Anatomy of the Alligator. 287 



45. Marsupialis internus. 0"59 oz. 



These muscles agree with those described under the same 

 name in the Crocodile {ihid. p. 330) ; and they are called 

 obturator muscles by those anatomists who consider the mar- 

 supial bone to be the pubes. 



46. Peroneo-calcaneus. 0*22 oz. O. from the fibula, at its 

 lower extremity. I. into the upper surface of the calcaneum. 



47. Extensor brevis. 0*87 oz. These short extensors are 

 distributed to all the toes. 



48. Lumbricales. 1*13 oz. 



II. Muscles of the Fore Limh. 



a. Trapezius. 0*33 oz. O. from the cervical fascia beneath 

 the cervical scutes. I. into the anterior edge of the acromion, 

 (PI. X. fig. 2, acr.). 



b. Sterno-atlanticus. 1*46 oz. O. from the whole breadth 

 of the sternum, in front of its articulation with the coracoid. 

 I. into the transverse process of the second cervical vertebra. 



c. Sterno-mastoideus. Record lost. 



d. Omo-hyoideus. 0"36 oz. 



e. Rhomboideus*. 0'45 oz. 0. from spinous processes of 

 last cervical and first dorsal vertebra. I. anterior and verte- 

 bral edge of scapula. 



f Serratus magnus. 4*14 oz. 



Serratus anticus has its origin from the second to the eighth 

 vertebra. 



Serratus posticus from the ninth to the fourteenth vertebra 

 (ribs). 



1. Teres major. 0'18 oz. Origin and insertion as usual. 



2. Latissimus dorsi. 0*95 oz. O. from the four anterior 

 dorsal scutes. 



3. Subscapularis. 0*84 oz. 



4. Pectoralis minorf. 0'57 oz. 0. from the outer surface 

 of the coracoid. 



5. Pectoralis major. 7'68 oz. O. from the entire length 

 of the sternum and from the abdominal ribs, two-thirds of dis- 

 tance to the pelvis. 



6. Pectoralis (avium)? 0*90 oz. O. from the first sternal 

 rib. I. into the posterior edge of the coracoid. 



7. Coraco-brachialis. None. 



8. Subclavius. None. 



9. Deltoideus. 1'63 oz. 0. from the whole outer and 



* Meckel describes the rhomboid as smaller than the trapeze. 



t This muscle is regarded by some as a coraco-brachialis superior. 



