98 ROYAL SOCIETY OF CANADA 



NANOPUS Marsh. 

 Nanopus obtus us n. sp. PI. y., figs. la-d. 



Stride and straddle unknown. 



Fore foot placed outside, and somewhat distantly behind the hind 

 foot in one example. 



Hind foot. Length, 20 mm. ; width, 22 mm. There are four toes, 

 the first digit being absent. The fifth sets off from the others; the 

 fourth digit is longest, and is directed forward; the other two are 

 progressively shorter and are directed inward. The first digit appears 

 to be indicated by a round lobe behind the fourth. Sole, 10 mm. long 

 and 16 mm. wide, and it is somewhat quadrate behind. The extremities 

 of the toes are obtuse and show no trace of claws. Angle of incidence 

 of the digits, II.-V.=80° to 90°; IV.-V.=40° to 4:5". 



Fore foot. Length, 2ô (?) mm.; width 12 (?) mm. (This foot- 

 mark is probably distorted and has gained in length at the expense of 

 the width). Three toes are preserved of which the outer is longest; 

 the others are progressively shorter inward. The points of the toes are 

 obtuse, and there is no trace of claws. The sole is subquadrate (?), 

 and a strong ridge, perhaps accidental, runs from the inner corner 

 of the heel to the base of the outer toe; behind this a flattened area 

 (which appears to be a part of the sole), bears a faint lobe or swelling. 



This species differs from Nanopus caudatus. Marsh, in the form 

 of the fore foot, and in other respects. 



Nanopus quadeatus n. sp. PI. Y., figs. 2a and I. 



Stride, 42 to 47 mm. Straddle, 30 nun. 



Fore foot print behind the hind foot and a little outside of it. 



Hind foot. Length, 12 to 13 nun. ; width, 13 to 14 mm. There are 

 four toes. The fifth digit is short and somewhat separated from the 

 others ; fourth digit somewhat longer than the others ; it and the two next 

 inward digits are nearly equally radiate; there is perhaps a trace of 

 the fifth digit in a swelling of the heel. Sole, 6 mm. long and of the 

 same width; it is quadrate in form and has an impressed lobe at each 

 angle. There are claws to all the toes. Angle of the digits, II.-V.= 

 110°; W.-Y.=60°; II.-III; and III.-IV. each 25°. 



Fore foot. Length, 13 mm.; width, 11 mm. Three toes are dis- 

 tinctly shown. The fifth digit is very short and faint; the fourth is 

 long and sets off from the other two; the third digit projects farthest 

 forward the second is shorter and turns inward. There are claws to 



