400 REPORT ON ZOOLOGY, MDCCCXLIV. 



Kolliker, lias regarded the vesicles present in the fission- 

 globules (Furclmngs-kugeln) of the ova as actual nucleated 

 cells. He opposes the opinion of Bagge and the Reporter, 

 according to whom the embryo-cells within the fission-glo- 

 bules of these Nematoda increase by division ; he is much 

 more inclined to believe that he has observed in this case 

 also, the multiplication of the embryo-cells to be effected by 

 an endogenous formation, as in Ascaris dentaia, but with 

 this difference that the vitelline substance does not surround 

 the common mass of cells, but that, on each new formation 

 of cells, a portion of the vitellus completely envelops the 

 individual cells, whence arises the fission of the vitellus. 

 Consequently, if the formation of these fission-globules be 

 dependent upon each multiplication of the embryo-cells, the 

 multiplication of the latter must precede the production of 

 new globules. Kolliker endeavours to explain this by 

 assuming that the embryo-cells exert a sort of attraction on 

 the surrounding vitelline substance. To the question, 

 why in other Entozoa this attractive force of the embryo- 

 cells acts upon and divides the vitelline substance, Kolliker 

 certainly does not venture to give a reply. 



Rayer (Archives de Med. comp. 1. c. p. 146) believes 

 that he found beneath the palpebral conjunctiva in the left 

 eye of an Emberiza pecoris, \Vils., an Ascaris leptoptera, 

 which, according to Rudolphi, occurs only in the oesophagus 

 of the Lion. But, as Rayer does not give a more minute 

 description of this worm, and refers merely to a rough 

 drawing made by himself, the Reporter would inquire 

 whether it were correctly determined, as the lion in all pro- 

 bability would scarcely have one and the same Round-worm 

 in common with the bird in question. Bellingham (Annals 

 of Nat. Hist. 13, p. 167) notices 42 Irish species of Ascaris, 

 among which nine are doubtful, which were met with in the 

 small intestine of Charadrius hiaticula, Sterna hirundo, and 

 Anas [Mareca] penelope; furthermore, in the oesophagus of a 

 Mergus merganser, in the crop of a Procellaria anglorum, in 

 the intestine of Cycloptcrus lumpus, and in the peritoneum of 



