140 Mr. E, C. Punnett. On the Composition and 



thelial cells by mitotic division in the earlier stages. In the latter 

 respect it tends to agree with Belloy,* who, however, describes active 

 multiplication of these cells, and does not appear to recognise the 

 proliferation of the cells of the theca interna. On the other hand the 

 foregoing account is entirely opposed to the views expressed since the 

 publication of Sobotta's work by His,f Koelliker,f Nagel,| CIark,§ 

 Rabl,|| and Doering,H who all more or less clearly describe the corpus 

 luteum as an entirely connective-tissue structure. 



It remains fco be added that the work is being carried on in the 

 Zoological Department of the University of Edinburgh. 



[Postscript, February 22. — Since writing the above account of the 

 development of the corpus luteum, I have obtained a 16-hour stage 

 from a sheep which was an unusually late breeder. The characters of 

 the young corpus luteum at this stage are intermediate between those 

 of the 7-hour and 24-hour stages. The inward growth of the connec- 

 tive-tissue cells has begun. The sections pass through the point of 

 rupture, which is widely open.] 



" On the Composition and Variations of the Pelvic Plexus in 

 Acanthias vulgaris" By E, C. Punnett, B.A., Gonville and 

 Caius College, Cambridge. Communicated by Dr. H. Gadow, 

 F.E.S. Received February 16 — Eead March 7, 1901. 



(Abstract.) 



The facts recorded in this paper may be summarised as follows : — 



(1) Considerable variation occurs in Acanthias vulgaris with regard 

 to— 



(a) The serial number of the girdle-piercing nerves ; 



(b) The number of the post-girdle nerves ; 



* Belloy, " Eeclierclies sur l'origine des corps jaune de l'oraire chez le rat et le 

 cochon d'Inde," ' Comptes Bendus de 1' Association des Anal omistes,' publies par 

 le Professeur A. Nicolas, premiere session, Paris, 1899. 



f Mis, \ " Verb and lun gen der Anatorniscben Gesellschaft auf der zwolften 



Koelliker, J Yersammlung in Kiel," April, 1898, 'Anat. Anz.,' vol, 14. 



X Nagel, ".Die weiblichen Gescblecbtsorgane," ' Handbucb der Anatomie des 

 Menscben,' berausg. von K. t. Bardeleben, bd. 7, teil 2, abt. 1, Jena, 1896. 



§ Clarlc, " Ursprung, Wacbstmn und Ende des Corpus luteum, &c," ' Arcb. f. 

 Anat. u. Physiol., Anat. Abtb.,' 1898. 



|| Eabl, "Beitrag zur Histologic des Eierstocks," &c, 'Anat. Hefte,' vol. 11, 

 1898. 



• ^[ Doering, "Beitrag zur Streitfrage uber die Bildung des Corpus luieum," 

 'Anat, Anz.,' vol. 16, 1899. 



