232 CASE. [Vol. II. 



the postorbital region ; the zygomatic arch extends low clown, 

 producing a resemblance to certain tortoises. The orbits are 

 small and lateral, and the muzzle is short, with terminal nares. 

 Their exact character cannot be ascertained. The teeth are 

 rooted, and have compressed obtuse crowns with cutting edge ; 

 they diminish in length posteriorly, and do not display any elon- 

 gate canine. The cranial bones do not exhibit any sculpture." 

 In 18S3 (3) (p. 631) this last statement was corrected: "The 

 surface of the cranium has been mostly weathered away in the 

 type of Parioticlius, P. brachyops, and I suspect that it is really 

 sculptured and not smooth, as I originally stated." 



In 1895 (4) an analytical table of the genera of the ParioticJii- 

 dae was given. In this table the genus Ectocyiwdon is united 

 with Pa rio tick us: 



I. External nostrils lateral. 

 a. Palatal and splenial teeth witli compressed 

 crowns. 



Teeth equal, acute Isodectes Cope. 



Teeth increasing gradually in length anteriorly. Captor/u'/u/s Cope. 

 Teeth enlarged on the middle of the maxillary 



and anterior part of the incisive series. . . Parioticlius Cope. 

 aa. Palatal and splenial teeth obtuse, forming a 

 grinding pavement. 

 Median maxillary and anterior incisor teeth 



enlarged Pa)iiylus Cope. 



II. External nostrils inferior. 



Mouth posterior in position, mandible short, 



and with a few acute teeth Hypopnous Cope. 



It is probable that Hdodcctes Cope pertains to this 

 family. 



In the same article (p. 443) there is given a more extended 

 description of the genus Parioticlius. " The maxillary teeth 

 display the enlarged median tooth characteristic of the species 

 referred to Ectocyjiodon, although it is less prominent than in 

 some of the latter, and it is probable that the premaxillaries 

 display corresponding enlargement. The type of Ectocynodon- 

 [E. ordinatus Cope) is in the same condition as regards teeth 

 of the premaxillary series, but a long tooth is present near the: 



