The ventral scutellation is present in a small patch (plate 16, fig. 1) near the horn of the skull. The scutæ are oat-shaped and take the usual form. The ribs are not long, are rather stout, and beyond the proximal curve are nearly straight to the obtuse tips. The heads of the ribs are so obscure that it is impossible to determine whether they were two-headed or not. They are expanded proximally and there is a slight tendency to a division of the head. Portions of both fore limbs are preserved. The right limb possesses the humerus, separate radius and ulna, and 2 metacarpals. The other possesses only the radius, 3 metacarpals, and a portion of a phalanx. The humerus is a very stout bone and at once recalls that of _Amblyrhynchus_. The ends are expanded and there are roughnesses on the bone for the attachment of muscles. The radius and ulna are subequal in size. They are both expanded more proximally than distally. The carpus was cartilaginous. An additional specimen of this species is figured on plate 16, fig. 5. This adds to our knowledge of the pelvis especially. Measurements of the Type. mm. Length of entire specimen 80 Length of tabulate horn of skull 20 Width at base 4 Width at tip 2.5 Length of right humerus 16 Width at middle of shaft 3 Width at proximal end 5 Width at distal end 5.5 Length of radius 9 Length of ulna 9 Width of radius at proximal end 2.5 Width at middle 1.5 Width at distal end 2 Width of various portions of ulna same as radius. Length of the only phalanx preserved 5 Length of vertebra 5 Width of vertebra 4 Length of longest rib 17 Width of rib at widest part 1.5 Width of clavicle 18 Length of clavicle 20 Length of interclavicle 25 Width of interclavicle 16 Length of single side of chevron scute 7 Width of same .25 The specimen (No. 2566, Am. Mus. Nat. Hist.) on which Cope based his _Tuditanus mordax_ is composed of two plates of the above-described species. =Diceratosaurus lævis Moodie.= Moodie, Jour. Geol., XVII, No. 1, p. 63, figs. 13, 14, 1909. Type: Specimen No. 102 (8680 G), American Museum of Natural History, where it forms part of the Newberry collection. Horizon and locality: Linton, Ohio, Coal Measures.