1885.] 



MYOLOGY OF THK WATER-OPOSSUM. 



17 



fourth and fifth toes, but in left foot I easily traced it to outer side 

 of first phalanx of fourth toe. The latter muscle had an ex- 

 ceedingly slender tendon, which I traced in the right foot to the 

 outer side of the third toe, but in the left foot I could not trace 

 it beyond the fascia of the ankle. All the perouei tendons pass 

 behind the malleolus. 



Extensor brevis digitorum. — Arises from outer side of ankle and 

 apex of fibula. It divides into two (?) tendons, which pass to inner 

 toes and form a tendinous expansion at metacarpo-phalangeal joint 

 with tendon of long extensor. 



Muscles of Foot. 



Dorsal Layer. — Abductor minimi digiti consists of two parts- 

 one arising from under surface of os calcis, the other from annular 

 ligament ; both are inserted into outer side of base of first phalanx 

 of minimus. 



Abductor ossis metatarsi minimi digiti. — Arises from under sur- 



GJVfe. 



G.Mz. 



JlJd. 



Sm. 



Myology of Water-Opossum. 



/., iliacus ; S., sartorius ; P.P., psoas paryus ; P., pectiiieus ; A.B., adductor 

 brevis ; A.L., adductor longus ; G., gracilis ; A.M., adductor luagnus ; 

 S.m... semimembranosus; St., semitendiuosus ; B., biceps; (J.i^., quad- 

 ratus femoris ; O.E., obturator exteriius ; I. G., inferior gemellus ; G.Me., 

 gluteus medius; ff.Afi., gluteus minimus ; G^.Q., gluteus quartus ; R.F., 

 rectus femoris; C, coccygeus; S.G., superior gemellus. 



face of OS calcis external to above. Inserted into outer side of base 

 of metatarsal of minimus internal to insertion of peroneus brevic. 



Abductor annularis. — Arises from base of metatarsal of minimus, 

 cuboid, and sheath of peroneus longus ; inserted into outer side of 

 base of first phalanx of annulaiis. 



Pkoc. Zool. Soc— 1885, No. II. 2 



