XII LIST OF ILLUSTRATIONS 



3-5. (3) Interclavicle of a Parasuchian. Middle Trias from near Tan- 

 ners Crossing, Little Colorado Valley, Ariz. U. S. Nat. Mus. No. 

 2153. View from below. (4) Left humerus of a Parasuchian, 

 same locality. U. S. Nat. Mus. No. 2154, a, from in front ; &, from 

 above; c, from below. (5) Left femur, without distal end of a 

 Parasuchian, same locality. U. S. Nat. Mus. No. 2163, a, from 

 below ; ft, outline of proximal face ; e, section in middle at nar- 

 rowest place 8 



6-8. (6) Probably right astragalus of a Parasuchian. Middle Trias from 

 near Tanners Crossing, Little Colorado Valley, Ariz. U. S. Nat. 

 Mus. No. 2160, 0, from above ; h, lateral view ; c, from below. 

 (7) Dorsal vertebra of a Stegocephalian (Metoposaurid), same 

 locality. U. S. Nat. Mus. No. 2158. a, from in front ; b, from right 

 side. (8) Caudal vertebra of a Stegocephalian (Metoposaurid). 

 U. S. Nat. Mus. No. 2158, a, from below ; h, from behind ; c, from 

 left side. All figures 1 : 2 nat. size 9 



Kentbiodon pernix, a Miocene porpoise from Maryland 



By Remington Kellogg 



1-2. (1) Dorsal view of type lumbar of DelpJiinapterus ruschenbergeri 

 Cope. (2) Ventral view of type caudal of Delphinapterus ruschetv- 

 bergeri Cope x 2/3 2 



3-4. (3) Lateral view of type lumbar of Priscodelpliimis stenus Cope. 

 (4) Anterior view of type lumbar of Priscodelphinus stenus Cope 

 X 2/3 3 



5. Restoration of Kentriodon pernix, estimated as 5i/^ feet in length, 



a small porpoise of approximately the same size as the living 

 Southern porpoise, Sotalia 7 



6. Ventral or tympanic view of left periotic of Kentriodon pernix. 



X 2. Cat. No. 8060, U. S. Nat. Mus. The same numbers are used 

 on figures 6 and 7 for the following structures: 1, Fenestra ro- 

 tunda; 2, F. ovalis; 3, cerebral orifice of Aquaeduetiis cochleae; 

 4, cerebral orifice of A. vestibuli; 5, processus anterior petrosi ; 6, 

 fossa for head of malleus ; 7, semiclosed canal for facial nerve ; 

 8, epitympanic orifice of A. Fallopii; 9. fossa for Stapedial muscle ; 

 10, processus posterior petrosi (Mastoid process in part) ; 11, 

 internal acoustic meatus ; 12, foramen centrale ; 13, foramen sin- 

 gulare ; 14, entrance to A. FaUopii ; 15, Fossa incudis 24 



7. Internal or cerebral view of left periotic of Kentriodon pernix x 2 — 26 

 8-20. Left malleus, incus, and stapes of Kentriodon pernix. X 5. 

 Cat, No. 8060. The same abbreviations are used on Nos. 8 to 20 

 for the following structures : c, b., crus breve ; c. I., crus longum ; 

 f., articular facet ; f. p., foot plate of stapes ; h., head ; *. a., inter- 

 crural aperture ; I., lamina ; mn., manubrium ; p. a., processus 

 anterior ; p. m., processus muscularis ; sc, scar for insertion of 

 stapedius muscle ; t., tubercle ; ii., umbo. Fig. 8, external view 

 of malleus ; 9, ventral view of malleus ; 10, dorsoexternal view of 

 malleus and incus in position ; 11, ventrointernal view of malleus 

 and incus in position ; 12, internal view of malleus ; 13, dorsal 

 view of malleus ; 14, ventral view of incus ; 15, external view or 

 base of incus ; 16, internal view or head of incus ; 17, posterior 

 view of incus ; 18, posterior view of stapes ; 19, vestibular view 

 or footplate of stapes ; 20, head of stapes 29 



