. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. DE VILLIERS: ASCAPHUS TRUEI STEJNEGER Cranial Anatomy Nasal region. There is nothing very unusual in the organs en- countered in this region, and particularly nothing that can be con- sidered as strikingly primitive. Very prominent in sections of the tip of the snout are the glandulae intermaxillares, to which Noble (1931, p. 201) ascribes the function of secreting a sticky secretion for making. Sth/m/x Fig. 1. Transverse section through the tip of the snout of Ascaphus to show the glandula intermaxillaris in situ. (T
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. DE VILLIERS: ASCAPHUS TRUEI STEJNEGER Cranial Anatomy Nasal region. There is nothing very unusual in the organs en- countered in this region, and particularly nothing that can be con- sidered as strikingly primitive. Very prominent in sections of the tip of the snout are the glandulae intermaxillares, to which Noble (1931, p. 201) ascribes the function of secreting a sticky secretion for making. Sth/m/x Fig. 1. Transverse section through the tip of the snout of Ascaphus to show the glandula intermaxillaris in situ. (The central lumen of the gland mass has not yet appeared in section.) cpi = cartilago praenasalis inferior; cpsp = cartilago praenasalis superior; drgl = dermal glands; ltgim = region of larger tubules of glandula intermaxillaris; pmx = premaxilla; pnrpmx = prenasal ramus of premaxilla; spn = septum nasi; stgim = region of smaller tubules of the glandula intermaxillaris; stpmx = symphysial tissue between the two pre- maxillae; ten = tectum nasi; ves = vestibule. the tongue adhesive. The physiology of these glands was first investi- gated by Wiedersheim 1876, later information on the subject is con- tained in Gaupp (1904, p. 24), Krause (1923 pp. 49S and 547) and Miiller (1932). If the usually accepted theory of the function of these glands is correct, Ascaphus must be an active insect hunter. In Fig. 1. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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