80 
Tcenia dimimita'R. n. sp. — Txnia: Head obconical ; neck Ions:, slender; anterior seg- 
ments very short; the rest, suhcuneate, obtuse. 
Habitat. — Collected by Olfers in Brazil from the intestines of a gravid rat {Hus 
rattiis). Specimens 6 to 9 inches or more in length, and, since the measurements 
.were taken from fragments, perhaps longer. Head obconical, with rather large 
suckers situated anteriorly; it is similar to that of T. omphalodes (described, Mantissa 
[Rudolphi, 1819], p. 491), but much smaller, for which reason I have chosen the 
specific name Idiminuta']. Xeck long and slender. Segments at first resembling cor- 
rugations, gradually becoming larger, with their length always remaining less than 
their width, with obtuse angles; posterior segments more or less variable, but short. 
Eggs subglobose, of medium size. 
Note. — I would have said it were omphalodes if the head were not much smaller 
and the eggs larger; the contention might be made that the eggs of omphalodes could 
grow larger; a head, however, will not increase in size. (Translation). 
Some years later Creplin (1825a, pp. T1-T2) described as a new spe- 
cies a tapeworm from the rat which he named T^nia leptocephala. 
The following is translated from his description:" 
Taenia: Head slender; suckers large, globose; rostellum, conical, truncated, 
unarmed; neck, continuous, elongated; segments all short. 
Habitat. — I once collected, April 19, 1822, two specimens of this tapeworm in the 
intestines of a mouse {Hus musculus). Of these I took out only one with a head, and 
u fragment of the posterior part of the body. 
I am compelled to give a description from these specimens as already preserved 
for some time in alcohol, since I did not have time to examine them when they 
were fresh. 
The length of the worm with the head equals 10 to 11 inches; of the other without 
a head about 9. The width, decreasing from the tail toward the head, measures a 
little more than a line at its maximum in the posterior part of the body. Color 
white. 
Head small, slender, furnished with large globose suckers, which when projecting 
have orbicular apertures, likewise large, and with a rostellum, conical, truncated, 
and unarmed. With the suckers withdrawn the length of the head equals its 
thickness at the base. Xeck rather long, slender, continuous with the head, flat- 
tened. Anterior segments resembling corrugations; following segments very short, 
a T. capite tenui, osculis maximis globosis, rostello conico truncato inernii, collo 
continuo elongato, articulis omnibus brevibus. 
Hab. Semel (d. 19. Apr. 1822) in int. Huris musculi offendi hujus Tgeniye duo 
specimina, quorum alterum solum cum capite extraxi, et fragmentum corporis 
postici. 
Descriptionem dare coactus sum de speciminibus illis jam per quoddam tempus in 
^piritu vini servatis, cum recentiuni examinandorum tempus deficeret. 
Longitudo A'ermis capite adhuc gaudentis sequat decern ad undecim pollices, alte- 
rius capite privi novem circiter. Latitudo, a cauda ad caput semper decrescens, 
maxima, postica in parte lineam parum excedit. Color albus. 
Caput parvum, tenue, mculis vero magnis, globosis, apertura orbiculari pariter 
magna, exstantibus, et rostello caput ipsum longitudine et basi sua etiam crassitie 
(osculis deductis) jequante, conico, truncato, inermi instructum. Collum satis 
longum, subtile, cum capite continuum, planum. Articuli antici rugaeformes, 
sequentes brevissimi, marginibus lateralibus obtusis, reliqui omnes, semper breves, 
anticam partem paululum contractam, margines laterales interdum convexiusculos, 
interdum fere rectos, marginem posteriorem vero tumidulum exhibent. Eltimi 
-articuli non adsimt. Foramina articulorum non vidi. 
