ON A NEAV HUMAN TAPE-WORM (BOTHKIOCEPHALUS SP.)- 375 



1*8 the extreme shortness aiid coiisequeiit narrowness in antero-posterior 

 direction, of the ja-oi-lottides. They almost [)resent the appearance of 

 closely set transverse AvrinkJes to the naked eye (ride figs. 1 and 2, 

 PL XVIII).' In the middle and hind regions, the length of the pro- 

 glottides averaged only 0.15 nnn., and their breadth 14-16 mm. 

 Even where most distended (l)readth 10 mm.), their length did not 

 exceed 0.(S mm. The average length given above was calculated by 

 counting /ro;;i tlw outside the number of [»roglottides within a measured 

 space aloiuj tlw median line. It is important to note here that 

 wliat appeared externally to be two distinct and C(nisecutive pro- 

 glottides as indicated by the usual boundaries, very often proved to be 

 one internally, i. e. with respect to certain genital arrangements. 

 For instance, a piece oO mm. long from sample No. I, showed but 57 

 uteri in a series, while the number of proglottides as coLuited in the 

 way mentioned amounted to about 6H. Besides the superficial super- 

 numerarv boundaries, both dorsal and ventral, that extend throuofhout 

 the entire breadth of the body, others which disappear at the middle of 

 it after runnino- for a greater ov less distance from the marg-in, are of 

 (juite frequent occurrence; so that, counting the proglottides by the 

 marginal serration wc^ald give a still greater numl)er than when 

 connted along the median region. Thus, in the j)iece above referred 

 to, the number of segments as counted ne^r the margin amounted to 

 Do or thereabout. The proglottis that has sucli an incomplete 

 supernumerary boundary on the one side generally shows the same also 

 on the other. Sometimes such a false proglottidal boiuidary in its course 

 joins a neighbouring true one or loses itself on the general surface to 

 appear again after a short interruption. In rare instances, apparently 

 two incomplete filse boundaries in succession were interposed between 

 two true ones in the marginal region. The antero-posterior lengtlis 

 of consecutive segments, separated by false proglottidal boundaries 



