. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 8 INEZ L. WHIPPLE. In two regions the naso-labial glands come into close proxim- ity with other glands of such similar structure that the determi- nation of the actual relationship is very perplexing. One, at least, of the mesial tubules (Figs. 2 and 6, nip),1 turns dorsally nc nl. FIG. 6. Transverse section through head of adult Desmognalhus fusca (X 42), showing the naso-labial groove cut obliquely and the horizontal groove (grl) cut transversely. f»i, premaxillary bone. Other designations as in previous figures. before re
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 8 INEZ L. WHIPPLE. In two regions the naso-labial glands come into close proxim- ity with other glands of such similar structure that the determi- nation of the actual relationship is very perplexing. One, at least, of the mesial tubules (Figs. 2 and 6, nip),1 turns dorsally nc nl. FIG. 6. Transverse section through head of adult Desmognalhus fusca (X 42), showing the naso-labial groove cut obliquely and the horizontal groove (grl) cut transversely. f»i, premaxillary bone. Other designations as in previous figures. before reaching the mid-line and enters the foramen for the internal nasal branch of the ophthalmic nerve at the anterior end of the premaxillary bone. Through this foramen the tubule may be traced as far as the opening of the foramen into the intermaxillary space. In this space lie the much convoluted tubules of the intermaxillary gland (int), the orifice of which is in the mid-line of the roof of the mouth, a little anterior to the posterior nares. In the larger specimens the naso-labial tubule passes into the intermaxillary space and intermingles its convo- lutions with those of the intermaxillary gland. I have found it impossible from my preparations to determine whether the tubules of the two glands thus curiously intertwined become actually continuous or not. If such an anastomosis exists, how- ever, it is certainly established secondarily, for in small adults the naso-labial tubule has not reached the intermaxillary space but ends blindly within the foramen, and there is consequently 1In every case in which I have been able to demonstrate the relationships of this tubule with absolute certainty, it has proved to be one of the branches of the gland which opens on the ventral margin of the naris. 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 perfe
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
