8-4 Xorth American 



forming- the basal lobes, always separated by a circular furrow from the rest 

 of the glabella ; eyes large, reniform. surface fineh' facetted. Occipital fur- 

 row deep ; movable cheek separated from the glabella hj the suture, which 

 forms an acute angle with the circular border of the cheek in front of tlie 

 glabella ; while the facial suture cuts obliquely across the posterior margin, 

 just behind the t\e, leaving a small pointed portion fixed to the glabella b}' 

 the occipital lobe ; angles of cheeks more or less produced, margin of the 

 head incurved, forming a striated and punctated rim. Thoracic segments 

 nine in number, the axis distinctly marked off by the distinct dorsal fur- 

 rows. Pygidium, usualh' with a rounded border, the axis composed of 

 from 12 to 18 coalesced segments. 



Hypostoma of PhilUpsia DerUensis is large, mesial lobe broad and spatu- 

 late, ala? small, smooth, and pointed. 



PHILLIPSIA PERANNULATA, Shumard. 



PMlliX)sia perannulata, Shumard, 1858, Trans, Acad. Sci. St. Louis, Vol. 



I, p. 296, pi. XI, fig. 10. 



Pj^gidium deltoid, as wide as long, elevated ; border narrow, smooth, in- 

 flected behind, outer edge sinuate, inner edge obtusely subangulated. the 

 anterior two-thirds marked with a shallow furrow ; posterior extremity nar- 

 row, very strongly arched ; axial lobe elevated, nearly as wide as one lateral 

 lobe, tapering very gradually from front to postei'ior extremity, which is 

 bluntly rounded and nearly terminal ; axial rings from 28 to 30, rounded, 

 distinct on the dorsum, becoming obsolete on the sides ; margins sinuate, sur- 

 face of each ring studded with a single row of 4 or 5 granules, those of one 

 ring alternating with those of the adjoining ones ; transverse furrows much 

 narrower than the rings and not deeply impressed ; lateral lobes arched, 

 somewhat flattened superiorly ; segments 8, subangulated, simple, gently 

 arched forwards, posterior ones directed obliquely backwards, the last one 

 being nearly parallel with the longitudinal axis ; transverse furrows deep 

 and rather broad ; surface of rings garnished with a row of distinct granules. 



Dimensions. — Length and width, 0.74 ; height, 0.28 inch. 



Geological position and locality, Carboniferous, Guadalupe ^Mountains, 

 New Mexico. 



PHII.I.IPSIA CI.IFTONENSIS, Shumard. 



PMllipsia Cliftonensis, Shumard, 1858, Trans. Acad. Sci. St. Louis, Vol. I, 



p. 227. 

 PMllipsia Cliftonensis, Herrick. 1887, Bull. Sci. Lab. Denison Univ., Vol. 



II, p. 61, 



Pygidium small, semi elliptical, gibbous, width greater than the length ; 

 axial lobe elevated longitudinally, gently arched ; dorsum slightly de- 

 pressed, width at forward extremity about equal to one lateral lobe exclud- 

 ing the smooth margin, gradually tapering and terminating in a blunt point 



