4IO SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



OlcneUns fremonti, new species (continued) : page 



19. Broad form of cephalon with the same characters as that shown 



by fig. 17. Natural size. Locality (52), Eureka District, 

 Nevada. U. S. National Museum, Catalogue No. 568190. 



Figures 17, 18, and 19 are copied from Walcott, 1884, pi. 21, 

 figs. 7, 9, and 8, respectively, where the forms are labeled 

 Olcnellus hozvelli. 



20. Outline of a small weathered specimen of a minute cephalon 



that is doubtfully referred to this species from locality (3i3g), 

 Groom District, south end of Timpahute Range, between Nye 

 and Lincoln Counties, Nevada. U. S. National Museum, 

 Catalogue No. 56823a. 



Figure 20 is copied from Walcott, 1886, pi. 19, lig. 2e, where 

 it is labeled Olenellus gilberti. 



21. Hypostoma (X3) associated with the cephalons represented by 



figs. 10-19 at locality (52), Eureka District, Nevada. LI. S. 

 National Museum, Catalogue No. 56819/'. 



22. Hypostoma associated with specimens of the cephalon of this 



species at locality (176), Deep Spring Valley, California. 

 Natural size. U. S. National Museum, Catalogue No. 56820&. 



DESCRIPTION OF PLATE 38 



Olcnellus canadensis, new species 316 



Fig. I. A large cephalon, partially restored in outline. The intergenal 

 angle is not usually present in this species. Natural size. 

 Locality (35/O, Mt. Bosworth. British Columbia. LT. S. Na- 

 tional Museum, Catalogue No. 56814a. 

 2 and 3. Illustrations of the hypostoma found associated with the 

 cephalon. Natural size. 2 = locality (35/2), Mt. Bosworth; 

 3 = locality (35f), Mt. Stephen; both in British Columbia. 2a 

 shows the convexity of the hypostoma. U. S. National Museum, 

 Catalogue Nos. 56815a and 56814&, respectively. 



4. Fragment of a cephalon, showing the genal angle extending 



into a spine. Natural size. Locality (35/^), Mt. Bosworth, 

 British Columbia. U. S. National Museum, Catalogue No. 

 568i4r. 



5. Fragment of a cephalon, showing the eye lobe and tubercle 



back of it. Natural size. Locality (35/1). Mt. Bosworth, 

 British Columbia. U. S. National Museum, Catalogue No. 

 568 I 4 J. 



6 and 6a. A small cephalon in which the marginal border is nar- 

 row. X 3- Locality (35/; ), Mt. Bosworth, British Columbia. 

 U. S. National Museum, Catalogue No. 568i4<?. 



7. Fragments of a side of a cephalon with genal spine preserved. 

 Natural size. Locality (35/), Mt. Stephen, British Columbia. 

 U. S. National Museum, Catalogue No. 568156. 



