SYNOPSIS OF THE VEKTEBRATE FAUNA OF THE PUERCO SERIES. 349 



have already supposed (Tertiary Vertebrata), and that the inferior dentition repre- 

 sented in my Plate XXV e, fig. 6, as the milk dentition of that species, is not such, but 

 is the permanent dentition of the //. Imeatus. The [uvmolars in question are much 

 worn, so that the absence of the last true molar is jirobably due to accident rather 

 than to non-protrusion. A second specimen of the //. xijjhodon confirms its char- 

 acters. 



Additional speciniciis of the AnUoiiclms cop/iatcr show lluiL it is i'i>lc'i:ii)lr to this 

 genus. This, with the new //. corniculatus, increases the species oi" llaploconus 

 to six. 



nAPLOCONrs con^•ICCLATDs Cope, sp. no v. 



Five more or less complete crania and a set of jaws repiesent this species. Its 

 characters are to be seen in its peculiar superior molar teeth, and in its superior size. 



The species presents the general chaiacters of the H. iineatus, especially as to 

 the form of its first premolar, which has the internal cusp an elevated concentric cin- 

 guhim, and its enamel vertically striated with shallow grooves. The anterior cingu- 

 lum of the tiue molars however terminates at its interior extremity in an acute erect 

 cusp which is wanting in the //. Iineatus, and the cusp of the posterior ciiigulum is 

 isolated by a notch of the lattei-, Avhich develops a second lower cusp immediately 

 posterior to the first mentioned. This second posterior cusp is seen on the jwsteiior 

 molar of the H. lineaias, but not on any of the others. The dimensions of the 11. 

 corniculatus are constantly superior to those of the //. Iineatus, as the following meas- 

 urements will show. The lengths on the superior molar series to the canine tooth, in 

 three specimens of each species, are as follows : 



n. Mmiculaius 045 .043 .040 



H. Iineatus 034 .033 .035 



The skull is elongate and is narrow in the cerebral region. The sagittal crest is 

 low, as is also the iniou. The orbit is small and lateral. This canines are directed ver- 

 tically downwards. 



ifeasurements of Shell. M. 



Total lengUi r25 



Length from occipital condyle to last molar 058 



Width between last molars, inclu.sive 037 



" " canines, inclusive 020 



The inferior dentition is similar to that of the II. Iineatus, but is more robust. 



IIapi.OCOITOS COPHATER Cope. Anisonchus cophattr Cope; Pror. Amer. Pliilos. Sr)C., lRfi3, p. 321. 



This sixicies, deseril)ed from a fragment of a mandibular ramus, is now repre- 

 sented by a large part of a second ramus supporting 'Cwc teeth, ami an anterioi- pari 



