•"■•'is Lull — Fossil Footprints from the 



distinctness, while the smaller bears but three such pairs, 

 the latter from the right side of the body. These two 

 slabs appear to bear the impressions of two different 

 species of animals and will be described accordingly. 



The creatures which made the footprints were quadru- 

 peds of moderate size, with broad, stumpy feet, appar- 

 ently clawed, and having at least four toes in front and 

 five behind. The hind foot, which is somewhat the 

 larger, bore a proportionately greater share of the 

 creature's weight, especially in the smaller species. The 

 limbs were apparently short, with a wide trackway, 

 implying a bulky body. No trace of a dragging tail is 

 discernible on any of the specimens, and the body was 

 evidently carried clear of the ground. Several known 

 genera of Paleozoic footprints may be compared with the 

 present species, but none agrees with sufficient closeness 

 to warrant the inclusion of these forms. They therefore 

 seem to pertain to a new genus which will be called 

 Laoporus, and the affinities of which, from the criteria 

 which they present, seem to lie with the genus Limnopus 

 Marsh from the Kansas Coal Measures. 1 



Laoporus, n. gen. 



(Xa?, stone -f- 7ropo?, track) 

 Generic characters. — Quadrupedal, without tail trace, 

 with four digits in the manus and five in the pes, semi- 

 plantigrade, broad-soled, with short digits which in the 

 impressions lack phalangeal pads. Traces of claws 

 appear to be present but they could have had no grasping 

 or predatory function. Feet turned inward toward the 

 line of march. 



Laoporus schucherti, n. sp. 

 (Plate I; text fig. 1.) 



This species I take as the type of the genus, the type 

 specimen being the larger slab collected, by Professor 

 Schuchert, catalogue number 2143, Yale Museum. 



Specific characters. — Small, the greater portion of the 

 weight being borne upon the pes. Digits pointed, those 

 of the pes showing in at least one impression distinct 



1 O. C. Marsh, Footprints of vertebrates in the Coal Measures of Kansas, 

 this Journal, (3), 48, pp. 81-84, 1894. 



