222 CHILD. [VOL. I. 



Figure 5. 



In this figure two variations from the normal form occur, 

 both cases of incomplete separation or partial division. The 

 partial segment a is completely separated on the upper surface 

 from the segment in front, and its inner end is rounded, but on 

 the lower surface the furrow between the two ends free, so that 

 the separation is incomplete here. The segments b and c are 



incompletely separated by four 

 distinct partial furrows, all of 

 which, however, lie in the same 

 transverse plane and must be 

 regarded as portions of a single 

 furrow. The largest portion is 

 at the left side, extending to 



FIG. 5. 



the middle of the body on each 



surface and of normal depth throughout. To the right of the 

 middle a short partial furrow appears on each surface, the two 

 being equal in length and in corresponding positions. At the 

 right edge is a very short partial furrow marking off the two 

 segments at the edge, but extending only a very short distance 

 on either surface. The length on the two opposite surfaces of 

 all the partial furrows, and especially of the two short entirely 

 unconnected parts, is a point of interest. It is quite commonly, 

 though by no means universally, the case that partial furrows, 

 when they occur on the two surfaces, are of the same length 

 on both. 



Figure 6. 



At the stage shown here the inter-proglottidal glands have 

 begun to appear in the furrows between the segments. This 

 case shows a rather unusual form of partial proglottid. The 

 part a is completely marked off on both dorsal and ventral sides 

 from the rest of the proglottid by the transverse furrow between 

 a and c, and by the nearly longitudinal furrow between a and b, 

 thus forming a small, distinct, partial proglottid. The transverse 

 furrow extends somewhat beyond the point where the longitudi- 

 nal line joins it, thus partially separating a small portion, b, from 



