ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 723 



Spadrfla includes the most primitive Cfesetognaths. Some account of 

 the minute structure is given. The author is entirely opposed to 

 Giinther's attempt to link Chsetognatha and Molluscs, and also to the 

 view that they have affinities with Nematodes. He regards them as re- 

 lated to Annelids. 



Chtetognatha of Pacific-Boreal Sub-region.* — P. Galzou describes 

 Sagitta laevis sp. n., S. longkauda sp. n., 8. japonim sp. n., S. elegans 

 Verrill, S. glacialis Moltsch, and a doubtful S. flaccida Conant ( = S. 

 inflate/, ( Jrassi ?). In a detailed table he compares all the known species. 



Nematohelminthes. 



Chromosome Differentiation in Ascaris megalocephala.f — John 

 H. Schaffuer corroborates Montgomery's results as to the definite in- 

 dividuality of the chromosomes in the ova of this Nematode. Thus, in 

 the first two cleavage divisions, the chromosomes appeared as two longer 

 and two shorter bodies, and there is a rather constant difference between 

 the pair of smaller chromosomes, one of which is now known to be a 

 maternal, and the other a paternal chromosome. 



New Filaria in a Lemur. £ — C. Mathis and M. Leger 'describe 

 Filaria sergmti sp. n. from Nyctkebus tardigradus. Adult males and 

 females were found in the walls of the peritoneal cavity and on the 

 mesentery. The embryos are sanguicolous. 



Eustrongylides and Hystrichis.§ — L. A. Jagerskiold discusses and 

 revises these two genera, which are represented by numerous species 

 parasitic in birds. Four new species of Eustrongylides and three of 

 Hystrichis are described. 



Platyhelmintiies. 



Entozoa of British Fishes. || — W. Nicoll continues his studies on 

 the parasites of British fishes. He gives a useful list of fishes, with 

 the entozoa they contain, and with an indication of the part infected and 

 the number present in one fish. He deals in particular with Podocotyle 

 atomon Rud., Lebouria alacris Lss., Dihemistephanns lydise Stoss., Zon- 

 gonus rubellus Olsson. Lecithaster gibbosus Rud., and G 'aster 'ostomitm 

 triglse v. Ben. 



Japanese Schistosomiasis.^" — J- Tsuchiya describes a new human 

 disease due to the Trematode Schistosoma japonicum, which occurs in the 

 portal vein and its tributaries. The parasite also occurs in cat and dog. 

 The progress of the disease is very slow — it may go on for twenty or 

 thirty years. Infection is probably through impure drinking-water. 



* Zool. Jahrb., xxviii. (1909) pp. 1-22 (1 pi. and 2 figs.), 

 •f Ohio Naturalist, ix. (1909) pp. 506-8 (9 figs.). 

 J O.K. Soc. Biol. Paris, lxvii. (1909) pp. 179-81. 



§ Nova Acta R. Soc. Sci. Upsala, ii. ser. iv. No. 3 (1909) pp. 1-48 (5 pis. and 

 12 figs.). i| Ann. Nat. Hist., iv. (1909) pp, 1-25 (1 pi.). 



% Virchow's Archiv. f. Pathol. Anat., Band 193 C1908) pp. 323-69 (1 pi.). 



