4 EISEN 



sperm-ducts. Typical accessory glands are found in Mesenchytrceus 

 franciscanus, M. pedatus, and M. solifugus. 



Ampulla. The distal, generally inflated part of the spermatheca. 

 The ampullar part is often furnished with diverticles at its base, these 

 diverticles resembling the ampulla in structure, but differing from the 

 duct of the spermatheca. 



Atrium. That enlargement of the sperm-duct situated in the 

 coelomic cavity immediately adjoining the penial bulb. Sometimes 

 there are two more or less similar enlargements. In such cases the 

 upper enlargement is named atrium, while the lower one, closer to 

 the pore, and which is generally situated inside the penial bulb, is 

 designated ' penial chamber.' 



Atrial glands. Glands which are situated free in the coelomic 

 cavity and which open into the atrium. The ducts of these glands 

 may open between the inner epithelial cells in the atrium, or they may 

 run down in the atrium and open at the base of the sperm-ducts. The 

 atrial glands are also known as prostates. 



Cardiac gland. The inner glandular structures in the dorsal ves- 

 sel (Herzkorper of Michaelsen) . 



Chylus cells. Large intestinal cells perforated longitudinally by a 

 canal. These cells are found only in a few genera, and generally 

 alternate with common epithelial cells in the intestine. Their form 

 and location are characteristic of the species. Generally located in 

 the vicinity of the clitellar somites. 



Copulatory papillae. The exterior penial papillae situated close 

 to or surrounding the spermi ducal pores. Protuberances serving as 

 exterior copulatory organs. 



Cyanophil lymphocytes. Lymphocytes which when double-stained 

 take the blue anilin stains. 



Eosinophil lymphocytes. Lymphocytes which when double- 

 stained take the red eosin stain. 



Intra-penial glands. Glands which are situated inside the penial 

 part of the sperm-duct. These glands are enclosed by the penial 

 envelope and open at the lower apex of the penis, but always inside, 

 never outside the penis. Typical in Mesenchytrceus harrimani. 



Penial bulb. The bulbous muscular and glandular structure situated 

 at the base of the sperm-duct in Mesenchy 'trainee an&jLumbrictllince. 

 The structure of the bulb is of importance in characterizing the species. 

 Penial papillce . Smaller or larger papillae consisting of unicellu- 

 lar glands situated inside the body in the vicinity of the spermiducal 

 pores. Found only, so far as known, in Enchytrceince. Possibly 



