ART. 11 



SOME BUEGESS SHAKE FOSSILS — HUTCHINSON' 



15 



paper contain eight other specimens of Aysheaia from the same 

 horizon, which may be enumerated as follows : 



{a) Length 25 mm., dorso-ventrallj^ compressed, most of right 

 side missing; 11 appendages clear on right, posterior appendage of 



Figure 4.. — Aysheaia pedunculata Walcott. a, Anterior end 

 OF SPECIMEN a; m., mouth; al. c, alimentary canal; fr. p., 

 frontal papilla; ir. ap})., branched appendage (X 10). ft. 

 Fourth right leg of specimen a showing six claws and sub- 

 apical triangular area (X 50). c. Superimposed posterior 

 legs of specimen a; cl. r., claws of right leg; cl. I., claws 

 of left leg ; int. pr. r., internal process of right leg ; int. 

 pr. I., supposed internal process of left leg (X 50). d. 

 Branched appendage of specimen b ( X 25) 



left apparently lying close under its fellow, and visible on the right- 

 hand side. (Fig. 4, «-<?.) 



(h) Length 45 mm., laterally compressed, portions missing from 

 the mid posterior region. Eleven appendages on right, indications 



