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Show 584 ON THE ANATOMY OF ORNITHORHYNCHUS. [Nov. 17, 16. KOLLIKER, DR. TH.-Ueber das os intermaxillare des Men-schen u. die Anat. der Hasenscharte. Nova Acta Acad. Caes. Leop.-Car. xliii. p. 325. Halle, 1882. 17. S C H W I N K , D R . J.-" Ueber den Zwischenkiefer und seine Nachbarorgane bei Saugethieren." Miinchen, 1888. EXPLANATION OF THE PLATES. PLATE XLIII. Fig. 1. Transverse vertical section of nasal cavities bebind nostrils and front of naso-palatine foramina. (a) Septal cartilage of nose. (b) Cartilage in roof of nose. (c) Cartilage in floor of nose just external to cavity containing Jacobson's organ. (d) Dumb-bell-shaped bone. (c) (f) (y). Three compartments of anterior part of nasal cavity. (h) («'). Integument of upper surface of bill; (h) its epithelial portion, (i) its subepithelial connective tissue. (k) (j). Integument of under surface of bill. Fig. 2. Transverse vertical section of nasal cavities behind naso-palatine foramina and through about middle of posterior swelling of dumb-bell-shaped bone. (e) Cartilaginous capsule of Jacobson's organ. (y) Its turbinal cartilage. (/) Nasal cavity. (m) External portion of premaxillary bone. (I) Large nerve external to nasal cavity. Other letters same as in fig. 1. Fig. 3. Transverse vertical section of nasal cavities bebind Jacobson's organ and in front of turbinated processes. (v) Vomer. (o) Olfactory nerve-fibres and (g) glandular tissue in ridge on inner wall of nasal cavity. (n) Nasal bone. (s) Palate-process of superior maxillary bone. Other letters same as in fig. 1. PLATE XLIV. Fig. 1. Same section as figure 2 of Plate XLIIL, but showing Jacobson's more highly magnified, drawn with camera. (h) Dumb-bell-shaped bone. (a) (a,) Cartilaginous capside of Jacobson's organ. (b) (b) Its turbinal cartilage. (c) Layer containing blood-vessels and glandular tissue. (d) Ciliated columnar epitbelium. (e) Layer of nerve-fibres. (,/') Sensory epithelium. (g) Cavity of Jacobson's organ. (i) Septal nasal cartilage. Fig. 2. View of outer wall of left nasal cavity, opposite turbinated processes. (a) Maxillo-turbinal, anterior extremity not sbown. (1) (2) (3) (4) (5) are the five ethmo-turbinals. (b) Nasal cavity bebind the turbinals. (c) indicates position, on under surface of specimen, of tbe posterior horny plate. |