaped struc- 

 tures, arising from separate bases or united into groups of from two to four, 

 and are composed of low columnar or cubical cells ranged about a slender cavity 

 too small to admit of the entrance of blood corpuscles though containing deU- 

 cate fibres of unknown character. 



A short distance posterior to the cirrose area the pharynx arises as a circu- 

 lar tube of somewhat smaller diameter than that of the atrial cavity. At the 

 outset its walls are fashioned into numerous longitudinal folds, especially along 

 its lateral and dorsal surfaces. Approximately halfway back to the radula a 

 heavy fold develops in the dorsal wall, and sections show it to be packed with 

 innumerable lobules of what probably is the dorsal salivary gland. These 

 lobules are cirrus-like masses composed of relatively small cells whose secretion 

 stains a Ught pink after treatment with haematoxyUn. Slender ductules from 

 the component cells make their way through the adjacent muscle fibres and 

 open by intercellular pores throughout the entire surface of the dorsal fold. 



The pharynx beneath the outlet of the dorsal fold is ventrally produced 



