542 RICHARD SWAXX LULL ON 



This genus witli its single species, T. inaeqiidlis, is known from bnt two specimens 

 which are somewhat dissiniihir and whose true characters cannot be leai-ned. Hence it is 

 very doubtful whether this should be considered a valid genus. 



Toxichnus inaequalis K. Hitoluock. 

 To.i-ir/i/iii.^ iiinequaUs E. Hitchcock, '65, p. I-. 1)1- •'». Hg. 5. 



Oenus Trihamus K. Hitchcock. (Three hooks.) 



Tnhaiiuix E. Hitchcock, '65, p. ■•. 



(reneric characters. Bipedal, tridactyl, digitigrade ; heel large, toes slender, inwardly 

 curving like hooks. 



This genus was founded upon a single specimen of two successive tracks. 



Trihamus elegans E. Hitchcock. 

 Trihamus ehxjans E. Hitchcock, '65, p. •', pi. -2, <ig. o. 



Specific characters. Pes : divarication of digits H and IV, 70° to 80°. Length of 

 digit II, .015 m.; of III, .019 m.; of IV, .02o m. Length of heel, .008 m.; of the foot, 

 .030 m. Distance between latei-al tips, .020 to .023 m. Length of step, .140 m. 



This form is long of limb and seems to have had proportions which suggest a small 

 Grallator, but the foot characters so far as can be learned are quite different. 



The type is no. ^, of the Hitchcock cabinet, from Turner's Falls, Massachusetts. 



Trihamus magnus ('. H. Hitchcock. 



Trihamus uiar/uus (,'. H. Hitchcock, '89b, pp. 118, 126. 



Hitchcock describes this form as being very like T. elegans, save in size. Length of 

 step, .150 m. 



Type, in Mt. Holyoke museum. 



(Teiius Typopus E. Hitchcock. (Type, Syriae, foot.) 



Typopus E. Hitchcock, '45b, p. 25. 



This genus seems to be founded upon abnormal feet, distorted beyond recognition, 

 and while two specimens exist of each species the tracks were found in each case well 

 within one animal's range. 



