INSECTIVOEA. 209 



M. 



I anteroposterior 007 



Diameters lunar < vertical in front 006 



( transverse 005 



I anteroposterior 006 



Diameters cuneiform < vertical in front 004 



( transverse 008 



c second : 005 



Proximal -widths of metacarpals < fourth 005 



( fifth 0055 



The ilium is slightly concave longitudinally on the external face. The 



inner border is abruptly contracted near the origin of the os pubis. The 



anterior inferior spine is prominent and extended with the length of the 



ilium; it is four times as long as wide. The groove of the acetabulum is 



within the anterior margin of the ischium. The posterior edge of the pelvis 



opposite to the acetabulum is not thinned nor expanded. A bone which 



may be the radius, or possibly the fibula, has marked peculiarities. The 



distal poi'tion has for a considerable distance on the inner side a median 



keel with a gutter on each side. The keel expands into the triangular 



articular facet. The rest of the shaft has an oval section. The external 



face of the head has two flat tuberosities, of which the external is much the 



larger, and has a concave posterior border. This bone is apparently too 



stout for the fibula and too slender for the radius. As one extremity is lost 



I cannot be positive as to its position. Its articular face fits the scaphoid 



and lunar bones. The inner face of the radius in Erinacevs is excavated, 



but has no keel. 



Measurements. M. 



Width of neck of ilium Oil 



Width of acetabulum 015 



Width of neck of ischium 015 



Width of (?) distal facet of (?) radius Oil 



Diameter of shaft of (?) radius near middle 006 



The teeth are like those of the specimen first described. The second 

 superior incisor has three sides of the crown ; a large extero-anterior convex, 

 a wider interior, and narrower posterior, plane. The true molars measure .026 

 on their bases, and the ramus is .023 deep at the anterior part of the last molar. 



Several fragments of jaws were found by Mr. Wortman, besides the 

 type specimen described, which are probably referable to it. All are from 

 the Big Horn bad-lands of Northern Wyoming. No specimens of the E. 

 acididens have been identified from that region, but several present the 

 measurements of the E. spatularius. 



14 



