1888 .] 
125 
[Hitchcock. 
genus, and I will therefore mention only what is distinctive. Di- 
varication of the lateral toes, 65° ; of the inner and middle, 32° ; 
of the middle and outer, 32°. Length of step one foot ; of the 
stride, 2 feet, not including the heel. Trackway 6.25 inches wide. 
Length of hind foot 4.5 inches ; of the same including the heel, 8.5 
to 9 inches. 
Found at the Dickinson quarry, South Hadley. It may be the 
same with certain impressions at first called Brontozoum isodactylum 
by my father, but does not correspond to the reference by him of 
the most of that species to B. divaricatum in the Supplement. 
Type specimens, No. 142 and its relief 128 in the Mt. Holyoke 
Museum. Nos. 112 and 126 represent the same species from an- 
other localit}'. 
Anomcepus cuneatus. Divarication of the lateral toes 40°. Length 
of step 13 to 18 inches ; of the stride 37 inches. Width of the 
trackway scarcely more than that of the track, except where the 
animal seemed to have paused in his march, as in the type speci- 
men where the width is 7 inches. Long and distinct impressions 
made by the middle toe, and also by a slender tail. 
From Dickinson quarry, South Hadley. Type specimen, at Mt. 
Holyoke Museum and the relief slab of the same in Museum of 
Dartmouth College. The species is recognized upon slabs Nos. 
2 t 9 and in the Amherst Museum, which came from the Lily pond 
quarry and the Howland farm in Gill. The foot of the animal is 
very like that 6f the Grallator cuneatus. At first the two were 
thought to be identical ; but the shorter stride and length of step 
of the new form would seem to ally it with Anomsepus. 
Plectropterna elegans E. H. The large number of illustrations of 
this species from Wethersfield in the Mt. Holyoke Museum enables 
us to perfect the description of the hind foot, the front foot not yet 
being known. 
Hind foot. Tetradactylous, three toes directed forwards, the 
fourth being a spur at right angles to the heel. This genus differs 
from Ornithopus and Tridentipes in respect to the position of the 
spur, as it points backwards in the two latter. Heel narrow, taper- 
ing backwards and not wholly impressed. In this respect there is a 
departure from the normal character of the genus. Divarication 
of the front toes, 70° ; of the inner and middle, 30° ; of the middle 
and outer, 40°. Length of the spur or hind toe, .9 inch ; of the in- 
ner front toe, 1 to 1.75 inch ; of the outer front toe, 1.50 to 1.75 
