1873.] *-* [Cope. 



The dentition, is I. ; C. 1 ; P. M. 4 ; M. 2. The canine is a tusk of 

 compressed form with anterior and posterior cutting edges, and a strong 

 posterior curvature. Its fang is embraced one-third by the premaxillary 

 bone, and is enclosed in a rib-like swelling of the side of the cranium, 

 which extends upwards and backwards. The premolars are well worn, 

 and have transverse cordate surfaces of attrition. These have probably 

 resulted from the wearing down of a chevron of two crests converging 

 inwards, in some with an inner tubercle. On the molars this crescent is 

 represented by a V, with the apex inwards ; on the last, the inner tuber- 

 cle is at one side (the posterior) of the apex. 



Name. — I first applied the name Loxolophodon to this genus in a short 

 paper published August 19, 1872, as above cited, with a diagnostic de- 

 scription ; the L. covnutus was there cited as the first species, and is here 

 retained as the type. I again described it more fully in a paper published 

 August 22d, citing Eobasileus (August 20th) as a synonym, in which I 

 was in error, as indicated by the present paper. The same nomenclature 

 was employed in a paper read before the American Association for the 

 Advancement of Science, held at Dubuque, commencing August 23, 1872. 



In the paper of August 22d, I regarded this genus as identical with 

 that to which I had previously (February 10, 1872) applied the name 

 Loxolophodon, and included in it the species there called Bathmodon 

 {Loxolophodon) semicinctus, Cope. With further material this appears 

 not to be correct ; the Bathmodon semicinctus belongs truly to that 

 genus, and is very near to the B. radians, so that the name Loxolophodon 

 becomes a synonym in this connection, and may be used again for the 

 present genus without interference. 



Loxolophodon corntjtus. Cope. 



Loxolophodon covnutus, Cope. Proceedings American Philosophical 

 Society, 1872, p. 580 (August 19th), 1. c. 1872, p. 488 (August 22.1. 

 Eobasileus cormttus, Cope, American Xaturalist, 1872, p. 774. 



Established on the remains of a single individual, which consist of a 

 nearly perfect cranium, the right scapula complete, several vertebras 

 including the sacral, the first or second rib, the pelvis complete, and the 

 entire right femur ; also probably the proximal end of a radius. 



The species is remarkable for the narrow form of the cranium, its 

 width at the middle being one-fourth its length. A little in front of the 

 middle, are situated the horn-cores. These diverge, the upper portion 

 having an outward curvature. The base of each is triangular with 

 obtuse angles in section, and the inner angle is the section of a rib-like 

 projection which extends across the middle line to its fellow and rises 

 half way up the horn-core. Above its rather abrupt termination, the 

 core is transversely compressed, with oval obtuse apex. The core 

 measures M. .240 (9.5 inches) from its base in front, M. .108 (4.25 inches) in 

 width at the base behind, and .077 (3 inches) in diameter at the apex. A 

 slight swelling of the sides of the muzzle descends obliquely forwards 



