370 PBOF. K. VON BABDBLEBEN ON THE [A-pr. 17, 



c. RODENTIA. 

 1. SoiUEUS AEizoNENSis. (Plate XXI. fig. 4.) 



(Zool. Soc. Gardens.) 



The new. plantaris tnedialis supplies all 5 toes except only the 

 outer half of the 5th. 



An abductor {extensor) 2^rcehallucis {tibialis medialis) (v. Bathy- 

 erc/us) is present ; it takes origin from the inner (tibial) surface of 

 the tibia and ends in the Ph. ; the muscle is covered in by the 

 tibialis posticus. Nerv. tibialis. 



The plantaris arises in common with the lateral head of the 

 rfastrocnemius ; it is a little fixed on the calcaneum and ends in 

 four tendons, which are provided with a weak fleshy belly each 

 ( = lumbricales ?). 



2. SCIUEUS NIGBE. 

 a. Flexor es. 



The gastrocnemius is a two-headed, strong, and flat muscle ; it is 

 inserted into the tuberos. calcan. 



The plantaris is large; it arises from the external condyle, 

 becomes tendinous near the calcaneum, where it is fixed by con- 

 nective tissue, and is inserted by four tendons into toes 2-5. 

 These tendons are cleft and perforated by those of the flexor 

 longus. 



A muscle {soleus'i) taking origin from the capitulum fibulae joins 

 the tendon of the gastrocnemius. 



The two flexores longi are united into one muscle coming from 

 the tibia and fibula and ending in five tendons. One tendon of the 

 flexor communis joins the tendon of the plantaris which goes to 

 the 5th toe. 



There are present four large lumbricales muscles. 



The tibialis posticus is inserted into the navicalare tibiale. 



The abductor (extensor) prahallucis {tibialis medialis) arises from 

 the internal surface of the tibia (in the upper half) and is inserted 

 into the Ph. and the first metatarsal bone and phalanx I. of the 

 hallux. 



There are &ve flexores breves profundi. 



jD. Extensores. 



The tibialis anticus is so very large that it covers the ext. hall. I. 

 and ext. dig. com. I. in the upper part of the leg. 



There are four peroncei muscles : — (1) the peronceus longus ; 

 (2) the peronceus brevis, both very strong ; (3) the peronceus 

 " tertius," arises from the fibula (upper eud) and goes to the 

 capitulum metatarsi quinti ; (4) the peronceus " quartus " takes 

 oi'igin from the middle and lower third of the fibula and joins the 

 outer border of the extensor digitorum brevis. 



The extensor brevis goes to toes 2-5, the tendon to the fifth toe 

 being very delicate. 



