1872.] DR. W. PETERS ON SMALL ANGOLAN MAMMALIA. 363 



flexor magnus, passes through the lesser sesamoid sheaths, and is in- 

 serted into each of the three proximaal phalanges of the external toe. 



Flexor profundus arises by two heads — one from the posterior 

 surface of distal end of femur, the other from the posterior surface 

 of the upper half of the tibia and part of the fibula. The tendon of 

 the external muscle passes at the tibio-tarsal joint through a canal 

 in the tendon of gastrocnemius anticus. The inner tendon does not 

 enter the gastrocnemial sheath till below the joint ; it passes down 

 the inner surface of the contiguous ends of the tibia and the tarso- 

 metatarsal bone, bound down to them by a special aponeurotic sheath, 

 and joins the outer tendon near the tarso-phalangeal joint. Thecommon 

 tendon passes over the sesamoid pulley, piercing the flexor magnus 

 tendon ; it js here much thickened and hardened, and fits into the 

 grooved and thickened tendon of flexor perforans. It is inserted into 

 the fourth phalanx of the internal toe, sending off a short strong slip 

 to the third phalanx, and an elastic slip to the second phalanx, as 

 well as a small but long slip to flex the fifth phalanx of the external 

 digit. 



Mr. Macalister describes the tendon of the flexor profundus as 

 being inserted only into the last phalanges of both digits ; the inser- 

 tion, as it was in my specimen, accords, I believe, with the usual 

 condition of this tendon in birds. 



The flexor interosseus is a delicate and weak muscle, which con- 

 sists of numerous very short oblique fibres arising from the posterior 

 surface of the tarso-metatarsal bone, and inserted into an aponeurosis 

 stretching the whole length of the muscle ; this aponeurosis ends in 

 a tendon which is inserted into the outer surface of the first phalanx 

 of the external digit. Its action appears to be to abduct and flex the 

 toe. 



A small muscle which Mr. Macalister does not describe, but 

 merely mentions as probably representing the dorsal interosseus, 

 arises from a small triangular space on the anterior surface of the 

 distal end of the tarso-metatarsal bone, and is inserted into the cap- 

 sular ligament of the tarso-phalangeal joint. There were some dif- 

 ferences between the specimen which I dissected and that described 

 by Mr. Macalister, in the precise origin of some of the muscles, which 

 I have not thought to be worthy of note. 



The extensor communis digitorum presents no peculiarities ; the 

 very small extensor unguis mentioned by Mr. Macalister was present. 



3. Note on a Collection of small Mammalia made by Mr. 

 Monteiro in Angola. By Dr. W. Peters, F.M.Z.S. 



[Received February 13, 1872.] 



Mr. Sclater has sent to me for determination a collection of small 

 Mammals made by Mr. J. J. Monteiro, C.M.Z.S., during his last 

 travels in Benguela and Cambembe. The collection contains ex- 



