NO. 2 CAMBRIAN AND LOWER OZARKIAN TRILOBITES 59 



MALADIA new genus 



PI. 12, fig. 2. (Nat. size.) Outline drawing of the type cephalon and associated 



pygidium. 



Maladia exhibits certain relationships to Eurckia but differs in the 

 course of the facial suture and structure of the pygidium. 

 Genotype.- — M. ainericana new species. 

 Range. — Upper Cambrian or Ozarkian, Idaho and Grand Canyon. 



MODOCIA new genus 



PI. 12, fig. 7. (Nat. size.) Outline drawing of the type cranidium. 



The genus Modocia is established to include species with wide fixed 

 cheeks which were formerly referred to six different genera. 



Genotype. — Arionelhis (Grepicephahts) ozueni Meek and Hayden 

 (Proc. Acad. Nat. Sci., Phila., 1861, p. 436). 



Range. — Upper Cambrian, Black Hills, Rocky Mountains. 



MOOSIA new genus 



PL 14, fig. 9. (Nat. size.) Outline draw'ing of the type species. 

 Moosia resembles Olenus but differs in the course of the facial 

 suture and backward direction of the eye lines. 

 Genotype. — M. grandis new species. 

 Range. — Ozarkian, Rocky Mountains. 



MOXOMIA new genus 



PI. 12, fig. 3. (X3.) Outline drawing of dorsal and side views of type 



cranidium. 



Moxomia is characterized by the quadrate glabella and cranidium 

 and the small eyes situated far forward 

 Genotype. — -M. hecuba new species. 

 Range. — Ozarkian. British Columbia. 



TAENICEPHALUS Ulrich and Resser MSS. new genus 



PI. 13, fig. I. (Nat. size.) Diagrammatic drawing of type cephalon and 



associated pygidium. 



Tacnicc phalli s includes those forms assigned by Hall to Conaspis, 

 which are congeneric with C. shumardi. 



Genotype. — Conocephalites shumardi Hall (i6th Ann. Rept. New 

 York State Cabinet Nat. Hist., i863, p. 154, p. 7, figs, i, 2). 



Range. — Upper Cambrian. Mississippi Valley and Rocky Moun- 

 tains. ^«^^^„ . 



TOSTONIA new genus 



PI. 13, fig. 2. (X2.) Outline drawings of type cranidium and associated 



pygidium. 



Tostonia is another of the forms which resembles Olenus and 

 Triarthropsis. It diff'ers in width of the fixed cheeks and course of 

 the facial suture and in the spinose pygidium. 



