PLATE X. 



Page 

 ARCH.EOCRINUS LACUNOSUS (Billings) 255 



Fig. 1. Posterior view of the type specimen. (Museum Geol. Surv., Canada.) 



ARCHiEOCKiNUS MicROBASALis (Billings) 256 



2a. Specimen with arras and stem. (Coll. John Stewart.) 

 2b. Another specimen. (Same collection.) 

 2c. Basal aspect. (Same collection.) 



Arch^oceinus pyrifoemis (Billings) 255 



3a. The type specimen. (Museum Geol. Surv., Canada.) 



3b. A crushed specimen, showing the arms. (Same collection.) 



Arch^oceinus desideeatus W. R. Billings 257 



4a. The type specimen with arms ; the left posterior radius in front. (Coll. 



W. R. Billings.) 

 Ab. Dorsal aspect of the calyx. (Coll. W. and Sp.) 



DiABOLOCEiNus HiEROGLYPHicus W. and Sp 252 



5a. Dorsal aspect of a large specimen. (Coll. W. and Sp.) 

 5b. Side view of the same. 



5c. Anal side of a small specimen. (Same collection.) 

 (Figs. 2c and 5a are drawn with anal side up.) 



