172 AN ATTEMPT TO DESCRIBE THE ANIMALS THAT MADE 



Remarks. — This species varies considerably in size, and its 

 tracks are quite abundant at Turner's Falls and Northampton, and 

 are found also at Wethersfield, Portland, and Middletown. It has 

 also been found at Pompton, in New Jersey, by W. C. Redfield, 

 Esq. (Am. Jour. Sci., Vol. XLIV. p. 134, and XLV. p. 315), and 

 is the only species of this genus found out of the valley of Con- 

 necticut River. It is respectfully dedicated to Dr. Benjamin Silli- 

 man, of New Haven. 



On Plate 24, fig. 5, is an outline of an interesting slab, less 

 than two feet in diameter, discovered by Mr. Plinius Moody, in the 

 north part of South Hadley, and deposited by him in Amherst Col- 

 lege. It contains 20 tracks of this species on that small surface, 

 in relief, many of them very distinct, brought to light by the action 

 of water ; the track being so much concreted as not to be washed 

 away nor disintegrated. The tracks are not all on one layer. 



Species 3. Brontozoum loxonyx. (PI. II. Fig. 1, 2.) 



Orniihichnites tuberosus in part, Am. Jour. Sci., Vol. XXIX. 

 p. 318. 



Ornithoidichnites tuberosus in part, Mass. Geol. Report, Plate 

 37, fig. 20. 



Nos. 44-46, 53, 54, 187-190, in Cabinet. 



Divarication of the lateral toes, 25° to 30° ; of the inner and 

 middle toes, 15° to 20° ; of the middle and outer toes, 10°. 

 Length of the middle toe, 6 inches ; of the inner toe, 4.4 inches ; 

 of the outer toe, 5.5 inches ; of the foot, 8 inches ; of the claw, 

 1 inch ; of the step, 30 inches. Distance between the tips of 

 the lateral toes, 5.75 inches ; between the tips of the inner and 

 middle toes, 4 inches ; between the tips of the middle and outer 

 toes, 4 inches. Projection of the middle toe beyond the lateral 



