414 MANUAL OF ZOOLOGY SECT. 



union of the elements in the median plane is called the 

 symphysis. In the hind-limb the tibia and fibula are fused to 

 form a'single tibio-fibula (Fig. 231, TI. FI) and the two bones 

 in the proximal row of the tarsus namely the tibiale 

 or astragulus (AST.) and the fibulare or calcaneum 

 (CAL.) are greatly elongated and provide the leg with an 

 additional segment. There are three tarsals in the distal 

 row, one of which appears to represent a central, another 

 the first distal carpal, and the third the fused second and 

 third. There are five well-developed digits, and on the 

 tibial side of the first is a spur-like structure or calcar (C.), 

 formed of three bones, a metatarsal and two phalanges : 

 such a rudimentary digit is called a proe-hallux. 



The mouth leads into a wide buccal cavity having in its 

 roof t\\e posterior nares (Fig. 235, p. na), a pair of projections 

 due to the downward bulging of the large eyes, and the 

 Eustachian tubes (ens. /., vide infra}. On its floor is the 

 large tongue (tng.\ attached in front and free behind, where it 

 ends in a double point ; by means of its muscles it can be 

 suddenly projected, point foremost, from the mouth, and is 

 used in the capture of insects. Immediately behind the 

 tongue is the glottis (g/.). Teeth are arranged in a single 

 series round the edge of the upper jaw, attached to the 

 premaxillae and maxillae ; there is also a small patch of teeth 

 (vo. /.) on each vomer just internal to the posterior nostril. 

 The teeth are small conical bodies, their bases ankylosed to 

 the bones ; their only use is to prevent the polished or 

 slimy bodies of the prey Insects and Worms from slipping 

 out of the mouth. 



The buccal cavity narrows towards the pharynx, which 

 leads by a short gullet (gul.) into & stomach (st.) consisting of 

 a wide cardiac and a short, narrow pyloric division. The 

 duodenum (du.) or first portion of the small in-testine, passes 



