550 
increase in length from one end of the worm to the other is broken 
at intervals and is not uniform as in D. latus , &c. As stated above 
the dimensions of the largest gravid segments are 5 by 3 mm. The 
uterus forms a central rosette with four to five loops on each side of 
the median line, occupying about the middle half of the length. 
In a proglottid measuring 37 by 2*25 the genital atrium is 
situated o^-o^ mm. behind the anterior margin, and the uterine 
opening is situated the same distance behind the genital atrium. 
The eggs, operculated, average 59^2 by 407//. Calcareous 
corpuscles were absent in those segments examined. 
Fig. i. Dibothriocephalus parvus 
(1) Outline of uterine rosette 
(2) Genital atiium, uterine pore and protruded cirrus 
1 he question now arises as to the identity of this worm. 
0 ) On comparing it with D. latus we see that the maximum 
width of gravid segments is 5 mm., while the minimum width of 
t,ravid segments of D. latus is 10-12 mm., and the maximum width 
20 I | mi ’ so that the worm is a very much smaller one, as is evident 
t e naked eye. I his is also shewn by the size of the quadrate 
nents which in D. latus are 6 by 6 mm., while in D. parvus they 
4 by 4 mm., and moreover the quadrate segments in D. 
