FOSSIL P^WTPRINTS OF THE JURA-TRIAS. 



488 



of II. .038 m.; of III. 

 the tips of the hiteral 



Batrachopus deweyanus E. Hitchoock. 



Batriichojm.s fJ(^irei/ionis E. Hitchcock. '45b. p. --J- 



Anisopus deweynnus E. Hitchcock, '48, p. --0 ; '58, p- fiO. pi. 9, fig. o ; pi. 41, fig. 2 ; 

 pi. 4?., fig. 1-2 ; pi. o3. fig. 8 ; pi. 58, fig. 11. 



Specific characters. Pes: divarication of digits 1 and 11. 12° ; of II and III, 23° ; of 

 HI and IV, 6° ; of I and IV. 40°. Length of digit I. .025 m. ; 

 .043 m. ; of IV. .038 m. ; of the foot. .043 ni. Distance between 

 toes, .028 m. 



Manns: divarication of digits I and 11, 53° ; of 11 ami 111, 13°; of HI and IV, 18°; of 

 IV and V, 24° ; of I and V, 107°. Length of (Ugit I, .008 m. ; of II, .020 m. ; of III, .025 

 m.; of IV, .025 m.; of V, .01 '^ ni. Distance between lateral tips. .01'.) ni. Length of 

 step, .100 to .113 m. Width of trackway, .050 to .075 m. 



This is a somewhat variable species, bnt in at least one specimen, no. ^f, of tlie 

 Hitchcock cabinet, the variation is so great that it has been deemed wise to erect a new 

 species for its reception. 



Type specimens: uos. ~ and ^ , of the Hitchcock cabinet on hard gray shale. Type 

 locality not recf)rded, but the species is reported from Middletown, Connecticut. 



Batrachopus dispar sp. nov. 



Specific characters. Pes: divarication of digits I and II, 18°; of II and HI, 20°; 

 of HI and IV, 22°; of I and IV, 60°. Length of digit I, from the middle point of the 

 heel. .046 m. ; of II, .067 m. ; of HI, .072 m. ; of IV, .062 m. Dis- 

 tance between lateral tips, .053 m. Length of foot, .073 m. The 

 digits all bear slender claws except the fourth which is clawless. 

 The toes are broad and the heel is of considerable width as the bulk 

 of the weight was borne upon it. Length of step, .230 m. 



Mauus : but foui- digits impressing. Divarication of digits I 

 and II, 26°; of II and III, 68°; of III and IV, 20°; of I and IV, 

 122°. Length of foot, .030 m. Distance between tips of the lateral 

 toes, .028 m. The manus of this form is about equal in size to that 

 of B. deweyanus, while the pes is twice as large. The name dispar 

 is given on account of the great disparity in size of the fore and iiind 

 feet (fig. 2). 



The type is no. ~, of the Hitchcock cabinet, on red shale 

 from the Lily pond at Turner's Falls, Massachusetts. 



yiv.. 2. JJatraclwpiat dis- 

 par Lull. Impressions of 

 the left manus and pes. 

 X i- ]Jrawn from the 

 type specimen, no. -j'l '" 

 the Hitchcock cabinet. 



