ILLUSTRATED KEY TO THE CESTODE PARASITES 
OF MAN. 
By Ch. Wardell Stiles, Ph. D., Chief of Division of Zoology, Hygienic Laboratory, 
U. S. Public Health and Marine-Hospital Service. 
INTRODUCTION. 
The present paper is intended as a companion to the “Illustrated 
Key to the Trematode Parasites of Man,' 1 Bull. 17, of this laboratory, 
and includes all of the cestodes, both adults (tapeworms) and larvte 
(bladder worms) known to occur in man. 
The more important species for American physicians are at present: 
Taenia saginata , T. solium , ITymenolepis nan a. Echinococcus , and Dibo- 
thriocephalus lotus. In addition to these, Taenia confusa may prove 
to be an important parasite, more particularly in the Northwest. It 
is a little difficult to forecast which forms will prove to be of impor- 
tance in the Philippines, but in addition to the first five species 
mentioned above, Diplogonoporus grandis and Sparganum mansoni 
should be held in mind as possibilities. 
CLINICAL CLASSIFICATION OF CESTODE INFECTIONS (TZENIASES). 
Taenia was the original (1758) genus of tapeworms, and infections 
by any member of the group may conveniently be referred to as 
taeniasis. The following clinical forms may be distinguished: 
Intestinal teeniasis: This is the more common form and includes the 
infection with adult tapeworms; diagnosis by finding the segments in 
the stools, in the bed, or in the clothes, or by finding the eggs in 
microscopic examination of the stools; treatment medicinal, by admin- 
istering tacniacides or tasniafuges (male fern, cusso, kamala, pome- 
granate, pumpkin seed, etc.) (p. 11). 
Somatic taeniasis: This includes infections of muscles, connective 
tissue, liver, lungs, brain, eye, or other organs, with the larval stage 
of tapeworms, and we may distinguish — 
(a) Cysticercosis : Infection with the larva of Taenia solium, known 
as Cysticercus cellidosse , which occurs chiefly in the muscles, 
connective tissue, eye, and brain; diagnosis by excision, 
or by ophthalmoscopic examination, or by sjunptoms, espe- 
cially when combined with a history of intestinal infection 
with Taenia solium; treatment surgical (p. 68). 
(9) 
