830 MAMMALIA. 



The epiglottis and arytenoid cartilages are elongated and approximated, 

 so that the rima glottidis is thus situated at the apex of a cone-shaped 

 larynx (fig. 418, B, a), which projects, as in the CETACEA, into the poste- 

 rior nares, where it is closely embraced by the muscles of the soft 

 palate. The air-passage is thus completely separated from the fauces, 

 and the injected milk passes in a divided stream, on either side of the 

 larynx, into the oesophagus." 



" Thus aided and protected by modifications of structure, both in the 

 system of the mother and in its own, designed with especial reference 

 to each other's peculiar condition, and affording therefore the most 

 irrefragable evidence of Creative foresight, the feeble offspring continues 

 to increase from sustenance exclusively derived from the mother for a 

 period of about eight months. The young Kangaroo may then be seen 

 frequently to protrude its head from the mouth of the pouch, and to 

 crop the grass at the same time that the mother is browsing. Having 

 thus acquired additional strength, it quits the pouch, and hops at first 

 with a feeble and vacillating gait ; but continues to return to the pouch 

 for occasional shelter and supplies of food, till it has attained the weight 

 of ten pounds. After this it will occasionally insert its head for the 

 purpose of sucking, notwithstanding another foetus may have been de- 

 posited in the pouch ; for the latter, as we have seen, attaches itself to 

 a different nipple from the one which had previously been in use." 



(2453.) Thus therefore are we conducted by the Ovovivipara, as 

 the MABSFPIALIA are properly called, to the most perfect or placental 

 type of the generative system. 



(2454.) Commencing our account of the reproductive organs of VIVI- 

 PAROUS MAMMALIA by examining those of the male sex, we have another 

 striking example of the insufficiency of the nomenclature employed by 

 the anatomist who confines his studies to the human body, when it 

 becomes necessary to describe corresponding organs even in animals 

 organized after the same type. 



(2455.) True it is that there is the same general arrangement of 

 the generative apparatus ; and it is convenient, as far as possible, to 

 apply the same names to structures that apparently represent each 

 other : but a very superficial examination of the facts will serve to 

 show that great differences exist between them ; and, accordingly, we 

 are not surprised to find the utmost perplexity and confusion in the 

 descriptions of these parts, arising from the indiscriminate application of 

 the terms employed in human anatomy to totally dissimilar structures. 



(2456.) It is not, however, our business here to criticize the labours 

 of authors upon this subject ; we must content ourselves with selecting 

 an example of one of the more complex forms under which the male 

 genitals present themselves, and leave the reader to contrast the various 

 organs with those met with in the human subject. 



(2457.) The annexed figure (fig. 419, A) represents the generative 



