17 
crown of bifid hooks. Segments broader than long, cirri situated all on one and same 
margin. Eggs globose, furnished with a single thin shell. Length, 6 lines. 
Native country, Egypt; collected once in large numbers from the small intestine 
of man. (Translation). 
Leuckart (1863) added to this brief account by a stud}- of some of 
the original specimens, and more 
recently our knowledge of the anat- 
omy has been further increased by 
Blanchard (1886a, e, f, 1891 aj, 
Grass! & Calandruccio (1887a), Mer- 
tens (1892), and a number of other 
obseryers. 
Some 3 "ears earlier than the first 
report of Ilymenolepis nana in man, 
Dujardin (1815a, pp. 561-565, pi. 
12, fig. A) reported from the rat, 
2fiis decumamis^ a new tapeworm, 
Tsenia murina (not Tdenia muydna 
Gmelin, 1790= Cysticercus fascio- 
laris Rudolphi, 1810), which seems 
in all respects to be identical with 
Ilymenolepis nana^ and is so con- 
sidered by Grass!, Lutz (1891), 
Mingazzini (1898), Massari (1898), 
and others. The following is a trans- 
lation of Dujardin’s description; 
Tsenia mwnna Dujardin, nor. spJ^ — Twenty-five mm. long, from 0.55 mm. to 0.9 mm. 
broad, composed of very numerous segments, four to eight times as broad as they are 
long; head 0.32 mm. broad, with a short thick rostellum surrounded by a simple crown 
of twenty to twenty-four hooks from 0.015 mm. to 0.017 mm. long; suckers 0.08 
mm. broad; neck 0.15 mm. broad; i rst segments very short; the following (male) 
0.07 mm. long, from 0.55 mm. to 0.6 mm. broad; the last filled with ripe eggs from 
« Tenia murin ( Tsenia murina Duj., nov. sp.) . — Long de 25 mm., large de 0 mm. 55 
a 0 mm. 9, forme d’ articles tres nombreux, quatre a huit fois aussi larges que longs; 
tete large de Oipm. 32, avec une trompe courte, epaisse, entouree d’une couronne simple 
de vingt a vingt-quatre crochets longs de 0 mm. 015 a 0 mm. 017; ventouses larges de 
0 mm. 08; cou large de 0 mm. 15; premiers articles tres courts; les suivants (males) 
longs de 0 mm. 07, larges de 0 mm. 55 a 0 mm. 6; les derniers remplis d’oeufs murs longs 
de 0 mm. 15 a 0 mm. 17, larges de 0 mm. 8 a 0 mm. 9; tons les articles ayant leurs angles 
posterieurs un peu saillants, aigus, en dents de scie; orifices genitaux unilateraux; 
testicule claviforme, etendu transversalement depuis le milieu jusqu’au receptacle du 
penis en forme de cornue; penis lisse, tres grele, peu saillant; ceufs elliptiques a 
trois enveloppes; I’externe longue de 0 mm. 065; la moyenne membraneuse, plissee, 
longue de 0 mm. 01; I’interne j^lus resistante, un peu oblongue et terminee par une 
pointe obtuse a chaque extremite; embryon long de 0 mm. 029 a 0 mm. 030, avec les 
crochets de 0 mm. 015 a 0 mm. 016. 
Je I’ai trouve, a Rennes, dans un surmulot {Mus decumanus) , dans un mulot nain 
{Muspumilus) [=M. minutus'], et dans un lerot {Myoxus niteJa) \_—Eliomysquercinus']. 
19203— No. 18—04 2 
Fig. 5.— Head and strobila of H. nana. A, 
natural size; B, enlarged. (After Stein, 1882, 
pi. 12, figs. 9-10.) 
