ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 421 



extract of tape-worms from carnivores seemed more virulent than that 

 of tape-worms from herbivores ; that of Echinorhynchus was almost as 

 effective as that of tape-worms from herbivores ; that of Ascaris lumbri- 

 ■coides was less potent. In some cases paralysis and even death followed 

 the injection. 



Histolysis and Histogenesis in Cercarise.* — C. Vaney and A. Coute 

 describe these processes in the development of two tailed cercariee from 

 Helix pomatia and other species, and in the cercaria of Distomum 

 leptostomum Olsson from H. aspersa. The destruction of cells and nuclei 

 and the formation of a ventral plate (which gives rise to all the organs) 

 recall the histolysis and imaginal discs in the pupation of insects, 

 but there is no trace of any phagocytosis. 



Structure of Dicranotsenia coronula.| — Mr. T. B. Rosseter has 

 found this parasite in the alimentary canal of the domesticated duck, 

 where it occurs in the intestine near the rectum, and not in the 

 duodenum, as is the case with most tape-worms. He describes the 

 male and female genital organs, and finds that the cirrus is smooth, not 

 spinous, as Dujardin stated, but has a spinous sheath. In regard to the 

 female organs, he amplifies considerably Dnjardin's brief description. 



Trematodes from Bursa Fabricii, Oviduct, and Eggs of Birds.:}: — 

 Prof. M. Braun discusses five species of Prosthogonimus which have this 

 habitat. The genus, as revised, includes Distomum ovatum Eud., Dist. 

 pellucidum v. Linst., and Prymnoprion anceps Looss. The new species 

 noted are Prosthogonimus japonicus from a hen's egg, and Pr. varus from 

 the bursa of coot and duck. 



Monostomum orbiculare. § — M. Ltihe discusses this species, which 

 Rudolphi found in the gut of Box salpa. Its name, it seems, must be 

 •changed to Mesometra orbicularis, and beside it must be placed M. 

 brachyecelia sp. n., which Parona found, but did not distinguish from its 

 ally. Closely allied is Monostomum spiuosissimum-Stossichianum, also 

 from Box salpa. 



New Species of Temnocephalese. || — Prof. W. A. Haswell describes 

 three new species of Temnocephala, and discusses some points at issue 

 between himself and Monticelli ^[ in regard to the structure of the 

 genus. 



Gyrator reticulatus Sekera. ** — O. Fuhrmann believes that the 

 specimen upon which Sekera's description of this new form was 

 founded, was merely a specimen of his Macrorhynchus cosruleus. The 

 structure described by Sekera as the unpaired testis is the vesicula 

 seminalis, which is completely separated from the vesicula granulorum — 

 a character which at once places the animal in the genus Macrorhynchus. 

 Sekera apparently missed the two laterally placed testes and the two 

 minute ovaries. 



* Comptes Rendus, exxxii. (1901) pp. 1062-4. 

 t Journ. Quek. Micr. Club, vii. (1900) pp. 355-70 (2 pis.). 

 X Centralbl. Bakt., xxix. (1901) pp. 12-19 (4 figs.). 

 § Tom. cit., pp. 49-f>0 (5 figs.). 



II Proc. Linn. Soc. N. S. Wales, xxv. (1900) pp. 430-5 (1 pi.). 

 f Boll. Soc. Nat. Napoli. xii. (1898). 

 ** Zool. Anzeig., xxiv. (1901) pp. 177-8. CI', this Journal, ante, p. 280. 



