140 



son to the size oi the body, and is conspicuous in sections. The body 

 of the bulb is composed of three kinds of cells. The first kind forms 

 a series in which the cells are arranged radially around the penial 

 lumen for its entire length. They are uniform in character and have 

 but a slight staining reaction. The nuclei lie at the bases of the cells 

 and are so regular in their distribution that they appear as a distinct 

 row in sections. The cells of the second kind occupy the dorsal per- 

 ipheral part of the bulb. They are fusiform, and arranged in such a 

 way that the oval nuclei appear somewhat scattered. These cells are 

 so placed that their long axes point towards the penial lumen. They 

 stain deeply, and have the general appearance of gland cells. The 

 third series of cells occupies the ventral ectal part of the bulb, lying 

 between the inner bulb cells and the ventral periphery. They are much 

 larger than the other kinds of cells and their boundaries are less 

 strongly marked. Their contents as indicated by the staining reaction 

 are quite distinct from the other cells, being less dense and taking the 

 stain sparingly. The sperm duct enters the bulb on the ectal side not 

 far from the lowest point of the penial invagination. It penetrates 

 the bulb and meets the penial lumen at a point about half way between 

 the dorsal periphery and the penial pore. The penial lumen curves 

 laterad and meets the penial invagination in the upper half of its 

 length. The cuticula which lines the invagination is also continued 

 into the penial lumen as a lining. The bulb is covered by a muscu- 

 lature which is a continuation of the circular muscle layer of the body 

 wall. From the inner extremity of the penial invagination a muscular 

 strand extends diagonally dorsad and soon unites with the muscle 

 layer of the body wall. The transition from clitellar cells to the bulb 

 cells is very abrupt. 



Ovai'ics. — The ovaries are massive, extending dorsad around the 

 digestive tract. Egg masses are present in the coelom, and the type 

 specimen appears to be at the height of sexual maturity. 



Spcriuatheccc. — A pair of these organs lie in V. The ectal open- 

 ing of each is laterad and in the intersegmental groove IV/V, where 

 it is surrounded by a rosette of glands (PI. XII, Fig. 57). The di- 

 ameter of each organ is greatest near the ectal opening, and from 

 thence entad the diameter is reduced and becomes nearly uniform for 

 the greater part of its length. There is no well-developed ampulla, 

 and the spermatozoa are present all along the lumen. The spermatheca 

 extends obliquely across the coelom to the digestive tract, where it 

 bends caudad. In the anterior part of V the two spermathec?e unite 

 to form a single common lumen (PI. XII, Fig. 57) through which 

 both communicate with the digestive tract. This communication is 

 not mid-dorsal as is usually the case, but is latero-dorsad in position. 



