624 John. F. Holm, The Development of the Olfactory Organ ete. 
come into my bands, but it was too late to make any investigations 
as to the existence of a similar organ in the Teleostei as I did not 
possess series of embryos young enough for this purpose. 
Literature on the Development of the Olfactory Organ. 
C. K. HOFFMANN, »Zur Ontogenie der Knochenfische«. Archiv für mikrosko- 
pische Anatomie. Bd. XXIII. 1884. 
F. M. BALFOUR, »Development of Elasmobranch Fishes«. »Structure and De- 
velopment of Lepidosteus« in »BALFouR’s Memorial Edition« by M. 
Foster and A. SEDGwIcK. 1885. ; 
v. Wink, »Über die Kopfsegmente und die Phylogenie des Geruchorgans der 
Wirbelthiere«. Zoologischer Anzeiger. [X. 1886. 
C. von Kuprrer, »Studien zur vergleichenden Entwicklungsgeschichte des 
Kopfes der Kranioten«. 1893. 1894. 
Explanation of Plate, 
Plate XVII. 
All figures are drawn with the ABBE Camera and the lenses 16 mm, 8 mm, 
and 4 mm, by ZEISS. 
Fig. 1. Transverse section through an embryo 28 days old. Alum-Carmine 
preparation. Apochromate 4 mm. Comp. Oc. 4. 260/1. 
Fig. 2. Transe. sec. emb. of 38 days. Alum-Carmine prep. Apoc. 4 mm. Comp. 
Oc. 4. 260/1. 
Fig. 3. Sagital section. emb. of 46 days. Alum-Carmine prep. Apoc. 4 mm. 
Comp. Oc. 4. 260/1. 
Fig. 4. Sag. sec. emb. of 60 days. Alum-Carmine prep. Apoc. 4 mm. Comp. 
Oc. 4. 260/1. 
Fig. 5. Sag. sec. emb. 18 mm, Haematoxylin-Eosin prep. Apoc. 8 mm. Comp. 
Oc. 4. 160/1. 
Fig. 6. Trans. sec. emb. 20 mm. Alum-Carmine and Aniline-Blue prep. Apoe. 
16 mm. Comp. Oc. 4. 70/1. 
Trans. sec. emb. 60 mm. Alum-Carmine and Aniline-Blue prep. Apoe. 
16 mm. Comp. Oc. 4. 50/1. 
1 
. 
Fig. 
Reference letters in Above. 
Ol. O. olfactory organ. Ze. ectoderm. Mes. mesoderm. F. B. fore brain. 
V. ventral side of embryo. D. dorsal side of embryo. 
Bone and Cartilage are tinted Blue. 
Stockholm, March 18th 1894. 
ere 
