Vol. 4] Furlong. — Preptoceras, a New Ungulate. 



107 



The superior dental series on the left side is nearly complete, 

 with the last deciduous molar about to give place to the perma- 

 nent tooth, thus making the individual probably two years old. 

 The crowns of the teeth are unworn and present in general the 

 form seen in the Ovinae. They are hypsodont with no cement. 

 In the deep groove at the confluence of the walls of the inner 

 crescents of the molars there is a very small accessory style which 

 is not present in Euceratherium. The inferior promolars of the 

 left side are missing, but those in the right ramus are present. 

 P 3 is about to be shed, the permanent teeth just appearing above 

 the alveolar border. The second milk incisors are present and 

 the crowns of the permanent incisors visible. Their form is much 

 like those of Ovibos. 



Vertebrae.— The number of cervical and lumbar vertebrae 

 corresponds to that in the Ovinae. Their centra are not so 

 sharply keeled ventrally as in Capra and Aplocerus. They are 

 relatively shorter than in these latter genera and are much 

 heavier and robust in every way. The pre- and post-zygapophy- 

 ses of the cervicals are more like those in the domestic goat than 

 Aplocerus, in that there is no sharp lateral constriction separat- 

 ing them into distinct anterior and posterior limbs, but they form 

 an antero-posterior lamella. The lumbar and sacral vertebrae 

 closely resemble those of Aplocerus. No caudal or thoracic 

 vertebrae were present and they have been restored, the former 

 from Aplocerus, the latter from vertebrae associated with Prep- 

 toceras remains in Samwel Cave. 



Limbs and Girdles. — The scapula in Preptoceras is rather 

 heavy compared with that in Aplocerus. The acromion is not 

 produced in a convex anterior surface in its distal half as in 

 Aplocerus. 



The humerus is robust, it has a very broad head and strongly 

 developed tuberosities with a deep bicipital groove. The shaft 

 is heavy with prominent deltoid and supinator ridges. 



The radius, ulna and distal elements of the fore limb are in 

 general like those in the Ovinae, though heavier. The articular 

 facets of the carpalia are placed so as to throw the knee toward 

 the median line, resembling Bos in this respect in a greater de- 

 gree than the Ovinae. 



