Rusi. 



914 



Rusichnites acadicus, Dawson, Acad. Geol. 1868, page 

 410, page 157, casts of continuous rounded furrows, about ^in. 

 broad, crossed by wayps and lines ; and on each side of each, 

 1-10 in. distant, parallel interrupted lines, casts in relief; ex- 

 actly like the tracks now made by the swimming feet and shell 

 edges of any small King crab (li?nulus)^ and curving to and 

 fro like these ; undoubtedly made by similar small crustaceans 

 of the Coal age. Dawson. See last -figure. XIIL — Note, 

 No instance of Rusichnites showing a definite termination is 

 reported; but Walcott has recently received for the Nat. Mus. 

 Wash. D. 0. a slab on which a track stops behind a fossil mol- 

 lusk as large as a man's hand. 



Rusophycus bilobatus (Fticoides lilobatus) Roge^rs, page 



822, fig. 626. Hall, 

 page 77, fig. 19, 1. 

 Vanuxem, page 79^ 

 fig. 11, 1. Clinton 

 formation, V a, 

 (Also in the Gin- 

 cinnati rocks, Lo- 

 raine, or Hudson 

 formation. Ill J. 

 S. A. Miller; Am. 

 Pal. Foss., 1877). 

 For varieties : cla- 

 vatus^ see Hall Pal. 

 N. Y.VoL2, Va;— 

 pudicus^ same. III 

 b ; V a. Subangu- 

 latus^ same, V a. — 

 grenvilliensis^ see Bil- 

 lings, Pal. Foss. Vol. 1, 

 1862. Chazy.IIh. 



