THE GREAT ANTEATER. 125 



p. 130. The salivary bladder (e) is relatively larger than in the Great Anteater, and is a 

 simple pyriform sacculus receiving the secretion of the great gland by three or four short 

 ducts, entering obliquely at its fundus : the apex of the bladder is continued into the 

 long and slender duct which terminates in the mouth just behind the symphysis man- 

 dibulae. Figure 2 of PI. XL. shows a further dissection of the right submaxillary salivary 

 gland and bladder in another species of Armadillo (Dasypus Peba'). The saliva which 

 these reservoirs contain is very tenacious, the serous part being probably absorbed 

 during its detention. Thus prepared and accumulated, it is expelled at the extremity 

 of the mouth, in order to lubricate the tongue, which is thus, as in the Anteaters, made 

 subservient to the catching of insects ^. 



In the Spiny Anteater of Australia [Echidna), the homologues of the submaxillaries 

 are as largely developed as in the hairy Anteaters of America, and are subpectoral and 

 subcervical in position ; but they are not blended together. The primary lobes are 

 fewer and larger than in the My rmeco phages, and the secretion is carried from each gland 

 by a single relatively very wide duct. When the duct has reached the interspace of 

 the lower jaw, it dilates and then divides into eight or ten undulating branches, which 

 subdivide and ultimately terminate by numerous orifices upon the membranous floor of 

 the mouth. This unique modification of a salivary apparatus is figured and described 

 in my Article Monotremata of the ' Cyclopedia of Anatomy and Physiology,' 8vo, vol. iii. 

 1847, p. 388, fig. 188. 



Muscles of the Mandibular and Hyoid arches, and of the Tongue. 



Mylohyoideus. — The muscle answering to the mylohyoideus is of unusual extent, and 

 is divisible into different portions : the first of these is a thin layer of transverse fibres 

 (PI. XXXVII. fig. I, g), extending from the symphysis menti about five inches back- 

 wards : the fibres pass from the under and outer side of one mandibular ramus to 

 the opposite ramus, and are attached along the middle line of their central surface to 

 the long and thin tendon of the geniohyoideus : the posterior transverse fibres overlap 

 the anterior termination of the second division (A) of the mylohyoideus. The trans- 

 verse fibres of this division arise externally, or laterally, from the inner side of each 

 mandibular ramus, and are attached mesially and centrally to a continuation of the 

 tendon of the geniohyoideus, which may be seen shining through the fibres of the mylo- 



' Proceedings of the Zoological Society, 1832, p. 130. 



' The preparations exemplifying the above interesting modifications of the salivary apparatus are preserved 

 in the Physiological Series of the Museum of the Royal College of Surgeons, Nos. 772 L and M, and are 

 described in the first volume of my Catalogue of that Series, p. 228, 4to, 1831. Prof. Rapp, in his excellent 

 work, ' Uber die Edentaten,' 4to, 1843, has given a figure of this structure, in the Dasypus peba, and refers to 

 a description of it in an Inaugural Thesis by Winker, " Dissertatio sistens observationes anatomicas de Tatu 

 novemcincto. Prses. Rapp. Tubingen, 1824." This Thesis I have never seen, nor, as yet, been able to obtain : 

 I became aware of its existence only through the reference in the work above quoted. 



