MEMOIRS. 
OBSERVATIONS on the ANATOMY of ‘THNIA MEDIOCANELLATA. 
By Francis H. Werticu, F.R.C.S., Surgeon, Army 
Medical Department, and Assistant to the Professor 
of Pathology, Army Medical School, Netley. (With 
Plates I & IT.) 
Ar first sight 1t may appear somewhat a work of super- 
erogation to enter upen the anatomical details of any of the 
tapeworm species, so much having been done, especially by 
German observers, all of whom appear to have taken as the 
type of the genus, and as its common representative, the 
Tenia solium. Consequently the space allotted to the Tenia 
medvocanellata in the text-books has been very meagre in 
amount, the points only in which it appeared to diverge from 
the assumed common form being entered on. None but the 
sparsest illustrations of its anatomy are in existence, and, as 
far as I am aware, no complete exposition of its structure 
from an English source is to be found. But although the 
Z. solium, as far as man is concerned as a habitat, may be 
the tapeworm more frequently observed in certain localities, 
yet, on the point of dispersion over the earth’s area the 
T. mediocanellata (as far as present knowledge extends) 
seems unquestionably in the ascendancy, and, if so, rightly 
must be considered as the more common form infecting man, 
and also regarded as the type of the genus. Indeed, even in 
these islands, where the 7. solium is supposed to predominate, 
it is difficult to come across an example of it, while on the 
other hand the 7. mediocanellata may be obtained with 
comparative facility. Owing to the difficulty of procuring 
the head for identification, there can be little doubt that 
segments of the 7. mediocanellata have often done duty in 
the eye of the observer as exemplifying the presence of its 
congener, the solitary worm; and the more the subject is 
inquired into the more dubious becomes the ordinary received 
opinion of the 7. solium being the common tapeworm even 
of the British Isles. That the 7. mediocanellata is extremely 
common in Malta and the Mediterranean generally, both 
among natives and the English garrison, I can personally 
VOL. XV.—NEW SER. A 
