EEPEODUCTIVB ELEMENTS IN MYXINE GLUTINOSA. 75 



Catalogue of Literature concerning the Reproductive 

 Organs of Myxine. 



1845. Johannes Mulleb. — " Untersuchungen iiber die Eingeweide der 

 Eische," ' Schluss der Vergleichenden Anatomic der Myxinoiden/ 

 Berlin, 1845, pp. 4 and 5, Taf. i, Fig. 1, Taf. ii, Figs. 3, 4, 5, 6, 7, 8. 



1859. Dr. Allen Thomson, Professor of Anatomy in tlie University of 

 Glasgow. — Art. "Ovum," 'Todd's Cyclopaedia of Anat. and Phys.,' 

 vol. V, 1859, two figures in woodcut. 



1863. Prof. Steenstrup. — "Oversigt. Dansk. Vidensk. Selsk. Forhandl." 

 Kjbenliavn, 1863, p. 233, woodcuts. 



1875. Robert Collett. — " Norges Fiske," published as Supplement to the 

 ' Vidensk. Selsk. Forh. ' of 1874, Christiania, 1875. 



DESCRIPTION OF PLATES VI and VII, 



Illustrating Mr. J. T. Cunningham's Paper on the '' Repro- 

 ductive Elements in Myxine glutinosa, L. 



Fig. 1. — Specimen of the mature deposited ovum of Myxine in the Ana- 

 tomical Museum of the University of Edinburgh. Nat. size. 



Fig. 1, a. — One of the polar threads of the same specimen. Magnified 30 

 diam. 



Fig. 2. — Section through protoplasmic pole of ovarian egg of Myxine. 

 Length of the entire ovum, 16 mm. Plane of the section passes through 

 longer axis of the ovum, and is perpendicular to the mesoarium. a. Sheath of 

 vascular connective tissue, b. Follicular epithelium, c. The vitelline mem- 

 brane, d. The protoplasmic disc. ep. The process of the follicular epithelium 

 which passes into the micropyle. me. The mesoarium. Magnified 50 diam. 



Fig. 3. — The micropyle in section : from an ovum of the same ovary as 

 Fig. 2. c, d, as in preceding figure. ep. point to the hemispherical 

 termination of the cellular process. Magnified 280 diam. 



Fig. 4. — Section through protoplasmic pole of ovarian egg 20 mm. in 

 length. Plane of the section as in Fig. 2. a, b, c, d. as in Fig. 2. mi. The 

 micropyle, with contained cellular thread. P. Pits in the follicular epithelium, 

 in which the polar processes are contained, p. The polar processes of tlie 



