512 



RICHARD SWANN LULL ON 



above measurements the first given is from the figured specimen, no. ||, the second from 

 the type, no. H, of the Hitchcock cabinet. 



This foi-m is very near E. (jiijanfeus being distinguished therefrom mainly hy its 

 more slender proportions. The other distinguishing feature mentioned by C. H. Hitch- 

 cock, namely, that of the greater divai'ication of the toes, is not always apparent as the 

 measurements show. The digits average .045 to .075 m. in width for rqyprorhnahts as 

 contrasted with .080 to .100 m. for gigantens. 



Type, no. f^, of the Hitchcock cabinet, on gray shale from Turner's Falls, Massa- 

 chusetts. It is also reported from Connecticut and New Jersey (fig. 32) . 



Eubrontes divaricatus (E. Hitchcock). 



Brontozoum divaricatmn E. Hitchcock, '65, p. 7, pi. 4, fig. 1. 



SjJeciJic characters. Divarication of digits II and III, 20°; of HI and IV, 35° to 50°. 



^ Length of digit II, .193 m.; of HI, .243 m.; 



/ \"' of IV, .262 m. Length of foot, .340 to .360 



m. Length of step, 1.040 to 1.190 m. 



U. divaricatus is best shown in the type 

 specimen, no. ^ (fig. 33), which contains a 

 row of four very deep tracks. It is distin- 

 guished, apart from size, by the decided 

 divarication of the outer toe, a readily recog- 

 nizable feature. In size it lies between E. 

 (/iganteus on the one hand and E. platt/j^ns 

 on the other. 



The type, no. -r, of the Hitchcock cabi- 

 net, is on hard shale, the locality being unre- 

 corded. 



Eubrontes platypus nom. nov. 



Amhlonyx gigantens E. Hitchcock, '58, 

 p. 71, pi. 13, fig. 1; pi. 38, fig. 1-2; pi. 57, 

 fig. 5. 



Fig. 33. Eubrontes divaricatus (E. Hitchcock). Impress 

 of the left pe.s. X j. Drawn from the type specimen, 

 no. ^A of the Hitchcock cabinet. 



Specific characters. Divarication of digits II and HI, 12°; of III and IV, 22°. 

 Length of digit II, .157 m.; of HI, .190 m.; of IV, .215 m. Distance between lateral 

 claws, .190 m. Length of foot, .267 m. Length of step, 1.135 m. Very long hmbed. 



