130 Annals of the Carnegie Museum. 



Among other remains of Laramie dinosaurs, collected in Wyoming 

 during the past season, there is a large slab of sandstone, containing a 

 considerable portion of the pelvis and sacrum and some twenty of the 

 anterior caudals, as well as numerous ossified dorsal tendons, so abun- 





Fig. I. 

 Dermal impression from forelimb of Claosaurus (Thespesius) annectens Marsh. 

 (Nat. size). (Specimen in U. S. National jSIuseura. ) 



dant in Claosaurus. This specimen (No. io6) derives its chief interest, 

 however, from the fact that there are preserved in the region extend- 

 ing from the fifteenth to the twentieth caudals an impression of the 

 dermis, which shows these animals to have been covered in life with 

 small bony, or chitinous scutes. In my original notice of these dermal 

 scutes I referred to them as small hexagonal plates. A closer examina- 

 tion, however, shows that they are not all of the same size or geomet- 

 rical form. Our material shows that there was in some instances a 

 central heptagonal plate some 9 mm. in greatest diameter,^ surrounded 

 by seven somewhat smaller hexagonal plates. These, or similar rosettes, 

 appear to have been arranged in bands extending from the top of 

 the dorsal region of the tail down the sides in parallel lines, each band 

 separated from the succeeding and preceding series by narrow trans- 

 verse ridges, the interstices between the hexagonal plates and transverse 



' In my notice in Science I spoke of thes plates as somewhat more than half an 

 inch in diameter, while by actual measurement they are somewhat less than half an 

 inch. 



