THE FOSSIL STALK-EYED CRUSTACEA 117 



not diverge distally but converge. This is probably, then, the major 

 chela of a female. The upper margin is more arcuate than in the 

 male, the lower margin is nearly at right angles to the proximal end, 

 and begins to curve upward near base of finger. Tubercles elongate, 

 few, four large ones on the palm forming a Y, a small tubercle 

 forming a longitudinal line below the middle. A tubercle on distal 

 margin" just above fixed finger. A blunt ridge runs lengthwise 

 through this finger; four tubercles above the ridge, three visible 

 below, tip of finger acute ; prehensile edge with a large basal tooth, 

 its margin as well as that of the tooth minutely crenulate, or near the 

 tip very minutely milled. The dactylus has been broken off and 

 slipped down partially behind the other finger; it also has a longi- 

 tudinal ridge, smooth except for some small tubercles near the articu- 

 lation; beneath the ridge at some distance one sees three large 



tubercles. 



Occwrence. — ^Washington: Twin, in shale sea cliffs west of West 

 Twin River for a distance of three-fourths mile; upper Oligocene 

 series; a specimen, of right manus and carpus showing the outer 

 surface (holotype) and on the reverse of the nodule the inner sur- 

 face of a pair of fingers and part of the right manus of a smaller 

 specimen (paratype a) ; also two other specimens of manus, one left, 

 one right, both incomplete (paratypes h and c). Holotype in Stan- 

 ford University. From the same locality, two incomplete specimens 

 of cheliped ; University of Washington, Loc. 179. 



Washington: About half a mile east of mouth of East Twin River, 

 Clallam County; Oligocene series; one specimen of left cheliped 

 (pi. 27, fig. 1), showing portions of ischium, merus, carpus and 

 proximal half of manus and an impression of the same (paratype e, 

 Cat. No. 353334, U.S.N.M.). 



Washington: South side of Richs Passage, Puget Sound; basal 

 conglomerate of upper Oligocene, or Blakeley formation; one left 



chela. 



Washington : Sandy shale bluffs on Grays River at Grays River ; 

 upper (?) Oligocene series ; one right chela, probably of a female 



(paratype <?). 



Measurements. — Holotype, right manus, middle length measured 

 to the gape 12 mm., greatest height, near distal end, 12.6 mm., height 

 near proximal end (approximate) 10.2 mm. Paratype a, length of 

 gape between fingers, tips meeting, 8.6 mm., greatest width across 

 fingers when closed 8.7 mm. 



Relation.— D'l^QVS from all the above described species in the 

 great distal divergence of the upper and lower margins of the manus 

 in the male and in the great width of both fingers and the character 

 of the tubercles. 



