A. LEITH ADAMS ON MALTESE LAND-TORTOISES. 



185 





T. robusta. 



B. C. S. 

 No. 1021 b. 



T. cphijp- 

 pium. 



Length by callipers 



millim. 

 66 



92 



55 



72 



millim. 

 60 



82 



50 



70 



millim. 

 43 



60 



35 



52 



Length by tape 



Breadth by callipers 



Breadth by tape 





I have given the chief measurements of tig. 4 in my former paper. 

 Suffice it to state, as to the comparative dimensions, that the fossil 

 exceeds in size any recent femur I have been enabled to examine, 

 and shows that the owner was a gigantic tortoise, but possibly not 

 quite so large as the owner of the coracoid just described. 



A distal extremity of a right femur, comparable as regards 

 dimensions with the form to which I assign the name of T. Spratti, 

 is also from Mnaidra Gap. It is relatively small as compared with 

 the same part in the immature skeleton (No. 1011 of the Museum 

 of the Royal College of Surgeons) referred by Giinther to T. ele- 

 phantopns *. The breadth of the condyles in the last is 78 milli- 

 metres, whereas it is only 56 in the fossil. In the latter there is a 

 shallow depression above the condyles superiorly, and a deep pit at 

 the same point on the opposite or inferior side. The condyles are 

 stouter relatively and more confluent than in T. ephipphim, and 

 more like what obtains in T. vidua ; the specimen, however, is too 

 fragmentary for precise determination. 



The small right femur from Zebbug (Plate VI. figs. 5, 5a, 5 b) has 

 lost its distal extremity. The head is elliptical, and confluent with 

 the great trochanter, and is at the same level. The great trochanter 

 (fig. 5 a), as in the large femur, is separated by a deep notch from 

 the lesser trochanter, the enclosed pit (fig. 5 b) being almost circular. 

 The largest diameter of the head is 12 millimetres, and the least 

 girth of the shaft is 18 millimetres. In T. grceca there is no notch, 

 the shaft is less bent, and the trochanters are more convergent. 

 Although somewhat larger than a femur of Lutremys europcea (46 

 millimetres in length), it agrees with it in every respect, in common 

 with the humerus (fig. 6), both of which therefore may be accepted 

 provisionally as belonging to that species. 



Tibia. 



The two tibia?, right and left (Plate V. figs. 3, 3 a, and Plate VI. 

 figs. 4, 4 a) are from Zebbug. The larger, or right tibia (Plate V. 

 fig. 3), is not entire, having lost portions of the head on its outer 



* Op. cit. p. 261. 



