1877.] J-7 * [Cope. 



Measurements. M. 



Depth of maxillary behind condyle 047 



at " 053 



" preniaxillary 069 



Length ' ' at middle 037 



Four functional niaxillaries in 020 



This species is dedicated to my friend Prof. G-. Brown Goode, of Middle- 

 ton, Conn., collaborator of the Bmitnsonian institution. 



I may here state that another very distinct species of this genus is the 

 Iehthyodectes arcuatus (Portheus accuatus Cope. 4to Report U. S. Geol. 

 Surv. Terrs. II. p. 204). It is characterized by the attenuation of the bones, 

 of the face, and jaws, and the small size and large number of its teeth. 

 Those of the maxillary bone are so small as to become obsolete on the 

 posterior half in old individuals. 



ICHTHYODECTES ACANTHTCUS Sp. nOV. 



The smallest species of the genus, distinguished by the attenuated and 

 curved crowns of the teeth. It is represented in my collection by portions 

 of the dentary, parasphenoid, and other bones. The teeth on the anterior 

 part of the dentary bone are nearly round in section, and their enamel is 

 smooth. The crowns are curved inwards towards the apices, which are 

 slender and acute. The anterior tooth is on the extremity of the dentary. 1 

 The lateral processes of the parasphenoid are wide and flat, and are pierced 

 at the base by the usual two foramina. The interorbital portion of the 

 bone is concave in the section of its inferior surface. 



Measurements. M. 



Length of the crown of a tooth 005 



Diameter " " " 001 



Five mandibular teeth in 012 



Width of parasphenoid at middle 006 



Depth of parasphenoid at middle 004 



This species and the last described were obtained by my assistant, Chas. 

 H. Sternberg, from the chalk of the Cretaceous No. 3 of Kansas. 



Oricardinus tortus gen. et sp. nov. 



Gliar. gen. Teeth inserted in shallow aveoli, with the roots more or 

 less exposed ; on the posterior half of the maxillary bone unequally so, so 

 as to be pleurodont. The anterior part of the maxillary bone depressed, 

 with superior articular facet, and united with the preniaxillary by a ging- 

 lymus. 



This genus is apparently nearly allied to Pachyrhizodus as I have de- 

 fined it. In that genus the anterior maxillary teeth are strongly pleuro- 

 dont, and the maxillo-premaxillary suture is squamosal. To Orieardinus 

 must probably be referred the P. sheareri m. 



Char, specif. This is derived from a right maxillary bone and a num- 



PROC. AMER. PHILOS. SOC. XVII. 100. W. PRINTED NOV. 20, 1877. 



