ZEUGLODOXT AXD OF LEATHERY TURTLE. 319 



EXPLANATION OF THE PLATES. 



PXATE I. 



Fappocetus lucfardi, gen. et sp. nov. 



Fig. 1. Mandible, outer side. (Tj'pe-specimen M 11414.) ^ nat. size. 



2. 2(7. Outer and inner aspects of first molar of specimen M 11086. f nat. size. 



3. ? Incisor (M 11087). Nat. size. 



4. Anterior face of imperfect axis vertebra (M 11089). i nat, size. 



Plate II. 

 Cosmoclielys dolloi, gen. et sp. nov. (Type-specimen R 4338.) 



Pig. 1. Outer surface of middle portion of epitliecal shell, f nat. size. 



2. Outer face of intermediate plates of epithecal shell. Nat. size. 



3. Outer face of two lateral plates of epithecal shell, f nat. size. 



4. Vertical transverse section through thecal and epithecal shell. Nat. size. 



C.J}., cestui plate. 

 c.r., central ridge. 

 ep., epithecal shell. 

 I.r., lateral ridge. 

 It., neural plate. 

 n.sp., neural sjiine. 

 i\, rib. 



