no 
ing- infected Crustacea, and the dehnitive stage may then he developed. 
Although certainly very unusual, it appears that development of the 
adult following the ingestion of the intermediate stage ma}" occur 
also in the human intestine. 
ABSTRACT OF CASE OF HYMEXOEEPIS EAXCEOEATA IX 
MAX. 
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 CBloch) . 
COMPEXOIUM OF THE THREE PARASITES, II. XAXA, H. 
HIMIXUTA, AXH II. EAXCEOEATA, ARRAXGEH ACCORD- 
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 Intestine. 
Hymenolepis nana : ? Bladder (p. 56). 
* Hymenolepis diminuta Intestine. 
Hymenolepis lanceolaia 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 diminuta Intestine. 
a The names used for the rodents in this list are those given by Trouessart, 1889-1898, Catalogus 
mammalium tarn viventium quam fossilium. Nova editio (prima completa). 8°. Berlin. 
