12 REVISION OF THE PELYCOSAURIA. 



In 1891 (77) appeared Cope's first "Syllabus of Lectures on Verte- 

 brate Paleontology" ; the classification is similar to that published in the 

 American Naturalist, but the suborder Pelycosmtria is omitted, and the 

 Theriodontia is used for a suborder including the families Clcpsydropidce, 

 Bolosauridce and Pariotichida. The suborder Cotylosauria holds only the 

 families PareiasaitrideB and DiadectidcB. 



In 1892 (79), in a discussion of the cranial arches of the reptilia, the 

 Cotylosauria was raised to the rank of an order with the genera Chilonyx, 

 Pantylus, Pariotichus, and probably Parciasaiirus. The genera Diadcctes and 

 Enipcdodcs are not mentioned, but are evidently meant to be included, as the 

 order is based on the completely roofed condition of the skull. The mem- 

 bers of this order are never again considered as part of the Pdycosanria and 

 so pass from farther consideration in this review. In this paper Cope 

 called the Thcromora a "branch" opposed to the order Cotylosauria, evi- 

 dently following Lydekker, with the two orders Theriodontia and Anorno- 

 dontia. The first includes the African Theriodontia of Owen as well as 

 Cope's Pelycosauria of previous papers. 



In the same year Seeley (122) gave a classification of the Permian 

 reptiles as follows: 



Order I. Partiasaurida. Snhorder Procotop/ionza. 



II. Theriodontia. Subordens Genneiothcria, Cotylosauria, and 

 probably Pelycosauria . 



III. Endothiodontia. 



IV. Mcsosauria. 

 V. Dicynodo7itia. 



VI. Pleurodo7itia. 



In 1894 (80) Cope published a description of the Plesiosaurian skull, 

 in which the name Pelycosauria was again used and ranked as an order 

 equivalent (?) to the Theriodontia and of equal rank with the Cotylosauria 

 and Theromora. 



In a review of some of Seeley's paper in the same year Cope explained 

 (81) that his use of the term Theriodontia iu the former paper was inad- 

 vertent and was meant to signify Pelycosauria ; that its use was due to the 

 fact "of the premature assinnption by the English paleontologists that the 

 two names were synonymous." 



In 1895 Seeley (123) placed the Theromora doubtfully in his new 

 order Therosuchia, with the Pelycosauria and Cotylosauria as subgroups of 

 equal rank, the whole distinct from the Theriodontia. 



In Bernard's Paleontologie (12) we find the following table: 

 Order Theromorphes {Anomodonts sens tat.). 



Suborders Cotylosauriens {Pareiasauriens), Procolophoniens , Theriodontes, 

 including both the Clepsydropidcs and the Diadectida-, Dicyiiodontes {sens 

 strict.), Appendice Theromorphes — Placodontes. 



