498 



IIICHARD SWANX LULL ON 



<n'ims Stenonyx noin. iiuv. (Narrow claw.) 

 LKptoiiijx E. Hitchcurk, '65. p. 8 (name preoccupied). 



///. 



Fi":. IT. Grallator yracl 

 lis K. Hitchcock. Impres- 

 sion of tlie left pes. X {. 

 From no. W of the Hitcli- 

 cock cabinet. 



(Tcntiir characters. Bipedal, tridactyl, fligitigrade track, very 

 minute. With thick toes and long slender claws and distinct phalan- 

 geal pads. Length of linil) unknown as the genus is known only 

 from two isolated tracks. There is no tail trace. 



Stenonyx lateralis (K. Hitchcock). 

 Leptonyx lateral h E. Hitchcock, '65, p. 8, pi. -j, fig. 3. 



Specific characters. Divarication of digits II and III, 32°; of 

 III and lY, 28°; of II and lY, 60°. Length of digit II, .015 m.; of 

 III, .021 m. ; of lY, .021 m. Distance between lateral tips, .021 m. 

 Length of foot, .030 m. 



This species seems to approach most nearly to Grallator gracilis 

 Init is much smaller, and has more slender claws which arise from the 

 median side of digits II and III and from the outside of digit lY ; hence the specific name. 

 Type, no. l^, of the Hitchcock cabinet, from Turner's Falls, Massachusetts. 



Genus Selenichnus E. Hitchcock. (Moon track.) 



Selenichnus E. Hitchcock, '58, p. 133. 



Generic characters. Bipedal, tridactylous. Inner toe rarely distinct. A continu- 

 ous caudal trace, but slightly sinuous. Tracks nearly in line and without pads or claws. 



Selenichnus falcatus E. Hitchcock. 

 Selenichnus falcatus E. Hitchcock, '58, p. 133, pi. 23, fig. 8 ; pi. 60, fig. 8. 



Specific characters. Pes : divarication of digits cannot be measured. Length of dio-- 

 its from extremity of the heel: of II, .036 m. ; of III, .072 m.; of lY, .056 m. Length 

 of foot, .072 m. Width of foot, .018 m. Length of step, .090 m. The feet turn outward 

 so that the heels are in line, the tail trace usually passing through them. The toes curve 

 inward. 



This IS a very striking track and tliough oljscure as to details is readily recognizable. 

 It was apparently formed by a sniall dinosain- of unknown affinities. 



Type specimens are nos. V and K;, of tlie Hitchcock cabinet, from Turner's Falls, 

 Massachusetts. 



