538 ■ RICHARD SWANN LULL ON 



(Temis Shepardia E. Hitchcock. 



Shepar(Ji(( E. Hitchcock, '58, p. 131. 



Generic characters. Quadrupedal ; feet nearly equal in size. Manus pentadactylous. 

 Pes with a vestigial fifth digit ; apparently webbed. 



Shepardia palmipes E. Hitchcock. 

 Shepardia palmipes E. Hitchcock, '58, p. 131, pi. 24, fig. 2. 



Specific characters. Pes: divarication of digits I and H, 10°; of H and III, 13°; of 

 III and IV, 14° ; of I and IV, 37°. Length of digit I, .013 m.; of II, .025 m.; of III, .030 

 m.; of IV, .023 m. Distance between lateral tips, .022 m. Length of foot, .030 m. 



Manus : divarication of digits I and II, 30° ; of II and III, 25° ; of III and IV, 20° ; 

 of IV and V, 30°. Length of digit I, .010 m.; of II, .018 m.; of IH, .023 m.; of IV, .026 

 m.; of V, .010 m. Distance between lateral tips, .018 m. 



Type specimen in the Shepard collection at Amherst college, from Turner's Falls, 

 Massachusetts. 



Genus Comptichnus E. Hitchcock. (Elegant track.) 



Compticlmus E. Hitchcock, '65, p. 9. 



Generic characters. Quadrupedal, tetradactylous, digitigrade. Digits of the pes 

 broad, showing neither claw nor phalangeal impressions, those of the manus making pecu- 

 liar oval marks. 



Comptichnus obesus E. Hitchcock. 



Comptichnus obesus E. Hitchcock, '65, p. 9, pi. 5, fig. 4 ; pi. 1 8, fig. 6. 



Specific characters. Pes: divarication of digits I and II, 28°; of II and III, 20°; of 

 III and IV, 14°. Length of digit I, .0065 m.; of II, .009 m.; of III, .013 m.; of IV, .010 

 m. Length of foot, .015 ra. Length of step, .065 m. Width of trackway, .038 m. 



Manus : four oval impressions, three slightly radiating in front, one behind. Length 

 of the track, .008 m. 



Type specimen, no. Y, of the Hitchcock cabinet, from Turner's Falls, Massachusetts. 



Genus Arachnichnus E. Hitchcock. (Spider track.) 



Arachnichnus E. Hitchcock, '58, p. 117. 



Generic characters. Quadrupedal, plantigrade. Pes tetradactylous, as is also the 

 impression of the manus. Limbs moderately long ; body wide. 



