ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 427 



belonging to the section Resorbentes ; and Forocephalus indicus sp. n., 

 a Linguatulid from the trachea and hmgs. 



Platyhelminthes. 



Taenia tenuicollis Rud.* — J. Theinemann gives a detailed acconnt 

 of this parasite, based on a study of many examples, and compares it 

 with other parasites of the Mustelids, viz., T. intermedia Rud., T. hrevi- 

 coUis^viA., and T. conocephala Dies. T. tenuicollis Rud. belongs to the 

 Cystotasniae in Leuckart's sense, and to the genus Tmnia according to 

 the newer definition, whose type is T. solium. 



New European Distomids.f — A. Looss describes from a frog at 

 Cambridge a specimen of Opisthioglyphe rastellus (Olsson), a genus 

 which he has for many years erroneously regarded as identical with 

 0. rame. Frol. An account is also given of Itijogonimus filum sp. n. 

 from the gut of Talpa europ(v,a from the neighbourhood of Leipzig ; of 

 Platynosomum semifuscnm g. et sp. n. from Circcetris gallicus at Genoa : 

 and Pachytrema calcidtis g. et sp. n. from the gall-bladder of Larus 

 ridibundus and Larus argentatus at Trieste. 



New Trematode Genus. J — W. Nicoll describes anew Parorchis 

 acanthus g. etsp. n., formerly established by him as Zeugorchis acanthus. 

 It occurs in the rectum and bursa Fabricii of gulls, Larus argentatus, 

 and Larus canus. One of the most characteristic features of this 

 Trematode is the condition of the excretory system. This consists of a 

 small median irregularly-shaped vesicle, placed posteriorly, into which 

 open two median and two lateral vessels ; the latter are divided by septa 

 into numerous lacunse, and as they pass forward branch into numerous 

 smaller vessels. 



Chromosomes in Ovum of Planaria gonocephala.§ — ^Y. Schleip 

 finds that the oogonia contain sixteen chromosomes which divide 

 longitudinally. Eight double chromosomes are formed in synapsis. In 

 the first directive spindle there are eight annular double chromosomes 

 comparable to tetrads. The first division is probably a reduction- 

 division, separating the single chromosomes united in the synapsis. 

 The second is an equation-division, in which there is longitudinal 

 cleavage of the single chromosomes. The author's results agree with 

 those reached by A. and K. E. Schreiner in regard to Myxine and 

 Spinax. 



Structure of Catenula lemnse.]] — Al, Mrazek gives an account of 

 this Turbellarian, especially as regards the excretory system, alimentary 

 system, and the parenchymatous tissue. Previous investigators seem to 

 have missed all the ahmentary system except the pharynx. In the 

 formation of the new gut of a bud, the gut of the parent plays no part. 

 The genus cannot be merged in Stenostoma ; the possession of a statocyst 

 is in itself enough to define off Catenida. 



* Arch. Natur., 1906, pp. 227-48 (1 pi.). 



t Centralbl. Bakt. Parasitenk. (1907) pp. 604-13 (4 figs.). 



X Quart. Journ. Micr. Sci., No. 202 (1907) pp. 345-55 (1 pi.). 



§ Zool. Jahrb., xxiii. (1906) pp. 357-80 (2 pis.). 



11 SB. k. Bohm. Ges., xxvii. (1906) pp. 1-8 (4 figs.). 



