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DR. J.. MURTE ON THE THREE-BANDED ARMADILLO. 101 



pulation the presence of a peroneus tertius and p. qninti digiti. They are very delicate, 

 but nevertheless clearly appreciable. They arise by sparse muscular fibres from the outer 

 posterior surface of the external lateral ligament of the knee-joint, appearing continuous 

 with the p. brevis. Their fine tendons continue downwards along with that of the 

 p. brevis, and, after passing the outer malleolus, continue along the outside of the foot. 



Ap. longus, p. brevis, and p. quinti digiti have been alluded to in the Armadillo by 

 Huxley and Macalister. Galton (p. 559) more specifically describes a p. longus and 

 pp. brevis and tertius in the D. sexcinctus. The two latter are united above, have 



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femoral, patellar, and fibular attachments : the tendon, which terminates under the 

 5th metatarsal, he ascribes to p. brevis ; the other, which is inserted outside the proximal 



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phalanx of the same digit, he regards as that of p. tertius. Hyrtl assigns a p. longus 



and p. brevis to Chlamy dopJiorus {I. c. p. 42). 



. There are two heads, as usual, to the gastrocnemius ; and its insertion below is the os 



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calcis. This muscle is of considerable size, and offers no variation in other Armadillocs, 

 though, by including the soleus, Macalister makes it appear as three-headed {I. c. p. 65). 



The plantaris arises along with, but beneath, the external head of origin of the 

 gastrocnemius. It has a strong muscular belly, but is so incorporated with the gas- 

 .trocnemius as to be with difficulty separated until, becoming tendinous, about halfway 

 down the leg. Its tendon, a long round one, passes to the inner side, and is inserted 

 into the os calcis, the plantar fascia not being a continuation of it as in Dasijpus sex- 

 cinctus. The largest of the three muscles of the calf is the soleus. It is llcshy for the 

 whole length of the fibula and head, some of its fibres, the deepest, reaching the os 

 calcis ; and these are tendinous superficially. The soleus is in apposition deeply with 

 the combined flexors (f. com. and f. long, hallucis), which lie to its inner side. It is similar 

 in the 6-banded Armadillo ; and Hyrtl notes in C, trimcatus four plantar fascicular 

 fasciae proceeding to the sole of the foot, aiding the long digital flexorcs (/. c. 41). 



In Tolypeutes the superficial plantar fascia is strong, and has attachment to the os 

 calcis and inner malleolus. It entirely covers the sole, being firmly adherent to the 

 plantar sesamoid bone and vessels, as also the tendons of the deep flexors. It sends 

 sHps more or less to all the digits ; the second and third only are perforated. In i). 6- 

 cinctus the plantar fascia, a continuation of the plantaris muscle, has a trifid division on 

 the sole, the hallux and 2nd and 3rd dibits being acted on by its tubular prolongations. 



The 



In relation to the other muscles of the calf of the leg, the pophteus is large. At the 

 usual origin on the outer femoral condyle there is a small sesamoid bone, 

 of the popliteus is continued nearly halfway down the inner posterior aspect of the tibia. 

 Although Mr. Galton speaks of a double head to this muscle in the 6-banded Armadillo, 

 as does Hyrtl, in Chlamy dophor us, neither makes allusion to its containing a sesamoid ; 

 and Macalister distinctly avers there is none in Dasypus, 



Flexor longus hallucis and flexor communis digitorum are conjoined. Their fleshy 

 helly, of moderate bulk, occupies the whole of the posterior surface of the interosseous 

 membrane, and about the middle fourth of the shaft of the tibia. Together the muscles 

 form a strong tendon, a little above the malleolus. This lies in the deep groove of the 



