No. 2.] DEVELOPMENT OF PETROMYZON: 301 



The next paper of this series will deal with the development 

 of the alimentary canal and its accessory structures, of the skin, 

 skeleton, muscles, and urinogenital system. 



Morphological Laboratory, 



Princeton, N.J., Nov. 15, 18S7. 



LIST OF PAPERS REFERRED TO. 



(1.) Ahlborn. Untersuchungen lib. d. Gehirn d. Petromyzonten. Zeit- 

 sclir f. iviss. Zool. Bd. XXXIX. 



(2.) Id. — Ueb. d. Ursprung und Austritt d. Hirnnerven von Petromjzon. 

 Ibid. Bd. XL. 



(3.) Id. — Ueb. d. Bedeutungd. Zirbeldruse. Ibid. Bd. XL. 



(4.) Balfour. Tlae Development of the Elasmobranch Fishes. 1877. 



(5.) Id. — A Treatise on Comparative Embryology. Vol.11. 18S1. 



(6.) Beard. The System of Branchial Sense-Organs and their Associ- 

 ated Ganglia in Ichthyopsida. ^uart. Journ. Mic. Sci. Vol. XXVI. 



(7.) Id. — The Parietal Eye in Fishes. Nature. Vol. XXXVI. No. 924. 



(8.) Id. — The Parietal Eye in Fishes. Ibid. No. 92S. 



(9.) Blaue. Ueb. d. Bau d. Nasenschleimhaut bei Fischen & Amphibien. 

 Archiv.f. Anat. & PJiys. 18S4. 



(10.) Born. Ueb. d. inneren Bau d. Lamprete. Heusingers Zeitschr. f. 

 org. PJiys. 1827. 



(11.) DoHRN. Die Entstehung and Bedeutung d. Hypophysis bei den 

 Teleostiern. Mitth. Zool. Slat. Neapel. Bd. III. 



(12.) Id. — Die Entstehung d. Hypophysis bei Petromyzon Planeri. 

 Ibid. Bd. IV. 



(13.) Id. — Die Thyroidea bei Petromyzon, Amphioxus & Tunicaten. 

 Ibid. Bd. VI. 



(14.) FiJRBRiNGER, P. Die Muskulatur d. Kopfskeletes der Cyclostomen. 

 Jen. Zeitschr. Bd. IX. 



(15.) GoTTE. Die Entwicklungsgschichte der Unke. 1S75. 



(16.) Id. — Ueber die Entstehung und Homologien des Hirnanhangs. 

 Zool. Anz. 1883. No. 142. 



(17.) HuBRECHT. On the Ancestral Forms of the Chordata. ^uart. 

 your. Micr. Sci. Vol. XXIII. 



(18.) Huxley. Preliminary Note upon the Brain and Skull oi Amphioxus 

 lattceolatus. Proc. Roy. Soc. Lo7id. Vol. XXIII. 



(19.) Johnson & Sheldon. Notes on the Development of the Newt 

 {Triton cristatus). ^uart. Journ. Micr. Sci. Vol. XXVI. 



(20.) JuLiN. Sur I'hypophyse des Ascidies simples, etc. Arckiv. de 

 Bioldgie. T. II. 



(21.) Ketel. Ueb. das Gehororgan der Cyclostomen. Hasse's Anat. 

 Stud. Heft III. 1872. 



(22.) Langerhans. Untersuchungen iiber Petromyzon Planeri. Verk. 

 d. Naturforsch. Ges. Freiburg i. B. ^873. 



(23.) Marshall & Spencer. Observations on the Cranial Nerves of 

 Scyllium. ^.lart. Journ. Micr. Sci. Vol. XXI. 



(24.) J. MiJLLER. Vergleichende Anatomic der Myxinoiden. Abhand. 

 Berlin. Akad. d. Wissensch. 1836 et seq. 



