BOLBELLA 



309 



dozen very long and very slender cervical setae, those toward the head end 

 being nearly twice as long as the cephalic setae, more of them than are shown 

 in the illustration. Glandular tissue exists in the oesophagus, the granular 

 branches of which may be seen more particularly between the oesophageal bulbs: 

 a duct appears to lead to the pharynx. A cross-section of the intestine would 

 present four to six cells. In the female, from the more or less continuous anus, 

 of which, however, the posterior lip is slightly elevated, the inconspicuous rec- 

 tum extends inward a distance equal to the anal body-diameter. A narrow ren- 

 ette cell exists two to three body widths behind the cardia on the ventral side. 

 The slightly elevated vulva is of medium size, and leads to a large tubular vagina, 

 at first at right angles to the ventral surface and then leading obliquely forward. 

 The wall of the vagina is well cutinized. Each branch of the two-horned uterus 

 is about one and one-half times as long as the body is wide. Two eggs have 

 been seen in a uterus at one time, each about twice as long as the body is wide. 

 The spherical spermatozoa existing in the uterus are about one-sixteenth as wide 

 as the body. The broad, more or less cylindroid ovaries extend two-fifths the 

 way back to the vulva, and contain eight to ten countable ova arranged for the 

 most part irregularly. The two supplementary organs of Bolbella, like the simi- 

 lar organs of Eurystoma, are connected with large glands, one to each supple- 

 ment. One of these glands is very well shown in the illustration at gl sup cf. 



ait lumoe 



FIG. 90. Bolbella tenuidens. 

 Details of the pharynx are 

 shown X 1500 on the following 

 There are other species 

 of Bolbella. 



dctm 



x225 



dctq 

 mi copmsc thtglsup 



The gland is long and unicellular and its nucleus is shown at ncl gl. A natural 

 supposition is that these two supplements are cup-shaped organs attachable by 

 suction. The supposition appears, at first thought, to find support in the exis- 

 tence of the "anchors," which are manipulated by special muscles. It is rather 

 difficult to harmonize this theory with the existence of such large glands, so 

 much so that one feels inclined to give up all idea that suction plays any part 

 in the functioning of these organs. The so-called cups of the supplements are 



