no 
ing infected Crustacea, and the definitive stage may then be developed. 
Although certain!}^ ver}" unusual, it appears that development of the 
adult following the ingestion of the intermediate stage may occur 
also in the human intestine. 
ABSTRACT OF CASE OF HY:MEX0EEPIS EAXCEOEATA IX 
3IAX. 
Breslau, Germany, 1902 1 case. 
This unique case has been reported by Zschokke (1902a, b) , who received two 
tapeworms for determination which had been passed spontaneously, at two different 
times, by a 12-year-old boy at Breslau. The heads were lacking in both specimens, 
but a careful anatomical study left no doubt as to their identity with Hymenolepis 
lanceolata ( Bloch) . 
COMPEXOIUM OF THE THREE PARASITES, H. XAXA, II. 
HIMIXUTA, AXH II. EAXCEOEATA, ARRAXGEH ACCORH- 
IXG TO THEIR HOSTS. 
In the following compendium all the hosts reported for any of the 
three tapeworms discussed in this paper are included. 
(") Signifies that I have examined specimens of the parasite from the 
host in question. 
(?) Signifies that the correctness of the determination is considered 
doubtful. 
Class MAMMALIA — Mammals. 
Order PRIMATES. 
HOMO SAPIENS— Man. 
* Hymenolepis nana 
Hymenolepis nana 
* Hymenolepis diminuta 
Hymenolepis lanceolata 
Intestine. 
? Bladder (p. 56). 
Intestine. 
Intestine. 
Order RODENTIA — Rodents. 
MUS DECUMANUS^' — Brown or Norway rat. 
^Hymenolepis nana Intestine. 
* Hymenolepis diminuta Intestine. 
MUS RATTUS ALEXANDRINUS— Egyptian or roof rat. 
Hymenolepis diminuta Intestine. 
MUS RATTUS— Black rat. 
Hymenolepis nana Intestine. 
Hymenolepis dimmuta Intestine. 
rtThe names used for the rodents in this list are those given by Trouessart, 1889-1898, Catalogus 
mammalium tarn viventium quam fossilium. Nova editio (prima eompleta). 8°. Berlin. 
