. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 382 MONOTREMATA. and with it also the tail and the pelvic extre- mities. The psoas ma gnus and iliacus interims form a single muscle, having the usual origins, and inserted by a common tendon into the large internal condyle. The glutens externus is larger than is usually the case with quadrupeds; its tendon is inserted into the plantar fascia and the bone which sup- ports the spur. The gluteus medius, gluteus internus, pectineus (45), biceps flexor crurls, grucilis(34),sartorius(35), rectusfemoris(36), adductores femoris
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 382 MONOTREMATA. and with it also the tail and the pelvic extre- mities. The psoas ma gnus and iliacus interims form a single muscle, having the usual origins, and inserted by a common tendon into the large internal condyle. The glutens externus is larger than is usually the case with quadrupeds; its tendon is inserted into the plantar fascia and the bone which sup- ports the spur. The gluteus medius, gluteus internus, pectineus (45), biceps flexor crurls, grucilis(34),sartorius(35), rectusfemoris(36), adductores femoris (46), semitendinosus (47), semimembranosus, vastus externus, otter no notable deviations from the usual structure. A strip of fibres (49) descends from the gracilis to the sphincter cloaca (H). A muscle, called by Meckel ' flexor accessorius a cauda ad tibiam tendens' (51), arises from the transverse pro- cesses of the anterior caudal vertebrae, and converges to be inserted into the tibia. Another peculiar adductor of the leg, which might be termed ' intertibialis ' (52), is attached by its extremities to both tibia; its fleshy belly passes across the sphincter cloacae (H), and is connected with a strip of the panniculus carnosus (i). The gastrocnemius (48) derives its largest origin from the produced and expanded head of the fibula, and its smaller belly from the internal femoral condyle; its tendon is implanted in the calcaneum. The analogy between the gastro- cnemius and ulnaris interims is strikingly illus- trated in the Ornithorhynchus. The soleus arises from the head of the fibula and from a large proportion of the tibia ; it is nowhere blended with the gastrocnemius, but is inserted by a thick and short tendon into the astragalus. The abductors of the outer digits of both the hand and foot are well developed for the purpose of expanding the web which connects the toes. In the figure the following muscles of the leg are shown, viz. 37, tibiatis anticus, 38, ex- tensor h
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