No. 2391. DESCRIPTIONS OF PLEISTOCENE VERTEBRATA—IIAY. 631 



individual. The front half (Cat. No. 10197) is here figured (pi. 121, 

 figs. 7-9). It has been impracticable to remove all of the calcite 

 and sand, but the form of the skull is shown. From the rear of the 

 hinder tooth to the front of the snout is 28 mm.; in a specimen of the 

 living species from Nevada this distance is only 23 mm. The nasal 

 bones, the incisors, and some of the other teeth are missing from the 

 specimen figured. Figure 10 of plate 121 presents a view of a palate 

 and maxillae (Cat. No. 10198) from which the teeth have fallen. 

 The first premolar, to judge from the size of the socket, was larger 

 than the corresponding tooth of B. idalioensis. Figure 6 of the 

 same plate presents a view of the type — a palate (Cat. No. 10196) 

 in which many of the teeth are retained. Another figure (pi. 121, fig. 

 12) gives a view of the left zygomatic arch and palate, as seen from 

 below (Cat. No. 10199.). Some matrix yet clings to the bone. 

 There are present several rami of lower jaws. Figure 13 of plate 121 

 represents one of these (Cat. No. 10200) lacking the angular process. 

 From the rear of the condyle to the front of the jaw is 44 mm.; in a 

 specimen of B. idahoensis this distance is 39 mm. Another right ramus 

 (Cat. No. 10201) (pi. 121, fig. 11) presents a view of the incisor and 

 of all the other teeth except the hindermost molar. Figure 14 of 

 plate 121 is that of a right humerus (Cat. No. 10202) 45 mm. long; 

 but the animal had perhaps not reached its full size. The bone is 

 slightly shorter than the humerus of B. idalioensis from Nevada. 

 One-half of a right innominate bone (Cat. No. 10203) is shown as 

 seen from below in figure 15 <3f plate 121 . The total length is 49 mm. ; 

 that of the specimen of B. idalioensis is 46 mm. Figure 16 of plate 

 121 presents a front view of a right femur (Cat. No. 10204); figures 

 17 and 18 of the same plate show parts of two tibiae, one (Cat. No. 

 10206) lacking the epiphysis; the other (Cat. No. 10207) the distal 

 half of the bone. 



TAXIDEA ROBUSTA, new species. 



Plate 119, figs. 3-5. 



Type specimen. — A left ulna. 



Type locality. — Coconino Forest region. 



Type formation. — Early Pleistocene. 



Diagnosis. — Ulna stouter than in T. taxus. Inner face with a 

 ridge from coronoid process to distal end. Pubic bone at rear of 

 obturator foramen thicker and wider than in T. taxus. 



In the collection there is a single ulna (Cat. No. 10208), that of 

 the left side, which appears to have belonged to a species of Taxidea 

 distinct from T. taxus. This bone has lost all that part above the 

 middle of the greater sigmoid cavity, and also the head and styloid 

 process. 



When compared with the corresponding bone of T. taxus (pi. 119, 

 figs. 1, 2) the fossil is seen to be stouter. When measured halfway 



