392 B. S. Lull— New Camels in 



Akt. XXVI. — Neiv Camels in the Marsh Collection; by 

 Richard S. Lull. 



[Contributions from the Othniel Charles Marsh Publication Fund, Peabody 

 Museum, Yale University, New Haven, Conn.] 



The Oligocene camels in the Marsh Collection consist 

 of a number of skulls and other skeletal material. Those 

 from the White River Oreoclon beds are clearly referable 

 to three of the known species of Poehrotherium and add 

 nothing to our knowledge of these forms. From the Pro- 

 toceras beds, on the other hand, comes one apparently new 

 species, while from the upper John Day are several speci- 

 mens wortlw of description. 



Pseudolahis (Paralahis) mafthewi, subgen. et sp. nov. 



(Fig. 1.) 



Holotype, Cat. No. 10167, Y. P. M. Upper Oligocene (Protoceras beds), 

 Sturgis, South Dakota. 



The type material consists of a poorly preserved skull 

 with the third incisor and a complete series of cheek teeth. 



Distinctive characters. — Size somewhat larger than 

 Poehrotherium labiatum. Skull mutilated so that few 

 characters are observable. Auditory bullcE less rounded 

 than are those of Poehrotherium, although fully as large. 

 Tympanohyal recess more widely open and inner poste- 

 rior lobe thus narrower, more as in the later camels. Rear 

 of orbit not preserved, but zygomatic arch and adjacent 

 bones are rather heavy, so that its closure is probable. 

 Infra-orbital foramen above P^, palatal foramina oppo- 

 site the posterior half of P-^ 



Dental formula: P^ C\ P% M\ Alveoli of P- not 

 preserved, 1^ caniniform, recurved, probably equal to, if 

 not exceeding, the canine in size. Canine lacking, alveo- 

 lus elliptical, separated from I^ by a short diastema. P^ 

 double-rooted, crown not preserved, larger than P-, and 

 separated from the adjacent teeth by diastemata, of which 

 the anterior one is nearly two times the greater. P^ to 

 M'^ form a compact series, the crowns of medium height. 

 Molars with prominent parastyle, mesostyle, and external 

 ribs, no internal basal pillars present. P^ with internal 

 cingulum, and P^ with an accessory internal crest con- 

 necting the crescent with the rear of the tooth, suggestive 



