484 



B.— Muscles of the Knee Joint. 



Opossum. Phalanger. 

 Oz. Av. Grs. 



220 



1. Rectus femoris, . ... 0 ' 1 3 



2. Vasti, 0*27 ..... 



3. Sartorius, 0*05 ....... 35 



4. Gracilis, 0-11 60 



5. Semi Membranosus, 0'16 150 



6. Semi Tendinosus, . . . 0'08 77 



7. Biceps femoris . . . . 0'13 110 



N. B. — The Psoas parvus in Phalanger weighed 33 grs. 



C. — Muscles of the Ankle and, Foot (Opossum). 



Oz. Av. 



1. Gastrocnemius et Solseus, 0'09 



2. Plantaris, 0*02 



3. Flexor dig. longus (perforans), 0 "06 



(Distributed to five toes). 



4. Tibialis posticus, 0'02 



(Inserted into near and inner side of the metatarsal of hallux). 



5. Flexor hallucis longus, „ 0.02 



(Inserted into tarsal bones of hallux). 



6. Peronaus longus, 0*03 



7. Tibialis anticus, 0 '03 



8. Extensor dig. communis, 0*01 



(Four tendons). 



9. Extensor hallucis, , 0"01 



(Inserted into near end of first phalanx of hallux). 



D. — Muscles of Shoulder (Opossum). 



1. M. trapezius, 0-25 oz. 



Arises from the occiput, all the cervical, and all the dorsal vertebra?, 

 except last ; inserted into outer half of clavicle, acromion, whole spine 

 of scapula, and vertebral edge of same. 



2. M. rhomboideus, 0*07 oz. 



Origin ; occiput and spines of all the cervical and first six dorsal 



vertebras. 



3. M. sterno-cleido-mastoideus, 0-07 oz. 



Origin from top of stern am and inner third of clavicle. 



4. M. omo-atlanticus, 0*03 oz. 



Arises from anterior fifth of spine of scapula; and is inserted into 

 the transverse wing of the atlas. 



5. M. serratus magnus, 0*23 oz. 



Cervical vertebras, 2 — 7 ; and ribs, 1 — 8. 



6. M. levator anguli scapula, 0-02 oz. 



Origin ; from under surface of the wing of the atlas. Insertion ; 

 into the end of the spine of the scapula. 



