54 



MANUAL OF ZOOLOGY 



SECT. 



cal 



CIS? 



In the proximal row are two bones, the astragalus {asi) and 

 the calcaneum (cal), both articulating with the tibia; the 

 calcaneum presents behind a long calcaneal process. The 

 distal row contains three bo'nes, the mesocuneiform t ectocunei- 

 form, and cuboid (cub) ; the ento- 

 cuneiform, which commonly forms 

 the most internal member of this 

 row in other mammals, is not pres- 

 ent as a separate bone. 



There are four metatarsals, the 

 hallux or first digit being absent. 

 Each of the digits has three pha- 

 langes, which are similar in character 

 to those of the manus. 



The ccelom of the rabbit differs 

 from that of the pigeon in being 

 divided into two parts by a trans- 

 verse muscular partition, the dia- 

 phragm. The anterior part, or 

 thorax, contains the heart and the 

 roots of the great vessels, the lungs 

 and bronchi, and the posterior part 

 of the oesophagus. The posterior 

 part or abdomen contains the stom- 

 jp. ach and intestine, the liver and 



pancreas, the spleen, the kidneys, 

 FIG. 303. Lepus cuniculus. 



Skeleton of pes; ast, astrag- ureters and urinary bladder, and the 



alus; cal, calcaneum; cub, . , 



cuboid; cnn, cuneiforms; Organs OI reproduction. 



The teeth (Fig. 299) are lodged 



in sockets or alveoli in the pre-maxillae, the maxillae, 

 and the mandible. In the pre-maxillse are situated four 

 teeth, the four upper incisors. Of these the two anterior 

 are very long, curved, chisel-shaped teeth, which are 



