34 
The occurrence of the large numbers in which the worm is found in 
the human intestine lie (Leuckart, 1886a: 1886b. p. 661) would explain 
as resulting from a budding of the cysticercoid in the intermediate 
host similar to that which takes place in cysticercoids {Staj>hyJocystis 
Jjilarius and 6'. raicraca'ntJius) found by Villot (1878) in certain 
myriapods. Leuckart (1886a. p. 997) also considered the possibility 
of some snail being the intermediate host of H. nana^ upon the basis 
of information that the children in the vicinity of Belgrade, where a 
case had been observed in a child (see case Xo. 6). A^ery commonly ate 
a kind of little white snail. 
Stein's cysticercoid {Cercocystis tenehrionls Villot, 1882= Cysticercus^ 
tenehrionls— Scolex decipie/is) ot the meal worm (laiwa of Tenebrio | 
m.oUior) was considered by Leuckart (1880, pp. 420, 457) the probable | 
intermediate stage of Tserua miirina Dujardin { — Hymenolepis nand). 
Villot (1882), however, looked upon this cysticercoid as belonging to 
Tsenia microstoma Dujardin. 1845. a tapeAvorm of the mouse, and 
Moniez (1888) and Linstow (in litt. ^loniez, 1888) were of the same 
opinion." Grassi (1887d) at lirst believed that this cysticercoid would i 
prove to be the intermediate stage of HymenoJeyns naiuu but later 
abandoned this hypothesis and concurred (Grassi & EoA^elli. 1889b, 
p. 371) in the opinion of Villot. iMoniez. and Linstow.^ 
Grassi and Calandruccio (Grassi, 1887h) attempted numerous times 
under A'arying conditions to infest larvae of Tenebrio molitor with eggs 
of Hymenolepis nana. but always without success. They also exam- 
ined from those localities of Lombardv and SicilA’ in which thcA’ had 
found Hymenolepis nana common in man. hundreds of specimens of 
numerous species of arthropods, molluscs, and Avornis, especially edi- ! 
ble molluscs, lice, flies, meal worms, the larvae of certain beetles living 
in beans, etc., in the hope of rinding a cysticercoid to correspond with : 
II. nana. All of these iiiA^estigations resulted negatively with the excep- 
tion that two cysticercoids were found in a meal worm. AA'hich were 
fed to a man. with negatiA^e results. It Avas during this time that 
Grassi noticed the great frequency of Hy menolepis rnurina (Dujardin) | 
in rats in Catania, where also from 250 examinations of children, rang- 
«It cannot be admitted that the cysticercus of the meal worm belongs to Txnia [ 
nana; this cysticercus possesses a crown of 30 hooks which have a length of 12//, | 
while T. nana, as well as T. rnurina, presents only 24 hooks 15 to 18 //long. In both i 
these characters, on the other hand, the cysticercus of the meal worm corresponds | 
with Tsmia niicrostorna of the mouse, with which Villot has already associated it; von 
Linstow (in litt.) is of the same opinion, with which we can only agree after having 
examined attentively the head of the cysticercus and that of the adult animal. | 
(Tran.slation of Moniez, 1888. ) 
?>The few experiments which Grassi and Rovelli performed, by feeding eggs of 
Tsenia microstoma to larvae of Tenebrio molitor, resulted negatively, and this sup- 
posed connection between the adult tapeworm and the cysticercoid in question is . 
still not definitely established. (Grassi Rovelli, 1892a, p. 78.) 
