Genital System of the Myxinoidea 101 



tion of maturity because each egg receives most of the blood in the corresponding seg' 

 mental ovarian artery. 



2. After escape of the mature ova, the ruptured ovarian follicles (corpora lutea) 

 are resorbed. 



3 . All eggs in the ovary are arrested in development until the corpora lutea are almost 

 completely resorbed. 



4. Traces of corpora lutea and atrophied eggs remain in the ovary as "brown bodies." 



5. The spawning time is not definitely known. 



The preponderance of evidence based on embryology, contributed by various in' 

 vestigators, indicates that the Myxinoidea are primitive, and belong to the Gnathostomes. 

 Stensio, the sole investigator in the field of paleontology, regards the Myxinoidea as 

 primitive, but classes them with the Agnathostomes. 



LITERATURE CITED 



Ayers, Howard 



1894 Bdellostoma domheyi, Lac. Biological lectures delivered at the Marine Biological Laboratory 

 of Woods Hole in the summer session of 1893. Boston, pp. 125-161, 14 text -figs. 

 CoNEL, J. LeRoy 



1917 The urogenital system of myxinoids. Journ. Morph- 29, 75-163, 12 pis. (85 figs.). 



1929 The development of the brain of Bdellostoma stouti. I. External growth changes. Journ. 

 Camp. HenroL, 47, 343-403, 11 pis. (34 figs.), text-fig. 



1931 The development of the brain of Bdellostoma stouti. II. Internal growth changes. Journ. 

 Comp. J^eurol, 52, (in press). 

 Cunningham, J. T. 



1886 . 1 On the structure and development of the reproductive elements in Myxine glutinosa L. ^uart. 

 Journ. Micr. Sci., 27, 49-76, 2 pis. (14 figs.). 



1886 2 The reproductive organs of BdeHostomd. Trans. Roy. Soc. Edinburgh, 33, 247-250. Abstr. in 



Journ. R. Micr. Sac. London, 1888, 192-193. 



1887 1 Herr Max Weber and the general [generative] organs of Myxme. Zool. Anz., 10, 241-244. 



1887 . 2 The reproduction of Myxine. Zool. Anz., 10, 390-392. 



1891 Spermatogenesis in Myxine glutinosa. ^ucirt. Journ. Micr. Sci., 33, 169-186, 1 pi. (15 figs.). 

 Dean, Bash ford 



1899 On the embryology of Bdellostoma stouti. A general account of myxinoid development from 

 the egg and segmentation to hatching. Festschrift von C. von Kupffer, Jena, pp. 221-276, 12 

 pis. (137 figs.), 25 text-figs. 

 DoFLEiN, Franz 



1898 Bericht ueber eine wissenschaftliche Reise nach Californien. Mitteilungen ueber die Erlangung 

 von Eiern und Embryonen von Bdellostoma. S. B. Ges. Morph. u. Physiol, Miinchen, 14, 

 105-118, 9 text-figs. 



1899 Ueber die Eibildung und Eiablage von Bdellostoma stouti Lockington. Festschrift von C. von 

 Kuptfer, Jena, pp. 338-352, 3 pis., 6 text-figs. 



Jansen, Jan 



1930 The brain of Myxine glutinosa. Journ. Comp. N.eurol., 49, 359-507, 50 text'figs. 

 Kupffer, C. von 



1899 Zur Kopfentwicklung von Bde//ostoina. S. B. Ges. Morph. u. Physiol, Miinchen, 15, 21-35, 

 7 text-figs. 



1900 Zur Kopfentwicklung von Bdeilostoma. (In his Studien zur vergleichenden Entwicklungs- 

 geschichte des Kopfes der Kranioten, Miinchen u. Leipzig, Heft IV, pp. 1-83, 69 text-figs.) 



1906 Die Morphogenie dfes Centralnervensystems [Bdeliostorna]. {In O. Hertwig, Handbuch der 

 vergleichenden und experimentellen Entwickelungslehre der Wirbeltiere, Band II, Teil 3, pp. 

 24-38, 20 text-figs.). 



