586 General Notes. [August, 



>ides posteriorly. The tubercles are appressed as in the first 



sive, .060. Length from do. to fourth premolar, .025. Diameters 

 M. 1, anteroposterior, .019, transverse, .009; diameters M. II, 

 anteroposterior, .012, transverse, .010; depth of ramus at middle 

 of diastema, .024; depth of ramus at middle of M. 1, .033. — 

 D. Baldwin. 



Ptiloius trovessartianus, sp. nov.— This species is represented 

 by three of the characteristic fourth inferior premolars, one of 

 which stands on a part of the ramus, giving its depth. These 

 differ from those of the P. mediaevus in their uniformly smaller 

 size, and in their strongly serrate posterior edge. The number of 

 lateral edges is 12, as in P. mediaevus. Length of fourth pre- 

 molar, M. .0055; elevation of do. .0040; depth of ramus at P.-m. 

 iv, .0057. Discovered by D. Baldwin. Dedicated to the dis- 

 i mammalogist, Dr. E. L. Trouessart, of Angers. 



Haploconus entocomts, sp. nov. — The largest species of the genus, 

 represented by a right maxillary bone* supporting the last five 

 molars. The peculiarity which distinguishes it from the H. lineatus 

 is the conical form of the internal lobe of the fourth premolar, 

 which is in the H. lineatus, flat and concentric in section. Further, 

 the posterior inner or cingular cusp of the true molars is extended 

 further inwards than in that species, giving the crowns a greater 

 transverse extension. The posterior molar has the posterior 

 external angle less developed than the other molars. The third 

 premolar is a robust cone with subtriangular base. 



Measurements.— With base of P.-m. in, m. .007; of P.-m. IV, 

 .008; length of base of do. .0055 ; width base M. 1, .0085 ; length 

 do. .0050. Puerco beds of New Mexico. D. Baldwin. 



Haploconus gillianus, sp. nov.— A small species of the size of the 

 //. angustus, but having the same peculiarity of the fourth 

 superior premolar as the H. entoconus, i. e., with the internal lobe 

 conic. That tooth is also relatively smaller than in the H. entoconus, 

 and has an anterior basal external tubercle not found in that 

 species. The inferior true molars have an anterior median 

 tubercle which is not found in the //. angustus and //. xiphodon y 

 and the external anterior cusp has not the compressed form 

 general in the genus. 



Measurements.— Diameters superior P.-m. iv, anteroposterior 

 .0033; transverse, .0046. Diameters superior M. 1; anteropos- 

 terior .0040 ; transverse, .0060. Length last two inferior molars, 

 •°°93 J length of last inferior molar, .0050. Depth ramus at M. Hi 

 .0085. From W. W., New Mexico. D. Baldwin. Dedicated to 

 my friend Prof. Gill, of Washington.—/:'. D. Cope. 



Geological News.— In Vol. xv, Part 1, of the Geological 

 Survey of India, R. Lydekker, F.Z.S., describes the tnass.c 



