OVARY AND OVARIAN OVA IN CERTAIN MARINE FISHES. 159 



After the formation of yolk has commenced the membrane 

 of the vesicle is wrinkled. The nucleoli migrate from the 

 periphery of the vesicle, and are found around and among the 

 central fibrils. 



There are indications in the ova of the turbot that the 

 substance of the nucleoli is absorbed into the central fibrils 

 to form the chromosomes of the polar mitoses, but the actual 

 formation of these chromosomes was not followed. 



List of Papers and Books cited, in Chronological Order. 



(1 Emeey, Carlo. — * Fauna und Flora des Golfes vou Neapel : ' 11'^ 

 Monographie, " Fierasfer," Leipzig, 1880. 



(2) ScHULZE, 0. — "Ueber die Reifung und Befruclitung des Amphibiencies," 



'Zeitschr. f. wiss. Zool.,' 1887. 



(3) Boverl— " Zellenstudien," 'Jenaische Zeitscbr.,' 1888. 



(4) BovERi. — " Zellenstudieu : ueber das Verbalteu der Ciiromatiscbeu 



Kernsubstanz, &c.," ibid., 1889. 



(5) Hertwig, 0. — " Vergleich der Ei-und Samenbilduug bei Nematoden," 



'Arch. f. mik. Anat.,' Bd. xxxvi, 1890. 



(6) Henneguy, L. F. — " Nouvelles Recherches sur la Division cellulaire 



indirecte," ' Journ. de I'Anat. et de la Physiol.,' t. xxvii, 1891. 



(7) Born, G. — " Die Reifung des Amphibieneies und die Befruchtung 



unreifer Eier bei Triton tseuiatus," 'Anat. Anz.,' Bd. vii, 1892. 



(8) RiJCKERT, J. — " Zur Entwiekelungsgeschichte des Ovarialeies bei Sela- 



chiern," ' Anat. Anz.,' Bd. vii, 1892. 



(9) RucKERT, J. — " Ueber die Verdoppelung der Chromosomeu im Keim- 



blaschen des Selachiereies," 'Anat. Anz.,' Bd. viii, 1892-3. 



(10) FiCK, R. — "Ueber die Reifung und Befruchtung des Axolotleies," 



' Zeits. f. wiss. Zool.,' Bd. Ivi, 1893. 



(11) Henneguy, L. F.— "Le Corps Vitellin de Balbiani dans I'ceuf des 



Vertebres," ' Journ. de TAnat. et de la Physiol.,' tome xxix, 1893. 



(12) Balbiani, E. G. — " Ceutrosome et Dotterkeru," ' Journ. de I'Anat. et 



de la Physiol.,' tome xxix, 1893. 



(13) Rath, 0. vom. — " Beitrage zur Kenntniss der Spermatogenese von 



Salaraandra maculosa," Parts I and II, 'Zeits. f. wiss. Zool.,' 

 Bd. Ivii, 1894. 



(14) Cunningham, J. T.— "The Ovaries of Fishes," 'Journ. Mar. Biol. 



Ass.,' vol. iii. No. 2, 1894. 



