340 



Lull — Fossil Footprints from the 



that collected by Doctor Noble (U. S. National Museum 

 catalogue number 8422), for whom the species is named. 

 Specific characters. — Somewhat larger than Laoporus 

 schucherti, the manus making in each instance a clearer 

 impression, including the palm; the claws, however, are 

 less distinctly marked, although in the Noble specimen, 

 in which the creature dragged the feet of the left side, 



Pig. 1. 



Fig. 1. Laoporus schucherti, n. sp. a, left manus; b, pes. Natural size. 

 Fig. 2. Laoporus noblei, n. sp. a, right manus; b, pes. Natural size. 



the footprints being in relief, the long narrow scratches 

 made by the claws are distinctly visible (see Plate II, fig. 

 2). Manus and pes imprints further apart in the Noble 

 specimen, due probably to difference in gait, or because 

 the creature was partly water borne. Digits of the pes 

 seeming relatively shorter and blunter than in Laoporus 

 schucherti. 



Dimensions. 



Manus. 



Schuchert slab Noble slab 

 mm. mm. 



Length 20 21-2 



Width 21 24 



Length of digit i 7-4 



" " ii 12-5 



" " iii 8-0 



" " iv 6-5 2 



2 Apparently longer from claw scratch. 



