240 



Position and Locality— Upper Red Wall, north side of Wbito River 

 Canyon, twelve miles southwest of Fort Apache, Arizona. 



FENESTELLA? 

 Plate, Fig. 4. 

 Bryozoa; reverse side, branches ridged, long and generally straight; 

 dissepiments from one-fourth to one-half the size of the branches; surface 

 covered with a porous calcareous covering. 



Position and Locality.— Upper Red Wall, near Fort Apache, Arizona. 



PUGNAX HALL (1893). 



PUGNAX UTA. 



Plate, Figs. 8 a, b. 



Meek's description: Shell small, more or less variable in form, often 

 suljtrigonial, generally widi-r than long, more or loss gibbous; front trun- 

 cated, or sometimes sinuous in oiitline; anterior lateral margins rounded 

 in outline; posterior lateral margins convex or nearly straight and con- 

 verging toward the beak at an angle of from 90° to 120°. Dorsal valve 

 more convex than the other, greatest convexity near the middle or between 

 it and the front, which has a broad, rather deep, marginal sinus for the 

 reception of the corresponding projection of the front of the other valve; 

 mesial fold somewhat flattened, but slightly prominent, and rarely trace- 

 able back of the middle of the valve; generally composed of three but 

 sometimes four — rarely more— plications; side rounding doAvn rapidly on 

 each side of the mesial fold, and each occupied by about three or four 

 plications; beak curving strongly beneath that of the other valve; interior 

 with a faint linear mesial ridge, on each side of which is a raised curved 

 line enclosing an ovate space, occupied by the abductor muscular impres- 

 sions. Ventral valve distinctly less convex than the other, with a broad, 

 shallow, short sinus, occupied by about two or three plications: anterior 

 lateral margins on each side of sinus, with from two to four plications; 

 beak moderately prominent, and more or less arched, rather pointed; 

 foramen s)uall." 



Position and Locality.— Upper Red Wall, north bank of White River, 

 twelve miles southwest of Fort Apache, Arizona. 



