The nasal organ in Amphibia by George Marsh Higgins

The nasal organ in Amphibia

byGeorge Marsh Higgins

Paperback | February 8, 2012

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1916 Excerpt: ... and the verticale, the lamina medialis is pierced by two foramina, through the dorsal of which, the nasalis internus of the profundus nerve passes to the intermaxillary gland; while a blood vessel passes through the more ventral one. A small prenasal process extends anteriorly a short distance from the median ventral surface of the cupola. The internasal space is deep and narrow, and it is filled with intermaxillary glands which extend back beneath the planum basale, to its posterior margin. In the presence of these glands, Plethodon differs from Cryptobranchus and Spelerpes but resembles Amblystoma and Salamandra. In all essentials Plethodon resembles very closely the adult Amblystoma to which it is probably nearly related. The absence of earlier stages has prevented a study of the development of the capsule; but comparing the single larval stage of Winslow with my early stages of Amblystoma, coupled with the many resemblances between the adults, I am inclined to place Plethodon very near to Amblystoma. The absence of the fenestra infra-conchalis in Plethodon is the primary difference between these capsules; but the position and size of the planum verticale, the lamina externa and medialis, the anterior cupola as well as the large dorsal and ventral gaps are resemblances that suggest a very close relationship between these animals. NECTURUS MACULATUS As in Spelerpes, the chondrification of the nasal capsule of Necturus is greatly retarded; so that, except for the mere extension of the trabeculae into the head region, there is no evidence of a nasal skeleton up to the 25 mm. stage. In higher Urodeles of this size, well developed capsules are already chondrified. In a 24 mm. larva, the trabecular crests are not developed, and the cylindrical trabeculae incli...

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Title:The nasal organ in AmphibiaFormat:PaperbackDimensions:32 pages, 9.69 × 7.44 × 0.07 inPublished:February 8, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217804543

ISBN - 13:9780217804547

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