AMERICAN LABYRINTHODONTIDM 



589 



beginning farther back, and in a broader, shallower depression. 

 The posterior canals beginning in a broad, shallow depression on 

 the postorbitals, instead of on the postfrontals. Infratemporal 

 foramina much narrower; internal nares much farther frornThe 

 palatine foramina. Teeth as in A. browni. 



< • Z/ 



1. Inner view of mandible of Anaschisma brack ygnatha; one-fourth natural size, 

 a, angular; ar, articular; c, coronoid; d, dentary; ?, undetermined; pa, preartciular; s, splenial. 



2. Lateral view of skull of Anaschisma browni; two-ninths natural size, 

 c, condyle; if, infratemporal foramen; n, internal nares; pf, palatine foramina; q, right quadrate; 

 q 1 , lower end of left quadrate. 



FlG. 10 



DESCRIPTIONS OF ALL OTHER LABYRINTHODONTIDM KNOWN 



FROM AMERICA 



Metoposaurus fraasi Lucas 



Original description: 1 



The species is characterized by the coarseness of the sculpturing of the epis- 

 ternum, and the fact that the markings of the center of the plate consist of irregu- 

 lar pits which, toward the margin, are transformed into radiating grooves. These 

 grooves are most marked on the anterior portion of the bone. The portion of 

 clavicles present also have the ornamentation in the shape of pits rather than 

 grooves, and in this respect and in the greater coarseness of the sculpture the 

 present species differs from the European Metoposaurus diagnosticus of von 

 Meyer. It is, furthermore, characterized by the extent of the articulation of the 

 clavicle with the episternum, the posterior end of the clavicle being well behind 

 a line drawn through the center of the plate. The postero-inner angle of the 



1 Proceedings of the United States National Museum, 1904, Vol. XXVII, p. 194. 



