No. 393] REVIEWS OF RECENT LITERATURE. 745 
distinguishable, intermediate forms occur, The more delicate type 
is well supplied with tactile hairs. 
The author believes the delicate type of chela to be the more 
primitive of the two. He rejects the explanation that it is a cutting 
jaw as contrasted with a crushing jaw, and believes that it represents 
an ornamental structure. The rhythmical arrangement of its teeth is 
dwelt upon, and he suggests that as a crustacean’s eye plays over 
such a series it may receive agreeable impressions. The paper is ° 
well written in that the observational and theoretic parts are clearly 
separated. G.H. P 
Cestodes of Aplacentalia. — Zschokke has just published? a most 
important article on the anoplocephaline cestodes, the immediate 
occasion of which was the examination of material brought from 
* Celebes by the Sarasins. The specimens, fortunately well preserved, 
were taken from Phalanger ursinus, and represented two closely 
allied species of the genus Bertia. They proved to be new and 
were named B. edulis and B. sarasinorum. Regarding the specific 
name, edulis, Zschokke says that according to the report of the 
Sarasins, who obtained repeated and unimpeachable evidence of the 
fact, the tapeworms of Phalanger are hunted and eaten with gusto by 
the natives of Celebes. “ Phalanger appears, by virtue of its parasites, 
to be subjected to more than one disadvantage !” 
The anatomical structure of the two species is treated in detail. 
B. edulis is a large form, 660 mm. long with 1500 proglottids; B. 
sarasinorum has, on the contrary, a maximum length of 7o mm., with 
only 220 proglottids. Further differences are found in the manner 
of union of the excretory loops in the scolex, in the number, size, 
and arrangement of the sexual organs, and in many minor points, so 
that despite their similarity the two are undoubtedly good species. 
Closely related to them is Zenia obesa from Phascolarctus cinereus, 
while somewhat similar are 7: echidne from Echidna hystrix, and T. 
semoni from Perameles obesula. Information on all of these forms 
comes from previous studies by Zschokke.? 7: festiva, described in 
1819 by Rudolphi from Macroperus giganteus, is undoubtedly an 
anoplocephaline form, probably of the genus Moniezia; it is only 
imperfectly known. 
1 Zschokke, F. Neue Studien an Cestoden aplacentaler Säugethiere, Zeit- 
"i $ wiss. Zool., Bd. \xv, 3, pp- 404-445, Pls. xx, xxi, 1899. 
e Cestoden der Marsupialia und Monotremata, ponies Zool. Forschungs- 
reisen, ig tore Denkschriften, Bd. viii, 1898. 
