CAMELUS DROMEDAMUS. 133 



passing over the cms, and inserted into the pubis ; so that when they act, 

 they compress this body, by bringing themselves into a straight line. 



The membranous part is covered by a strong muscular coat which 

 has a kind of seam or middle line, both along the upper and lower 

 surfaces, so that the fibres are semicircular. The acceleratores are 

 very strong, thick muscles, arising from the crura on both sides, and 

 meeting in a middle raphe. 



Besides these muscles, which are in general common to all animals 

 of this order, there are two long slender muscles that take their origin 

 from the [anterior commissure of the sphincter ani]. 



[Family CAMELIDJZ.] 



Op the Camel [Camelus dromedarius, L.] . 



The hump on the back, in a lean camel 1 , is a pretty loose strong 

 cellular membrane, which I suppose is filled with fat : it has, perhaps, 

 somewhat the appearance of being gristly. 



There is a membrana nictitans. The inner surface of the eyelids, 

 at the inner canthus, is filled with the orifice of the ducts of glands ; 

 but I could not find the lacrimal gland, nor the puncta lacrymalia. 

 There is the light colour [tapetum] at the bottom of the eye. 



The cartilages of the first two ribs articulate with the sternum. 

 There is an elastic fascia all along the belly. The pelvis is wide. 



The heart terminates in a point at the apex, like an ox's. The 

 lungs have only one lobe on each side, and the lobulus medius, which 

 is [an appendage to the right lung]. 



The duodenum passes down the right, is long and convoluted, then 

 passes up, in which course it is attached to [the mesentery ?], then crosses 

 the body to the left behind the rectum 2 . 



The clitoris is external, similar to that of the rat ; it is like a kind of 

 nipple ; it runs serpentine ; and, where it passes along the prepuce, it 

 is attached to it, and is only like a ridge. It has a pretty large prepuce. 

 The plexus retiformis consists of two thick bodies, which become very 

 large when blown into. There is a common uterus, but no regular 

 os tinea? ; the uterus begins by a broad semilunar valve ; a succession 

 of which valves are placed in the common uterus in opposite sides of 

 the cavity, but not in opposition to one another so as to be in pairs. 



1 [Hunt. Prep. No. 1840. Hunter dissected and derived preparations from both 

 the one-humped camel or dromedary, and the two-humped or Bactrian camel.] 



2 [Home, Comp. Anat. i. p. 464.] 



