616 
DR. G-UNTIIER ON THE ANATOMY OE HATTEEIA. 
is formed by three heads: the broadest and most superficial arises from the os ilium* ; 
the second is slender and comes from a slight tubercular prominence on the end of the 
ilio-pubic suture ; the third is covered by the two former and attached to the anterior 
surface of the lower half of the femur. 
The second muscle, which takes its origin from the ascending portion of the os ilium, 
may be regarded as M. iliacus internus ; it is entirely covered by the M. rectus, and ter- 
minates along the outer and hinder surface of the upper half of the femur ; it draws the 
limb backwards and upwards. 
The M. pectineus arises from the ventral surface of os pubis and ilium and from their 
anterior edge, and, descending over the humeral joint to the antero-interior surface of 
the humerus, terminates just above the lower (third) branch of the extensor cruris ; it 
draws the limb forwards f. 
The M. gracilis runs parallel to the slender head of the M. extensor cruris ; it arises 
from the uncinate process of the os pubis, and is inserted into the hinder side of the end 
of the tibia. 
Immediately below the skin, the pelvic region is covered by a flat and thin muscle 
arising from the symphysis ossium pubis et ischii and the uncinate process of the os pubis ; 
it is the hindmost part of the M. obliguus abdominis externus. On removing this muscle 
a strong ligament, stretched from the uncinate process to the hinder end of the symphysis 
ossium ischii, becomes apparent. From this ligament, as well as from the tuber ischii, 
arises a mass of muscles divided into more or less distinct portions, which, however, 
cannot well be designated by names taken from human anatomy. We can only deter- 
mine it so far in a general manner, that, to judge from its origin and from its function 
of bending the lower leg, it corresponds to the MM. semimembranaceus, semitendinosus , 
biceps (and glutceus V) (fig. 34, b c ). Its largest portion covers nearly entirely the lower side 
of the leg, and is inserted into the outer side of the end of the tibia ; it emits a branch 
to the inner side of the distal half of the femur, which has the function of an adductor 
femoris. The other, more slender, portion is entirely on the hinder side of the leg ; its 
fibres are confluent with those of the larger portion, near their origin ; another portion 
* This head is described by Dr. Haughtox as M. glutceus maximus, in the Crocodile (Ann. & Mag. Nat. Hist. 
1865, vol. xvi. p. 327). It has in the Crocodile exactly the same anterior position, the same origin, and the same 
extent as in Hatteria (and other Lizards) ; but it is somewhat more feeble. It passes into the tendon of the 
extensor cruris (ligamentum patellce proprium), from which it can be severed only artificially ; moreover it is 
one of the chief extensor muscles of the lower leg. For these reasons I cannot adopt Dr. Haughton’s deter- 
mination, but I regard it as the rectus portion of the extensor cruris quadriceps. A M. glutceus magnus is not 
developed in Saurians. Also Buttmanx (‘ Dissert, de Musculis Croeodili,’ dedicated to Meckel) describes it as 
a part of the extensor ( vastus externus ), and does not mention a glutceus magnus. What I have described as 
the second and slender head of the extensor, and has also by Btjttmaxx been identified with the vastus internus, 
is named M. rectus by Dr. Haughton. In Hatteria it passes simply into the ligamentum patellce, and there is 
no connexion with any of the muscles of the calf of the leg. 
t This muscle might be taken for the psoas ; but its origin is far distant from the vertebral column ; indeed 
a psoas descending from the lumbar region to the humerus is not developed in Hatteria. 
