588 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



^ Jleasnrements. 



M. 



Lentrth between scapular arch and posterior border of femora , 0.165 



Depth at front of dorsal fin 0. 074 



Width of epiclavicle 0.013 



Width of femoral bones behind 0. 036 



Length of bases of eight dorsal radii 0. 023 



The interior of this fossil is exposed by the disorganizatioQ of one of 

 the sides. It is filled with a chalcedony, whose minutely botryoidal 

 semi-transparent surface is an elegant imitation of ova. 



I add here, that having had an opportunity, through the kindness of 

 Dr. Isaac Lea, of examining the typic il specimen of Saurodon leanus 

 Hays, I find that my Daptinus plilebotomus belongs to the same genus, 

 and its name must therefore be v\ ritten Saurodon plilebotomus. The teeth 

 in the New Jersey species are not so cylindric as published figures indi- 

 cate, and the internal foramina of the dentary are not isolated as in 

 Sauroeeplicdus. 



I also add, that a consider.itiou of the skeleton of the genus Ghiro- 

 centriis shows that it is the nearest living ally of the Saurodontidw in 

 the structure of the palatal and oral boues, the posterior skull, pectaral 

 spine, and vertebrae. The femora are materially different, 



4. — FOSSILS FROM THE JUDITH RIVER BEDS. 



1. Cranial bones of a Dlnosanrian. — A. number of the boues of the 

 skull of a large Dinosauriau Reptile were found in the second bed of 

 lignite above the lower bed of sandstone represented in Fig. 3 as be- 

 longing to the Judith River beds, or Cretaceous No. 6. The locality 

 where they are found is on the north side of the Missouri River, nearly 

 opposite to the mouth of Dog Creek. The bones were lying n immedi- 

 ate contact, and with them was found a fragment consisting of two and 

 part of a third teeth. These present the characters of the genus Dlclo- 

 niiis, and of either the species D. calamarius or D. perangulatus, or one 

 not described. 



These bones exhibit anomalous characters, and, with one exception, 

 their identification presents a difficult problem. They were numbered 

 in the order of their discovery from 1 to 12, but I commence the de- 

 scription with No. 8, as the one which furnishes the basis for the determi- 

 nation of the others. This portion of the skull includes the united oc- 

 cipital and sphenoid regions, with some lateral elements in close contact 

 with them. The sutures separating the basioccipital and basisphenoid, 

 the exoccipital and prootic, and the prootic and basisphenoid are dis- 

 tinct and squamosal in character. Other sutures are not visible. The 

 bones are generally thin, especially their superficial dense layer. 



A remarkable peculiarity of the basal axis of the cranium is its ob- 

 liquely ascending direction, as its plane makes with that of the poste- 

 rior occipital surface an angle of forty degrees. The latter 'plane was 

 also directed forward, as indicated by the position of the occipital con- 



