82 
Under this name, given by M. Creplin to an incompletely described tapeworm, I 
include several tapeworms which will perhaps have to be subdivided into two or 
three species, namely: First, a tapeworm 520 mm. long, 
4 mm. broad in the posterior portion, with a head 0.285 
mm. [broad], found in a rat {Mas rattus) at Eennes; its 
penes, or lemnisci, are 0.019 mm. broad, projecting 0.06 
mm. ; its testicles [probably misinterpretation of seminal 
vesicle and receptacle] are flexuous and not conglobate, 
and do not project beyond the middle of each segment; the 
external envelope of its eggs is elliptical, from 0.066 mm. 
to 0.074 mm. long; second, several tapeworms found at 
Rennes in brown rats (Miis decumaniis) with a head from 
0.24 mm. to 0.26 mm. broad, the penis not very salient, 0.016 
mm. broad, and the testicles [probably misinterpretation 
of seminal vesicle and receptacle] folded and conglobate, 
throughout almost the whole breadth of the male segments; 
the eggs, almost globular, are 0.068 mm. long; third, frag- 
ments of tapeworm from 100 to 200 mm. long, coming from 
another brown rat, and remarkable because of their very 
long filiform penis, 0.028 mm. broad; the last segments, 2.2 
Tig. 68.— Strobila of H. dimi- 
nuta. Natural size. (After 
Weinland, 1861, pi. 4, fig. 10, 
from Leuckart, 1863, p. 398, 
fig. 116.) 
0.068 mm. broad; fourth, tapeworms more than 150 mm. 
long, without a head, found in two field mice {Mus sylvati- 
cus) at Rennes; they are 0.7 mm. broad in the anterior por- 
tion and from 4.5 mm. to 5 mm. in the posterior portion, 
where the last segments, filled with eggs, are ten to fifteen 
times as broad as long, the receptacle of the penis in these intermediate male seg- 
ments is club-shaped; these segments send out very long filiform spermatozoa, but I 
did not see a salient penis; the eggs are globular, from 
0.062 mm. to 0.07 mm. broad, but more commonly 0.065 
mm. broad; their shell is granular (see Atlas, pi. 12). I 
think we should refer to the same species that which 
Rudolphi calls Tsenia diminuta. (Translation.) 
Weinland (1858) was the first to report the 
occurrence of Hy?ne?iolepis di?nimita m msLi\\ he 
described it as a new species, Hymenolepis 
flavopunctata^ in the following words (see also 
p. 98): 
The length of the whole worm is between 200 and 300 
mm., that is, from 8 to 12 inches. There were pieces of 50 
mm. in length, consisting of very young joints, only one- 
fifth mm. long and 1 to I 5 mm. broad; again, other pieces, 
about 100 mm. long, consisting in their anterior half of 
white, immature joints, one-third to one-half mm. long, 
and Ij to 2 mm. broad, while the mature joints of the poste- 
rior half, which are of a grayish tint (produced by the eggs 
which they contain), average 1 mm. in length and 1 J to 2 
in breadth. In the young joints the sides form straight 
lines, the transverse diameter being equal throughout the 
joint; in the riper ones they are round and bulged, and the transverse diameter 
is the greatest in the midst of each joint. One of the pieces, which is especially 
mentioned in the catalogue of Pr. J. B. S. Jackson, shows the form of the joints 
when fully matured and soon to be freed as proglottides. They are in this specimen 
Fig. 69.— Strobila of H. dimi- 
nuta. Natural size. (After 
E. Parona, 1884, fig. 1.) 
