MYOLOGY OF REPTILES. 



235 



marginal ones ; it is Inserted along a sigmoid line extending from 

 the postero-external angle of tlie liypostcrnal to the middle of the 

 xiphisternal and by a special fasciculus and tendon into the lateral 

 process of the pubis. 



The lattsftimus colli, figa. 151, 152, 21, consists of two parts; 

 both arc attached, above, to aponeuroses connecting them with 

 the cervical diapojihj'ses ; the fibres of the posterior di-^'ision, 

 fig. 149, 21 a, pass down and rather backward, over the muscles of 

 the base of the neck, and are inserted into the midline of the 



151 



8iik' vk'W iif ^iipcillcial iiiuscK'S nT trunk. liOfiQ rinil linilt.^, /iyft/K Eiirop^irr. xxx\"ill. 



epi- and ento-sternals : the fibres of the longer anterior portion 

 sweep transversely across the lateral and lower parts of the neck, 

 fig. 152, 21. 



The extensor caudcB, fig. 151, 47, includes the neural jiortions of 

 the myocommas of this region from its base, where the foremost 

 has a sacral origin, to near the tip. The flexor caudce. lateralis, 

 ib. 48, consists of the lateral parts of the same muscular seg- 

 ments. The flexor caudce inferior is shown at ib. 49 : i\\e flexor 

 caudce, lumhalis in fig. 150, 50 : the flexor caudce ohturatorius in 

 figs. 151 and 156, 51. 



The following are muscles of the tympano-mandibidar arch. 



Tlie temporalis, figs. 151, 152, 1, arises from the parietal and 

 superoccipital spines, and is Inserted into the coromiid part of the 

 mandible. The pferT/f/oidexs, figs. 148, 149, 152, 4, arises from 

 the outer surface of the pterygoid, and is inserted into the internal 

 tuberosity of the articular element of the mandible. The apertor 

 oris, or digastricus, figs. 150, 15.3, 3, arises from the mastoid, and 

 is inserted into the angular process of the mandible. The dilatator 



