*o4 Mr. Carlisle on a Peculiarity 



c, the subclavian vein. 



d, the first bone of the sternum, attached to its second bone, 

 and to the first and second ribs. 



e, the subclavian artery, passing into the axilla behind the 

 large veins, and dividing itself into a great number of equal- 

 sized cylinders, which cling together, frequently anastomose, and 

 take the ordinary route of the main trunks of arteries in the 

 upper limbs of quadrupeds. 



Fig. 2, the brim of the pelvis and groin of the Bradypus tri- 

 dactylus, with the vessels exposed. 



a, the aorta, where it divides into the two great iliac branches ; 

 the iliac artery on the right side being continued, to shew the 

 division into the anastomosing cylinders which are sent to the 

 muscles. 



b, part of the iliacus internus muscle. 



c, part of the bony margin of the pelvis leading down to 

 the pubes. 



Fig. 3, the upper limb of the Bradypus didactylus. 



a, a portion of skin on the top of the shoulder. 



b, the axillary artery, divided more in the ordinary way than 

 in the former animal. This creature had been preserved in 

 ardent spirit containing camphor ; and the dissection could not 

 be prosecuted so satisfactorily as to expose every small branch. 



c, part of the axillary plexus of nerves. 



Fig. 4, the iliac vessels of the Bradypus didactylus. 



a, the tendon of the psoas muscle. 



b, the iliac artery, proceeding into the thigh, where its divi- 

 sions are more discernible than in the upper limb. The cylin- 

 dric tubes were however much fewer than in the Bradypus 

 tridactylus. I counted only eight tubes in the inguinal fasciculus 



