ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 185 



such chains may be separated off mechanically, and may give rise to 

 asexually reproductive individuals. These usually differ from the normal 

 individuals in the number of pairs of setose bundles. Their progeny was 

 followed with care, but the normal number always re-appeared. 



Nematohelminth.es. 



Filaria immitis.* — G. Noe gives some details in regard to the passage 

 of this parasite through the medium of a mosquito (Anopheles) from 

 host to host. 



Filaria perstans in relation to Sleeping Sickness. f — G. C. Low, 

 after studying the distribution and the pathological conditions of this 

 disease, comes to the conclusion that Filaria perstans has nothing to do 

 with it, its occasional presence being only a coincidence, as is the presence 

 of AnTcylo stoma duodenale, Ascaris lumbricoides, Trichocephahis dispar, 

 and Bilharzia hmnatobia. The worm probably produces no pathological 

 -symptoms whatever. 



Platyhelminth.es. 



Oscillatory Movements of Convoluta roscoffensis.J — Georges Bohn 

 describes the behaviour of this Turbellarian. There are two main 

 movements. When the tide comes in they bury themselves in the sand ; 

 when the tide is out they form green patches on the sand. They avoid 

 the two dangers of being swept away and of being dried up. Their 

 movements are synchronous with those of the sea, like those of the 

 Annelid Hediste diversicolor, and are not referable to the influence of 

 light, as they occur as precisely at night as during the day. 



Revision of Classification of Polyclad Turbellarians.§ — F. F. 



Laidlaw suggests a revision based mainly on the characters of the vagina 

 and prostate gland. He gives a diagnostic key for the Acotylea and 

 Cotylea, and a grouping of the Acotylean genera in eight families. 



Structure of Mesostoma nasonoffii Graff.|| — W. Zykoff gives a 

 description of this Russian Turbellarian, allied to M. obtusum, which 

 has not been adequately diagnosed hitherto. 



Cysticercus cellulosae on Dog's Brain. f — Ball and Marotel re- 

 cord what is a rare occurrence, the presence of numerous (30) bladder- 

 worms on the surface of the cerebral hemispheres of a dog. The 

 characters of Cysticercus celluloses were unmistakable. The parasitism 

 was fatal. 



Cestodes of South American Marsupials.** — F. Zschokke, following 

 up H. von Ihering's suggestion, calls attention to the occurrence of 

 Oochoristica and Linstowia in these forms. The former never occurs 

 except in the old autochthonous forms ; its presence is, as it were, one 



* Atti. (Rend.) R. Aocad. Lincei, xii. (1903) pp. 476-83 (3 figs), 

 ft Roy. Soc. Rep. Sleeping Sickness Comm., ii. (1902) pp. 64-9. 



% Comptes Rendus, exxxvii. (1903) pp. 576-8. 



§ Mem. Manchester Lit. and Phil. Soc, xlviii. (1903) No. 4, p. 16 (5 figs.). 



|| Bull. Sue. Imp. Nat. Moscow (1903) pp. 183-7 (1 pi.). 



Tf Ann. Soc. Linn. Lyon, lxxxix. (1903) pp. 55-6. 

 ** Zool. Anzeig., xxvii. (1904) pp. 290-3. 



April mh, 1904 ° 



