ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
745 
Dr. Linstow has made the private suggestion that this cysticercus is 
that of T. constricta, but the author does not accept the suggestion. 
Herr Mrazek has observed that the hooks are not developed till a 
comparatively late period, and he suggests that this is why the scolex is 
able in earlier stages to freely extend and invaginate itself ; an analogous 
phenomenon is to be observed in Arcliigetes Sieboldi. The well-marked 
development of the caudal appendage in all the cysticerci observed by the 
author in freshwater Crustacea is due, he suggests, to the intermediate 
hosts being animals which are, pliylogenetically, very old. 
Taenia coronula.* * * § — Mr. T. B. Rossiter has a note on this tapeworm, 
the cysticercus of which he was recently able to show inhabited Cypris 
cinerea. 
Echinococcus multilocularis in the Cow-t — Prof. A. Guillebeau 
reports the tenth case of the presence of Echinococcus multilocularis in 
an old cow ; it did not seem to give rise to any disturbances, but the 
tumour taken from the hepatic capsule was an oval 9 by 13 cm. and 
5 cm. thick. No cestode heads were found. The vesicles were sur- 
rounded by a layer of giant-cells, but these were in some parts replaced 
by large spindle-cells. 
Cysticercus of Taenia saginata in the Cow.f — Comparatively com- 
mon as Taenia saginata is in Man, its cysticercus is only rarely found in 
the Ox. Prof. A. Guillebeau takes, therefore, the opportunity of making 
a few observations of a case in which a large number of this cysticercus 
were found in the flesh of a calf three weeks old. It has the form of a 
yellowish- white oviform nodule, 6 mm. long by 4 mm. broad. 
8. Incertse Sedis. 
Desiccation of Rotifers.§ — Dr. R. Cobellf has desiccated Rotifers for 
five years and five months in the powdery dust of the gutter. There- 
after they were quite dead ! But after immersion in water for 3-7 days 
the bodies were beautifully distended, and the internal organs were 
distinctly seen in a state of good preservation. 
Determination of Sexes of Hydatina senta.|| — M. Maupas has made 
some experiments on the ova of this rotifer, with the object of seeing if 
he can determine the sex of its developed form. He finds that at the 
beginning of oogenesis the egg is neutral, and that temperature is a 
modifying agent. If the temperature is lowered females will be 
produced, if it is raised males will appear. 
Distyla; New Rotifers.^I — Mr. D. Bryce has some observations 
in support of the view already expressed in this Journal that Distyla 
and Cathypna are distinct genera;** he describes two new species, 
D. depressa from the River Lea and D. muscicola ff from among roots of 
Sphagnum in Epping Forest, and Monostyla arcuata, also from the Forest. 
* Intern. Journal Micr. and Nat. Sci., i. (1891) pp. 291-5 (1 pi.). 
f Mittheil. Naturf. Ges. Bern, 1890 (1891) pp. 7-11 (3 figs.). 
t Tom. cit., pp. 12-15 (1 fig.). 
§ Verh. K. K. Zool.-Bot. Gesell., xli. (1891) pp. 585-6. 
|| Comptes Bendus, cxiii. (1891) pp. 388-90. 
Tl Sci. Gossip, 1891, pp. 204-7 (8 figs.), 
ft Not musicola as in original ( teste auct. in litt.). 
1891. 
1890, p. 726. 
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