408 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



DESCRIPTION OF PLATE 37 



PAGE 



Olcncllus fremonti, new species (See pi. 41) 320 



Figs, i and la. Top view and side outline of a fragmentary cephalon. 

 Natural size. Locality (14/), 15 miles east of Resting Springs, 

 California. U. S. National Museum, Catalogue No. 568x80. 



2. Cephalon from locality (52), Prospect Mountain, Eureka District, 

 Nevada. Natural size. U. S. National Museum, Catalogue No. 

 56819a. 



3 and T,a. Top view and side outline of a strongly convex cephalon. 

 Natural size. Locality (176), Deep Spring Valley, Nevada. U. 

 S. National Museum, Catalogue No. 568200. 



4. Cast of interior surface of the test of a broad cheek showing 



the strongly reticulated surface. X 2. Locality (14/'), west 

 of Resting Springs, California. U. S. National Museum, Cata- 

 logue No. 568210. 



5. Enlargement of the outer surface of the broad cheek, the 



border, and genal spine. X 2. Same locality as fig. 4. U. S. 

 National Museum, Catalogue No. 56821&. 



6 and 6a. Examples of the enlarged pleurae of the third thoracic 

 segment. Natural size. From locality (52), the Eureka Dis- 

 trict, Nevada. U. S. National Museum, Catalogue Nos. 56819^ 

 and 56819c, respectively. 



Figure 6 is copied from Walcott, 1886, pi. 19, fig. 21 ; where 

 it was labeled Olenellus howelli; and fig. 6a is copied from 

 Walcott, 1884, pi. 9, fig. 15c, where the specimen is labeled 

 Olenellus gilberti. 



7. Longitudinally compressed form of a nearly entire specimen of 



the dorsal shield from locality (30), western side of the High- 

 land Range, Lincoln County, Nevada. Natural size. U. S. 

 National Museum, Catalogue No. 568220. 



Figure 7 is copied from Walcott, 1886, pi. 21, figs. 2 and 2a, a 

 slight change being made in the cephalon, the eyes being much 

 too long in the original figure. The form was assigned [1886 

 and 18910] to Olenellus gilberti. 



8. A small cephalon with short eyes and an ocular ridge. Genal 



angles advanced about one-half the length of the cephalon. 

 X 6. Locality (52), Prospect Peak, Eureka District, Nevada. 

 U. S. National Museum, Catalogue No. 56819^. 



Figure 8 is copied from Walcott, 18S4. pi. 9, fig. 15/;, where 

 it is labeled Olenellus hozvcUi. 



9. Cephalon with the genal spines on a line with the anterior 



margin and with the intergcnal angles. Eyes short and con- 

 nected with anterior lobe of the glabella by occular ridges. 

 Natural size. The specimen represented is from a limestone 

 at the south end of the Tinipahute Range, Nevada (locality 



