34 
The occurrence of the large numbers in which the worm is found in 
the human intestine lie (Leuckart. lS86a: 18S6b. p. 661) would explain 
as resulting from a budding of the cysticercoid in the intermediate 
host similar to that which takes place in cysticercoids {Staphylocysfis 
hUariv.s and -S', ink'raca-nthus) 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 Belo-rade. where a 
case had been observed in a child (see case Xo. 6). very commonly ate 
a kind of little white snail. 
Stein's cysticercoid {Ce'pcoeyst is tenehnonis Yillot. 1882= Cysiicercus^ 
tmehrionis= Scolex deeipiens) ot the meal worm (larva of Tenebrio 
rnoJiior) was considered by Leuckart (1880. pp. 420. 457) the probable 
intermediate stage of Teenia mv.rina Lujardin {= HymenoJepis nanci). 
ATllot (1882). however, looked upon this cysticercoid as belonging to 
Txnia mkrostoma Dujardin. 1845. a tapeworm of the mouse, and 
Moniez (1888) and Linstow (in litt. ^loniez. 1888) were of the same 
opinion.^ Grassi (188 7d) at hrst believed that this cysticercoid would 
prove to be the intermediate stage of Ilymenoleyns nana. but later 
abandoned this hypothesis and concurred (Grassi i!c Rovelli. 1889b. 
p. 371) in the opinion of Villot. Moniez. and Linstow.^ 
Grassi and Calandruccio (Grassi. 1887h) attempted numerous times 
under varvino- conditions to infest larv^ of Tenebrio rnoUfor with eo-o*s 
of Ilyrnenolepis nana. but always without success. They also exam- 
ined from those localities of Lombardy and Sicih' in which they had 
found IIymenoIej)is nana common in man. hundreds of specimens of 
numerous species of arthropods, molluscs, and worms, especially edi- 
ble molluscs, lice, flies, meal worms, the larva? of certain beetles livings 
in benns. etc., in the hope of flnding a cysticercoid to correspond with 
IL nana. All of these investigations resulted negatively with the excep- 
tion that two cysticercoids were found in a meal worm, which were 
fed to a man. with negative results. It was during this time that 
Grassi noticed the great frequency of Hymenolepis raurina (Dnjardin) 
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 Taenia 
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 
these characters, on the other hand, the cysticercus of the meal worm corresj3onds 
with Tsenia microstoma of the mouse, with which Villot has already associated it; von 
Linstow t in litt. i is of the same opinion, with which we can only agree after hawng 
examined attentively the head of the cysticercus and that of the adult animal. 
; Translation of 3Ioniez, 1888. ) 
f'The few experiments which Grassi and Eovelli performed, by feeding eggs of 
Tienia microstoma to larv'te of Tenehrio rnoUtor, resulted negatively, and this sup- 
posed connection between the adult'tapeworm and the cysticercoid in question is 
still not definitely established. Grassi ck Rovelli, 1892a, p. 78.) 
