12. EMTS. 



113 



two thirds its length ; young with a distinct keel, which disappears 

 more or less completely iu the adult. Nuchal small, longer than 

 broad ; first vertebral broader in front than behind ; vertebrals 

 2 to 4 much broader than long. Plastron large, but not closing 

 entirely the shell ; width of bridge nearly one fourth the length 

 of the plastron ; the bridge formed to a lesser extent by tho 

 hyoplastron than by the hypoplastron, the peduncle of which is also 

 more developed ; hind lobe truncate or 02)cnly emarginate ; pectoral 

 and abdominal shields subeiiual in size ; the longest median suture 

 is that between the anals, the shortest (usually) that between tho 

 humerals ; axillary and inguinal shields absent or small. The 

 smallest diameter of the interorbital space equals the vertical dia- 

 meter of the orbit; upper jaw not hooked, broadly emarginate in 

 the middle ; the length of the mandible equals about four times its 

 diameter at the symphysis. Limbs scaly, extensively webbed. Tail 

 with more or less distinctly verticillate scales, about as long as the 

 shell in the young, two thirds that length in the adult males, half 

 or a little less in the females. Carapace dark brown or black, with 

 more or less numerous light (usmiUy yellow) dots or radiating lines ; 

 plastron yellow, brown and yellow, or nearly entirely blackish brown 

 in the adult ; shell of young dark brown above, black inferiorly, with 

 a large yellow spot on each marginal and on the outer side of each 

 plastral shield. Head dark brown or black, with lighter dots, which 

 are yellow in the female and pale brown in the male ; lower surface 

 of head and neck yellow, spotted with blackish. Limbs and tail 

 blackish, more or less abundantly spotted with yellow. 



Specimen h is remarkable for the predominance of the yellow 

 colour, the carapace being yellow, each shield with fine black 

 radiating lines *. 



Length of shell 19 centira. 



South Europe, East Central Europe, South-western Asia, Algeria. 



Has been found in Pleistocene deposits in Sweden, Denmark, 

 Norfolk, Belgium, Germany, Switzerland, and Lombardy. 



Sir R. Owen [P.]. 



Dr. A. Glinther [C.]. 

 AV. W. Saunders, Esq. [P.]. 

 Lord A. PtusseU [P.]. - 

 M. de Betta [P.]. 



M. F. Lataste [P.]- 

 Lord Lilford [P.].^ 



* In a young specimen from Mahon, Baleares, in M. Lataste's collection, the 

 yellow likewise predominates on the carapace. 



