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PR. J. MURIE ON THE THREE-BANDED ARMADILLO. 125 



belonging to the ^roup rather than a generic distinction. The trochanters 



are 



equally large, the 3rd rather low in position. The inner, larger condyle descends 

 furthest. The patella is elongate and narrow. 



Tibia and fibula are coossified at either extremity. Their proximal articular surface 

 is convex, with a mesial sulcus ; their thin distal end biconvex, or with a middle ridge. 

 An external and an internal malleolus are fairly developed. The former fits into a 

 grooved facet on the outer border of the astragalus ; the latter clasps the said bone 

 behind. There is considerable lateral compression of the tibial and fibular shafts. 



As respects the 5 -toed hind foot, departure from the normal type is less obvious than 

 in the manus. The calcaneal process is of medium lensrth, and has a slight inward 



QW.., ^^^ „«„ « „^. 



swerve. The inner border of the naviculare sweeps broadly round the astragalus ; and, 

 as Owen observes, its plantar aspect is doubly knuckled. Upon the outer one of these 

 and an inferior tuberose enlargement of the cuboid are two opposing facets and a narrow 

 gutter ; in this the deep-keeled surface of the strong plantar sesamoid slides. Subsidiary 

 sesamoid ossicles underlie each phalangeal j oint. 



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Some measurements of the long bones of the extremities. 



inches. 



Scapula. — In extreme length (coronoid process to vertebral border) 2"35 



Greatest width of vertebral border • • . I'^fj 



Diameter^ tip of coracoid process to anterior vertebral corner . . • • 1'65 



Humerus. — Extreme long diameter 1'8 



Ulna. — In extreme length .•.,,♦ 2'1 



Its olecranon process, tip to upper edge 0*7 



Radius. — Upper articular surface to end of styloid process ......... r37 



Manus. — Greatest length, viz. of wrist-joint to point of claw phalanx of mid digit . 1'7 



Femur. — In extreme length • 2'(*>T) 



Perpendicular height, summit of head to end of inner condyle .... 2'3 



From upper end of 3rd trochanter to lowest point of outer condyle . . . IS 



2-35 



2-3 



Tibia. — In extreme length . . . . 



J 



Fibula. — Head to malleolar extremity 



Pes. — Greatest length, viz. end of tuber calcis to tip of mid ungual phalanx . . . 1'7 



h 



VIII. Considerations respecting the Relations of Tolypeutes. 



Without attempting a comparison of all the minutiae, I shall be content to glance at 

 the points indicative of alliance, or expressive of functional correlation. The gi^oup 



Loricata, including the famiHes Dasypodid^ and Glyptodontidse, is in some ways a 



natural and well-defined one. Nevertheless in it characters crop up directins:, like 

 finger-posts, to other family relationships. Whilst the Glyptodontes exclusively belong 

 to the postpliocene epoch, some of the Dasypodes, on the contrary (exemplified by the, 

 genera Euphractua and Tolypeutes), disinterred from the same strata, have survived up 

 ^ the present time, and that, it seems, without perceptible variation in their organi- 

 zation. From this it may be inferred that the bulkier forms have been exterminated 

 ^y undetermined causes, which agents have not succeeded in altering or decimating the 

 iindersized genera. The contemporaneous existence of the two sorts invaUdates the idea 



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