72 AMERICAN NATURALIST. (VOL. XXXIIL 
only the families but the genera and subgenera within the families, 
except in the case of the Muridz, with its 200 names, which are 
alphabetized under the subfamilies. 
These three lists— Dr. Trouessart’s, Mr. Thomas’s, and Dr. 
Palmer’s — supplement each other admirably, the omissions in one 
being supplied by the other two, so that the work of the specialist 
in this group has now become greatly simplified and lightened as 
regards its nomenclatorial side. EAA 
A New Human Tapeworm.— In 1896 Prof. H. B. Ward, of the 
University of Nebraska, announced the discovery of a new human 
tapeworm, two specimens of which had been received by him from 
a Lincoln, Nebraska, physician. The new species was described as 
possessing characters in many respects intermediate between those 
of the two well-known species of Tænia found in man (Z7. saginata 
and 7: solium), and for that reason was named by Ward Zenia 
confusa. 
Only one of the two specimens received by Ward bore the scolex or 
head, which was “ remarkably small,” and unfortunately was detached 
by him for more careful study than was possible in its natural posi- 
tion. Ward’s published description and figure of this scolex, he 
admits, would answer well for that of Dipylidium, and he is not now 
himself certain that he did not confuse the scolex, in the course of its 
preparation for microscopic examination, with that of a Dipylidium. 
- That important portion, therefore, of the description of the new 
species, which concerns the scolex, must be held in abeyance until 
additional specimens are obtained. 
Michael F. Guyer, a pupil of Professor Ward, in a recently pub- 
lished paper, gives a detailed account of the anatomy of the new 
species as made out from a careful study of the specimens received 
by Ward in a headless condition and, unfortunately, none too well 
preserved. 
Guyer finds that the proglottides of the new species are about as 
numerous as those of 7. solium, but much longer and narrower, mak- 
ing its total length two or three times that of Z. solium, and about 
the same as that of 7: saginata, which, however, bears nearly twice 
as many proglottides. The branches of the uterus, one of the most 
conspicuous characters of a ripe proglottis, number from fourteen 
to twenty; in Z. solium there are from seven to ten branches, and in 
T. saginata from twenty to thirty. 
1 Zool. Jahr., Bd. xi (1898), pp. 1-24, Taf. 28. 
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