EXPLANATION OF PLATE XLIL 



Fio. 1. Maxillary and iialatine arches of Porthcus Icstrio, from Trego County, Kausas: displaying the 



jiremaxillary, uiaxillary, etbmoid, prefrontal, sclerotic, palatine, malleolus, ectopterygoid, 



pterygoid, and met.apterygoid bones. One-half natural size. 

 2. Lower part of scapula, with adjacent parts of clavicle ; the former with inferior articulation of 



pectoral spine; one-half natural size. 

 ■i. Upper part of the same scapula, showing two scpe:ior articular facets and two posterior fossaj 



for basilar bones. 



4. External view of the pectoral spine and rays, and scapula of Pof(AeHS-like Saurodoxt, the artic- 



ulation slightly dislocated to show the three facets; one-third natural size. 



5. Internal view of the inferior part of the scapular arch of an allied species, exhibiting the scap- 



ula and coracoid and foramen inclosed by them, the three lacets, and two cotyli; one-half 

 natural size. 



6. Apsojyelix suuriformin, Cope, type-specimen from Brookeville, Kansas. 



7. Tooth of Enchodiis yladiolus., natural size; a, section of base, natural size. 



8. Scales of a Clasles, from the Milk River, Saskatchewan, natural size ; a, edge-view. 

 Figs. 9-10. Lamna macrorluza, Cope, from Books Connty, Kansas ; natural size. 



11-12. Lamna mudgei, Copo. 



