State Museum of Natural History. 



33 



but they are all of the same breadth, and they may all have been 

 impressed by one and the same animal. The breadth of the trails is 

 about six inches and three-quarters to the outer side of them." 



" The transverse ridges and furrows are sometimes straight (Fig. 2), 

 and sometimes curved (Figs. 3-4-5). When straight and regular they 

 measure about an inch and three-quarters from the middle of one 

 furrow to that of the next. The height of the ridge is usually from 

 one and a half to two lines, and from the highest part the distance 

 to the middle of the furrows is about an inch and a quarter on one 

 side and half an inch on the other, thus giving to the ridge a sharper 

 slope on the shorter side. The tops of the ridges and the bottoms 

 of the furrows are somewhat rounded. 



"Though the transverse ridges are occasionally straight (Fig. 2) 

 they are in general either slightly or considerably curved (Figs. 3-4-5) 

 and when so, the chord of the curve is seldom quite at right angles to 

 the direction of the parallel side ridges, one end of the chord in the 

 greatest obliquity observed, being as much as two inches and a half 

 in advance of the other (Fig, 3). 



"The height of the curve above the chord is sometimes as much as 

 an inch and three-quarters. It is often somewhat pointed, and the 

 highest part is not always in the middle between the parallel side 

 ridges (Fig. 4). The concave side of the curve is always on the 

 steeper side of the transverse ridges. 



" There runs along the track a ridge intermediate between the two 

 parallel side ridges (Fig. 3-4-5), and though it is not so conspicuous 

 as these, it is seldom altogether wanting, but appears to be most 

 obscure when the transverse ridges, or rounds of the ladder, are 

 straight. This intermediate ridge does not keep parallel with the 

 side ridges, but occasionally runs in sinuous sweeps from within an 

 inch and a half of one side (Fig. 5) to the same distance from the 

 other; sometimes however, it runs nearly parallel with the sides for a 

 considerable distance, either in the middle or somewhat on either side 

 of it. In one of the tracks in the course of the intermediate ridge a 

 sudden dislocation of an inch and a quarter (Fig. 3 towards the top) 

 on the opposite sides of one of the transverse ridges. The course of 

 the intermediate ridge appears in general to coincide with the suc- 

 cessive most salient parts of the transverse ridges when these are 

 curved, but this is not always the case (Fig. 4). The intermediate 

 ridge appears most conspicuous where it crosses the tranverse fur- 

 rows, yet its crest or line of summit seems to undulate with the 

 ridges and furrows, though not to so great a degree. 

 5 



