STRUTIIIONES 



505 



phalanx, extensor longus pollicis ' inserted on to the thumb 

 side of the carpo-metacarpus, flexor digitorum profundus, 

 ulni-metacarpalis vent rails? ' In one specimen (A. an sir alls') 

 a minute tendon was seen preaxial of that of the deep flexor 

 and passing to the preaxial side of the carpo-metacarpus,' a 

 rudimentary Interosseous dor sails in 

 one specimen of A. Bi/Ueri. 



In the leg the muscle formula is 

 complete. 



The tongue in all these birds is 

 aflat triangular organ, relatively small 

 in size. The accompanying cut (fig. 

 234) shows its characters in Rhea ; 

 it does not show any differences of 

 importance, in the other genera. 



The course of the intestine in 

 Strutliio camelus is shown in fig. 

 12, p. 28. It will be observed that 

 it is in many respects exceedingly 

 simple : thus the greater part of 

 the small intestine is thrown into a 

 series of short folds, with none of 

 the longer and more specialised folds 

 found in many other birds. The 

 duodenal loop is the only part of the 

 small intestine which shows a special 

 fold, and this is a loop with a short 

 lateral diverticulum Y-shaped, in fact. 



The next most characteristic feature of the intestines of this 

 bird is the enormous large intestine, which is for the greater 

 part of its extent thrown into folds like those of the small intes- 

 tine. In Casuariiis (see fig. 11, p. 28) the small intestine is 

 quite as simple as that of the ostrich ; the large intestine is 

 short and straight. The emu is practically identical with the 



1 PAEKEE terms it extensor metacarpi radialis brevis. I identify it as 

 above. 



' J Flexor ca>'2>i rmlialis of PARKER. 



FIG. 234. TONGUE AND 

 WINDPIPE OF Rhea Dar- 

 wini (AFTER GADOW). 



.V, liyil(l'jln,-,;il Ili-vve. 



