The Nasal Organ in Amphibia volume Illinois Biological Monographs V 6 No 1
The Nasal Organ in Amphibia volume Illinois Biological Monographs V 6 No 1
George Marsh Higgins
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The small planum basale is similar to that in Cryptobranchus, but the larger cornu in the 37 mm. Stage is more like that of Amblystoma. My material does not show the formation of the planum verticale, but it evidently does not arise as a dorsal growth from the planum basale, but more probably by medial growths from the ethmoidal columns; thus in this particular, approaching the condition in Salamandra. The complete absence of intermaxillary glands, the close approxima- tion of the capsules ante...rior to the planum basale, as well as the small size of the latter, are points of similarity to Cryptobranchus, which, on the evidence of larval characters alone, I believe Spelerpes more closely resem- bles. 27] THE NASAL ORGAN IN AMPHIBIA— HIGGINS 27 PLETHODON ERYTHRONOTUS Winslow (1898) has described the nasal capsule of a 20 mm. Larva of Plethodon glutinosus, and he compares it with a 45 mm. Amblystoma. I have not studied any larval form of this genus, but have examined and modelled the capsule of an adult, which is similar in many respects to my last stage of Amblystoma.
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