97 
105. 107. 
Fig. 105.— View of cercocystis of R. diminuta, showing muscle fibres: caud., caudal appendage; pr. 
cav., primary cavity; sec. car., secondary cavity. Enlarged. (After Grass! & Rovelli, 1892a, pi. 4, fig. 4.) 
Fig. 106. — Longitudinal section through the body of a cercocystis of R. diminiiia: ex. can., excretory 
canal; pr. cav., primary cavity; sec. car., secondary cavity. Enlarged. (After Grass! & Rovelli, 
1892a, pi. 4, fig. 6.) 
Fig. 107. — Longitudinal section through the body of a cercocystis of R. diminuta: ac., sucker; 
pr. cav., primary cavity; sec. cav., secondary cavity. Enlarged. (After Grassi & Rovelli, 1892a, pi. 4, 
fig. 5.) 
Cysticercoids, single or proliferated, were often found dead, having' 
undergone a degeneration by which they became brown, and the 
details of structure indistinct. In some cases, in Acis spinosa^ the 
adventitious capsule was present and very thick; live cysticercoids were 
found encapsulated in AiiholaTju. 
In a footnote (Grassi & Rovelli, 1892a. p. 33) it is stated that more 
recently a stage in the development of the C3'sticercoid was found 
which showed that in II. diminuta the formation of the rostellum and 
suckers precedes the invagination as in Ilymenolepis nana. 
19203— Xo. 18—04 7 
Theembrvonal hooks are frequentG evident, commonlv four upon the 
tail and two upon the most posterior part of the bodv proper (tig. 105). 
Since the tail was sometimes found branched and at other times (in 
Anisolahis) the cvsticercoids were united b}^ their tails into groups of 
3 or I, and since occasional!}' in Acis spinosa a smaller cysticercoid 
would be found attached by the tip of the tail to the thickest part of 
the tail of a cysticercoid of ordinaiy size, it seemed probable to Grassi 
that in certain cases the cysticercoid of II. diminuta is capable of 
proliferation. 
106. 
