Manchester Memoirs, Vol. Hit. {igog). No. ^"Z. 7 



Buckland {Plate III., Figs. 20, 206). The cast only shows 

 four digits distinctly in the best print of the pes {Fig. 20), 

 but it seems evident that the first digit was really present. 

 Both Duncan and Buckland describe it as really having 

 five digits. The third and fourth digits are nearly equal 

 in length ; the fifth is short and turns outwards. The 

 impressions of the pes immediately precede those of the 

 manus, sometimes nearly obliterating the latter {Fig. 20b). 

 The pes and manus appear practically identical. There 

 are large mounds of sand behind each impression. 

 Specimens are in the Edinburgh Museum. This print will 

 be termed CI. i. 



ChelicJiniis aitibiguus, Jard, (Jard., '53, plates VI. 

 and XI) is drawn in Figs. 21 and 21b, taken from Jardine's 

 plate VI. This form differs from Cl. i in its more slender 

 digits, and in showing distinct evidence of a web between 

 them. The prints are smaller and the track less wide. 

 All the prints in this track are less deeply impressed, but 

 this is much more marked in the anterior than in the pos- 

 terior impressions. I believe the anterior represent the 

 manus, but this is not quite clear. The fifth digit is no- 

 where shown. There is an example in the Edinburgh 

 Museum. This form will be described as Cl. 2. 



Batrichnus lyelli, Harkness sp., is shown in Fig. 22, 

 from Jardine's plate XIII. It was described by Harkness 

 (Hark., '51, p. 94) as a " Labyrinthodon " {i.e. a cheirothei- 

 roid print), under the name labyrinthodon Lyelli. The 

 only reason, apparently, for this curious reference is the 

 small manus. The track is of the usual chelichnoid type, 

 as are the prints themselves. The prints figured by 

 Jardine are not very clear, and Fig. 22 has been drawn by 

 a careful comparison of several. 1 have no doubt as to 

 its correctness. There are distinct marks of a web in 



