40 



PORTHEUS THAUMAS, Cope ; Saurocejjhalus thamnas. Cope, Proceed. 

 Amer. Philos. Soc, 1870, November; loc. cit, 1872, 335. 



Same locality as the last. 



PoETHEUS LESTEio, Cope, Proceed. Academy Natural Sciences, Phila- 

 delphia, 1873, 337. 



Mobrara Cretaceous of Kansas near the Solomon Eiver ; abundant. 



PORTHEUS MUDGEI, Sj). UOV. 



Eepresented by portions of the jaws with vertebrae of a single indi- 

 vidual discovered by Prof. B. F. Mudge, in Trego County, Kansas. The 

 prominent character is seen in the possession of four subequal teeth in 

 the premasillary bone, which therefore presents a relatively long alveolar 

 border for their accommodation. The bone is also more massive than 

 in the other species, and is peculiarly thick on the free inner edge- 

 There are five or six subequal large teeth behind an edentulous space 

 on the maxillary bone, while those on the posterior part are small. The 

 specimen is smaller than is usual in other species of the genus. 



Measurements. 



:m. 



Width of premaxillary bone .054 



Elevation of premaxillary^ bone above first tooth 060 



Thickness of premaxillary bone at middle 021 



Depth of maxillary at condyle. 057 



Depth of maxillary at fifth large tooth ■. . .040 



Xiength of basis of five large teeth 03ft 



Length of an anterior vertebra 019 



Diameter \ ^^^^^J^al 031 



' ( transverse 031 



Occasionally the Portheus lestrio exhibits one or even two minute ad- 

 ditional premaxillary teeth, but the three large teeth always remain a 

 distinction from the four large ones of the P. mudgei. 



Portheus gladius. Cope, Proceed. Acad. Fat. Sci. Philadelphia, 



1873, 338. 



Eepresented by a huge pectoral spine, which may belong to one of the 

 preceding species. 



Mobrara Cretaceous of the Solomon Eiver, Kansas. 



ICHTHYODECTES, Cope. 

 Proceed. Amer. Philos. Society, 1870, ]N"ovember; loc. cit, 1872, 33S- 



ICHTHYODECTES ANAIDES, Cope, loc. cit, 1872, 339. 



Mobrara Cretaceous of the Smoky Hill. 



ICHTHYODECTES CTENODON, Cope, loc. Git., 1870, November: loc. cit!' 

 1872, 340. 



Mobrara Cretaceous of the Smoky Hill. 



ICHTHYODECTES HAMATUS, Cope, loc. clt., 1872, 340. 



Mobrara Cretaceous of the Smoky Hill. 



