EXPLANATION OF PLATE XLIV. 



Figs. 1-4. Portheus ihaumas type, natural size. 

 Fig. 1. Part of vertebral column. 



2. Terminal vertebrae, with hannal and neural spines supporting caudal fin; a, first fan-shaped 



haemal spine. 



3. First fan-shaped hosmal spine, viewed from above; 3 a, the same, proximal articular face. 



4. Marginal rays of caudal fiu. 



5. Fragmentary pectoral spine of the type-specimen of Portheus molossus, Cope. 



Figs. 6-9. Ventral spines of a Saurodont, found together, species nuknown : 6, the first ; 7, the second ; 

 8, third ; a, opposite side of same; 9, basis of one more distal. 

 10-11. Scapula of Portheus molossus, type-specimen ; inverted. 

 Fig. 12. Pectoral spine of Pckcoplerus gladius ; a, from anterior edge. 



13. Pectoral spine of Pelecoptcrus perniciosus ; a, from posterior edge. 



14. Part of vertebral column of type of Ichthyodcctes anaides, Cope, found in position, natural size. 



15. Vertebra} of the same specimen. 



