﻿DR. J. MURIE ON THE THREE-BANDED ARMADILLO. 93 



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The middle keeled basal division has a superior articular prominence for the attachment 

 of the ceratohyal, and below is produced into a broadish terminally blunt (barely bifid) 

 apex. The depth of the hyoid at its carinal aspect is 25 inch. The ceratohyal is a 

 small nodule of bone, with bursal and a free fibroid connexion with the basi-, thyro-, 



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and epihyal. The latter bone is stoutish and 0*3 inch long. The stylohyal is slenderer 

 and fully longer, its cranial end being tipped with a short cartilage. 



As respects the larynx, it is composed of very soft flexible cartilaginous material, 

 a restricted narrow triangular area at the pomum admni and inferior margins of the 



; alone showing ossific deposit. The thyroid alae are inflated and rounded, with a 

 pronounced middle antero-inferior widish cleft. Superior and inferior cornua are short. 

 In front the cricothyroid membrane and space are large and transversely diamond- 

 shaped. The cricoid cartilage forms a complete ring, and anteriorly presents consider- 

 able depth. Posteriorly it has a broad and somewhat chevron-shaped outline, with a 

 central most unusually prominent ridge. Besides, the lateral edges are also much raised, 

 leaving a deep depression for the cricoarytenoid muscles. The triangular arytenoid 

 cartilages are flat but fau-- sized ; and from their anterior apex is a small cartilaginous 

 offshoot, answering either to the cartilage of Santorini or Wrisberg \ The epiglottis 

 is a wide and large leaflet, very soft and flexible, and apically slightly notched I The 

 fissure of the rima glottidis is 0*2 inch long, narrowed behind ; and there is an absence of 



pouching in the interior of the larynx. 



The variation of figure &c. of the larynx in Dasypiis and Tatmia is but slight, the 

 depth and fulness of the thyroid and cricoid cartilages being, mayhap, relatively greater. 

 Ilyrtl {I. c. tab. vi. fig. 5), in a magnified view, shows by a section the inner laryngoul 

 aspect of Chlamydophorus, and in his text refers to the vocal cords &c., obviously not 



unlike the same in Tolypeutes. 



Among the muscles attached to the foregoing parts, the thyrohyoidei arc well 

 developed ; and there are fair and clearly differentiated representatives of cricothyroidci, 

 posterior cricoarytsnoidei, and arytseno-epiglottidei, with normal attachments. Others 

 doubtless are present, but less appreciable from their small size. 



4. Taso- Nervous Arrangements 



Vessels.— I distinguished but a single vena cava descendens and one ascendens. 



The arch of the aorta, as Owen^ observes of Da^ypus {Tatusia) peba, splits mto mam 

 trunks precisely as in the human subject-i. e. a short innominate, wherefrom a right 

 subcla.-ian and common carotid are derived, the left carotid and subclavian artenes 

 issuing separately from the arch. 



' Alessandrini remarks, " Le cartilagini accessorie del Santorini e del Wrisberg mancano intemnente, clrco«tenzn 

 avvertita anche dal piu volte lodato De B^pp, asserendo in genera che negU Armadilli I'organo descntto i piutto.to 



308) 



through the arch of the soft palate (P. Z. 8. 1831 



p. 144). Under certain c( 

 peutes. 



• P. Z. S. 1831, p. 143. 



,ain 



