Hitchcock.] 
126 
[Dec. 19, 
inch ; of the middle toe 2 to 3 inches ; of the heel, 1.75 to 2 inches ; 
of the middle toe beyond the rest 1.75 to 1.90 inch ; of the foot 5 
to 5.2 inches; of the step 18 to 21 inches. Toes slightly curved 
inwards. From tip to tip of the lateral toes 2 to 2.35 inches ; from 
tip of inner to tip of middle toe, 1.88 to 1.95 inches ; from tip of outer 
to tip of middle toe, 2.1 to 2.6 inches ; from tip of middle to end of 
spur, 3.75 to 4.8 inches. Width of trackway about three inches. 
Animal walks nearly in a right line. Locality, Wethersfield Cove. 
Descriptions based upon Nos. 53, 91, and 242 of the Mt. Holyoke 
Museum. Represented upon eighteen other slabs. 
Brontozoum divaricatum . The Wethersfield specimens lead to a 
better knowledge of the species and the most important features 
are the following. The fractional numbers refer to the slabs in the 
Hitchcock Ichnological Museum at Amherst. 
Type specimen No. -¥• 
In the cabinet Nos. h f, two steps, if, ■¥» ¥, If, ¥> ¥> 
fi, If, ¥, ib 
Divarication of the lateral toes, 70° to 72° ; of the inner and mid- 
dle, 25° to 28° ; of the middle and outer 45°. Length of the inner 
toe 7 inches ; of the middle toe, 9 inches ; of the outer toe, 7.75 
inches ; of the foot 14 inches ; of the step 3 feet 6 inches ; of the 
stride 6 feet 6 inches. Width of toes 2.5 inches ; of posterior part 
of foot 6 inches ; of the claw one inch. Distance between the tips 
of the lateral toes 9.75 inches ; between the outer and middle, 7.5 
inches ; between the inner and middle, 6 inches. Width of the 
trackway 18 inches. The toes are turned out slightly and deeply 
impressed in walking. 
The smaller variety mentioned in the supplement, page 7, is rep- 
presented upon Nos. fi-5 37-5 A o a - The length of step may be 
stated to be 3 feet 3 inches, and of the foot 8 inches. 
OTHER NEW SPECIES. 
Concerning other new species I would remark briefly. Plesiornis 
giganteus is a quadruped with trifid feet comparable with Bronto- 
zoum minusculum in size, and related to a large Iguanodon from 
England, whose tracks are exhibited in the Museum of the Geo- 
logical Society of London. The hind and front feet are nearly 
alike. 
Trihamus magnus is very like T. elegans save in size. Its length 
of step is about 6 inches. 
