Anatomy of the Alligator. 287 
45. Marsupialis internus. 0°59 oz. 
These muscles agree with those described under the same 
name in the Crocodile (ibid. 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 0z. O. from the fibula, at its 
lower extremity. I. into the upper surface of the caleaneum. 
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 Limb. 
a. Trapezius. 0°33 0z. O. from the cervical fascia beneath 
the cervical scutes. I. into the anterior edge of the acromion, 
(Pl. X. fig. 2, aer.). 
b. Sterno-atlanticus. 1°46 oz. O. from the whole breadth 
of the sternum, in front of its articulation with the coracoid. 
J. into the transverse process of the second cervical vertebra. 
c. Sterno-mastoideus. Record lost. 
d. Omo-hyoideus. 0°36 oz. 
e. Rhomboideus*. 0°45 0z. O. 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 0z. Origin and insertion as usual. 
2. Latissimus dorsi. 0°95 0z. QO. from the four anterior 
dorsal scutes. 
3. Subscapularis. 0°84 oz. 
4. Pectoralis minor}. 0°570z. QO. from the outer surface 
of the coracoid. 
5. Pectoralis major. 7°68 0z. 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 0z. 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. QO. from the whole outer and 
* Meckel describes the rhomboid as smaller than the trapeze. 
+ This muscle is regarded by some as a coraco-brachialis superior. 
