SYSTEMATIC REVISION 15 



Diadectes phaseolinus Cope. (Plate l, figs. 6, 6a.) 



Diadectes phaseolinus Cope, Proc. Am. Phil. Soc., vol. xix, l88o, p. 46. (Also Pal. Bull. No. 32.) 

 Diadectes phaseolinus Cope, Am. Nat., vol. xv, 1881, p. 164. 

 Empedias phaseolinus Cope, Proc. Am. Phil. Soc., vol. xx, 1883, p. 634. 

 Empedias phaseolinus Cope, Proc. Am. Phil. Soc., vol. xxxiv, 1896, p. 442. 

 Diadectes phaseolinus Cope, Proc. Am. Phil. Soc., vol. xxxv, 1896, p. 132. 



Type: Described as the maxillary bones of three animals and the mandible 

 with most of the tooth line of a fourth; a single maxillary and a single vertebra 

 now preserved. No. 4349 Am. Mus. Nat. Hist. Cope Coll. From Texas. i 



Original description: "The molars possess a low cusp which is nearly in the 

 middle of the tooth. Of the lower and external cusps, the internal is wider and 

 more rounded; when unworn it is as elevated as the external, but it is soon reduced 

 by attrition. The external part of the tooth is somewhat narrowed, and there is 

 no horizontal surface on either side of the median cusp, as in Empedocles molaris. 

 The last maxillary tooth is rather small; preceding it are eight wide transverse ones, 

 and then two less extended transversely before reaching the broken end of my best 

 specimen. The anterior of these is elongate, and may be caniniform, but its apex 

 is lost. External layer smooth; some wrinkles around the base of the median cusp. 



"The broken base of the malar bone is subround and small, and shows that the 

 element is slender below the orbit. 



"The portion of the mandible preserved is quite deep, and is incurved at the 

 symphysis. But few of the teeth are preserved, and it is not possible to say how 

 long the anterior ones with subround bases may have been. The molar whose 

 crown is preserved does not ditter materially from those of the maxillary series. 

 The alveolar line does not retreat inwards from the external border as in Empedocles 

 latihuccatus, resembling in this respect the D. sideropelicus. The external surface 

 of the lower jaw is roughened by shallower and deeper small or minute pits placed 

 closely together. 



" Measurements. 



"Length of a series of eleven maxillary teeth 0.075 



Length of a series of seven widest molars 048 



Diameter widest molar: 



Anteroposterior 006 



Transverse 016 



Depth of mandible externally 050 



Width of mandible at middle 026" 



Revised description: The median cusps of the posterior molars are more coni- 

 cal, not extending across the crown of the tooth. The inner half of the tooth is 

 .swollen more than the outer; the inner cusp is larger, more rounded, and a little 

 higher than the other. The inner cusp joins the median one more sharply than does 

 the outer. 



Diadectes molaris Cope. (Plate 1, figs. 5. Sa.) 



Diadectes molaris Cope, Am. Nat., vol. xil, 1878, p. 565. 

 Empedocles molaris Cope, Proc. Am. Phil. Soc, vol. XlX, 1880, p. 47. 

 Empedias molaris Cope, Proc. Am. Phil. Soc., vol. xx, 1883, p. 634. 



Type: A fragment containing two large teeth and the base of third. No. 4347 

 Am. Mus. Nat. Hist. Cope Coll. From Texas. 



Paratype: A fairly complete skull lacking the basioccipital region. No. 4350 

 Am. Mus. Nat. Hist. Cope Coll. From Texas. 



