THE FOSSIL. STALK-EYED CRUSTACEA 



115 



o-roup of tubercles near the upper distal corner, but the correspond- 

 tng group on the outer surface may be very inconspicuous or repre- 

 sented by only one or two tubercles. 



The stump of the fixed finger has on its upper surface two tubercles 

 on its inner margin and one just outside its outer margin. The stump 

 of the dactylus (pi. 26, fig. 8) is smashed flat, but appears to have 

 four large tubercles above and three on the outer side. The distal 

 portion of the carpus (pi. 26, fig. 7) diminishes rapidly in height. 



3Ieasurements.-l.eit manus (N. Pac. 281), length measured hori- 

 zontally from upper base of fixed finger 21.7 mm., superior length 

 (approximate) 19.G mm., height at middle 21 mm., height at base of 

 fingers 20.7 mm., height near proximal end 20.7 mm., greatest thick- 

 ness 10 mm. , -^T 1 -o- I, 1-c 



Occurrence.— Washington : Shale bluffs along the Nasel Eiver halt 



a mile above mouth of Salmon Creek, Nasel; middle (?) Oligocene 

 series ; one left manus. . 



Washington: Twin, in shale sea cliffs west of West Twin Kiver 

 for a distance of three-fourths mile; upper (?) Oligocene series; 

 11 specimens of manus, sometimes only a fragment, 6 from the right 

 side and 5 from the left, two with a stump of the fixed finger 

 attached, two others with the base of the dactylus and two with a 



piece of the carpus. ^^ ^ f rt 



Relation.— The manus of C. cMlamensis resembles tnat ot 6. 

 knapptomnsis in having the distal margin vertical in direction and 

 the lower distal quarter of the outer surface tuberculate. It differs, 

 however, in being shorter and in having the proximal margin ver- 

 tical instead of oblique. 



CALLIANASSA TWINENSIS, new species 



Plate 27, figs. \-A 



Eolotype.-The manus (pi. 27, fig. 2) increases notably in width 

 from the proximal to the distal end; its lower proximal corner forms 

 a rounded lobe which is produced backward a little beyond the line 

 of the manus-carpus articulation. Upper margin somewhat arcuate, 

 lower margin chiefly straight and inclined downward toward the 

 fino-er. The distal margin between the fixed finger and the articula- 

 tion with the dactyl is at right angles to the upper margin but very 

 oblique to the lower margin; it forms a reentering angle with that 

 portion of the distal margin above it, which in turn is oblique to the 

 upper margin. The upper, proximal and lower margins have a thm 

 rim which stands out at an angle with the surface. The outer sur- 

 face is convex from top to bottom, less so from end to end. ien 

 tubercles on lower half, all but one in distal quarter; four are 

 lar^rer than the others. The tubercles are different from those found 



