142 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



DESCRIPTION OF PLATE 22 



PAGE 



Kainella billingsi (Walcott) 102 



Fig. I. (Natural size.) Large cranidium, the outlines of which have 

 been restored, illustrating the main characters of the spe- 

 cies and genus. U. S. Nat. Mus., Cat. No. 70334. 



2. (Natural size.) Side view fig. i. 



3. (Natural size.) Associated free cheek, supposed to belong to 



this species. Border broken away all around, exposing 

 the doublure. General direction of facial suture indicated. 

 U. S. Nat. Mus., Cat. No. 70335- _ 



4. 5. (Natural size.) Dorsal and posterior views of an associated 



pygidium referred to this species. Outline restored. U. S. 

 Nat. Mus., Cat. No. 70336. 



6. (Natural size.) Associated thoracic segment from near the 



posterior end of the thorax. U. S. Nat. Mus., Cat. No. 70337. 



7. (Natural size.) Associated segment from the anterior end of 



the thorax. U. S. Nat. Mus., Cat. No. 70338. 



Matrix, limestone. 



Ozarkian, Chushina formation. (Loc. 6iq) : Robson Peak Dis- 

 trict, British Columbia. 



Moxomia angulata (Hall and Whitfield) 107 



Figs. 8, 9. (Natural size.) Dorsal and side views of the cranidium, 

 the only portion of this trilobite known. U. S. Nat. Mus., 

 Cat. No. 70339. 



Matrix, limestone. 



Ozarkian, Chushina formation. (Loc. 6iq) : Robson Peak Dis- 

 trict, British Columbia. 



Housia canadensis Walcott (see pi. 7, figs. 4, 8) 94 



Figs. 10, ii. (Natural size.) Shaly limestone with various parts of 

 this species. These are better preserved than the previously 

 illustrated specimen. U. S. Nat. Mus., Cat. No. 70340. 



Matrix, siliceous shale. 



Upper Cambrian, Goodsir formation. Mount Goodsir, British 

 Columbia. 



