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 au 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 peronei 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- 



Fiic- 4. 



-A? 



JLM. 



Sm. 



Myology of Water-Opossum. 



Z, iliacus ; 8., sartorius ; P.P., psoas parvus; P., pectineus ; J. i?., adductor 

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

 S.m., semimembranosus; ISt., semitendinosus; B., biceps; Q.F., q}iB,di- 

 ratus femoris ; O.E., obturator extcriius ; 1. G., inferior gemellus ; G.Me., 

 gluteus medius; CM'., gluteus minimus ; &.$., gluteus quartus ; R.F., 

 rectus femoris ; C, coccygeus ; S.6r., 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 annularis. 



Pkoc. Zool. Soc— 1885, No. II. 2 



