SYNOPSIS OF THE VEWTKBRATE FAUXA OF TTIE PUERCO SERIES. 323 



MioCLiENns CKA8S1CUSPIS Cope. Conovjjcles crassicuapia Cope ; Terliuiy Vcrtebrata, 1S85, p. 201, PI. xxiii e, flj;. U. 



Better specimens of the Conoi'yctes comma and of this species show that there is 

 nothing in common between them. The M. crassicusj)is is allied to the M. cori/pJui'us, 

 but has a deeper ramus of the mandible and was probably a considerably larger animal. 

 The last inferior true molar is relatively of smaller size than in that species. Parts 

 of lower jaws of three individuals are in my collection. These show that the fifth 

 cusp is well developed in all of the true molars, and that the anterior part of the 

 crown is higher than the posterioi-. The type and a second specimen are from the 

 Lower Puerco ; the exact horizon of the other is unknown. 



Mioci..«Nus coKYPHiEus Cope. Sarcothraustes cor yphceus- Cope ; Amei. Naturalist, 1885, p. 38G. 



Nine individuals represent this species in my collection. The best of these in- 

 cludes numerous fragments of a skull with superior molar teeth, and a part of the 

 mandible with the second true molar in a worn condition. The mandibular rami of 

 other individuals furnish the entire inferior series. 



The crowns of the supei'ior molars support two external conical cusps which stand 

 close together, but are entirely distinct, and have a circular section. There is a 

 single internal conical cusp flattened on the external side. The entire crown is sur- 



T'" /'<" 



f a I /iijii 



Mioelimuseoryphmis.—Fig. 1. Higlit squamosnl bone, from witliin. Fig. 2. Occipital from fiont. Fig. :!. Left supe- 

 rior molars, lacking p. m. ii, iii anil iv. Fig. 4. Inferior molars lacking m. i. and p. m. iv. All from the typical 

 individual except p. m. i, ii, and iii. Figs. 1-2, seven-ninths natural size ; :5-4, about natural size. 



rounded by a well-developed cingulum, which is especially jirominent round the exter- 

 na! anterior cusp of the second and third true molars. Tlie posterior external cusp ol 

 the last true molar is rudimental, and is situated well within the external liiif on (be 

 posterior border. The fourth premolar has a single external cusp, and liii- oin.i;iilinn 

 is wantins: on the anterior and interior sides. The outline of the Ijasc of the crown 



