190 MESOZOIC FLORAS OF UNITED STATES. 



of the conihiiuition 2.49 kg. This specimen appears to have l)een nearly 

 spherical, and somewhat resembles the trunk Xos. oUO. 1 9 and 500.53. Like 

 that, the interior is very hard and smooth and the surface is covered 

 witli a thick ramentum. Some of the fractures show the exogenous 

 structure quite clearly. 



Xo. 100.220 is another good specimen, representing somewhat more 

 tlian half of a small trunk and weighing 0.75 kg. The base and one of 

 the sides are well shown and exogenous structure is clearly seen in the 

 irregularly longitudinal fracture. 



Xos. 500.293 and 500.388 are two small complementary parts of 

 the armor with regularly curA-ed iimer and outer surfaces, having exactly 

 the same thickness and texture of the armor as Xo. 500.61, as shown 

 in the transverse section, pi. cxxxii, fig. 2, of the first paper. They 

 undoubtedly belong to that trunk and come from a point very near 

 that fractured plane, but they do not exactly join it, and are probably 

 from a somewhat different plane. They can belong nowhere else, as 

 the opposite hemisphere is present in the specimen Xo. 500.53. These 

 fragments are of unequal size and together weigh only 0.13 kg. 



There are two other specimens that complement each other, viz, 

 Xos. 500.416 and 100.253. They are small fragments and weigh together 

 0.61 kg. They show the ring of woody wedges more distinctly than 

 any other specimen except X^o. 500.19, l^ut they do not otherwise resem- 

 ble that trunk and can not be referred to any of the triniks of this species 

 thus far found. There is, however, no doubt that they represent this 

 species. They may possibly belong to the same trunk as the fragment 

 X*o. 500.174, which also shows the structure and the rings with unusual 

 clearness. That specimen is a small segment from the base of a trunk 

 weighing 0.44 kg. It extends to the medulla, and the fractures show 

 three distinct rings of wood. Xone of the remaining specimens are 

 specially worthy of comment. 



PI. LIV, Fig. 1, shows the tangential fracture of the first of these 

 adjacent to the corresponding face of the second. PI. LIV, Fig. 2, 

 shows the internal structure of No. 500.416, and Fig. 3 that of No. 500.174. 



