THE FOSSIL STALK-EYED CRUSTACEA 121 



CALLIANASSA OREGONENSIS Dana 



Plate 28, figs. 6-9 



Calliatmssa oregonensis Dana. U. S. Explor. Exped., Geol., 1849, p. 722; 

 atlas, pi. 17, fig. 3 (type-locality, near Astoria, in calcareous concretions 

 of argillaceous rock ; Miocene series [probably Oligocene] ; type not 

 found, probably not extant). 



Description. — No. 5456: Manus (pi. 28, fig. 8) suboblong, outer 

 surface very convex in a vertical direction, lower margin serrate, 

 serrations continued on immobile finger. 



Fingers of about equal width, separated at base ; gape small, grad- 

 ually diminishing toward the tips. Prehensile edges crenulate. 

 Socket-bearing tubercles prominent ; a row of five on inner surface 

 of dactylus below upper margin (about a third of finger lacking) ; 

 two rows of smaller tubercles below, five in the lowest row, three in 

 the intermediate; a row of eight tubercles besides two out of line 

 on the outer surface just over the upper margin. Only three tuber- 

 cles are visible on propodal finger, at its base, in a row just above but 

 not parallel to lower margin. Outer margins of fingers nearly 

 straight, toward the ends they curve toward each other. 



No. 5458 : A triangular pointed tooth projects obliquely distad into 

 the gape from just below the dactylus. 



No. 5458 : A large manus has the upper and lower margins con- 

 verging distally, and may belong to a female (pi. 28, fig. 7). 



No. 5454: Left minor cheliped (pi. 28, fig. 9). Inner margins of 

 fingers sinuous, the dactylus bearing a long shallow lobe at its middle. 

 Two rows of pits on each finger and some additional pits irregularly 

 placed. Carpus wider than manus, distal end oblique, the lower 

 angle produced distad in a triangular tooth. Merus with a high 

 blunt median ridge and a basal wing with similar ridge which 

 reaches to the middle line of the main part of the article. 



Memurements. — Minor cheliped, No. 5454: Middle length of 

 manus 12.8 mm., width of manus 7.3 mm., length of fingers 8 mm., 

 length of entire propodus 19.6 mm., middle length of carpus 15 

 mm., distal height of carpus 8.2 mm., greatest height of same 9.2 

 mm., length of merus 14.2 mm. Chela, No. 80: Length about 24.5 

 mm., width 11.7 mm. Cheliped No. 80: Length of ischium 18.8 mm., 

 greatest width or height (across outer and lower surface and large 

 tooth) 10.8 nun., length of carpus 22.2 mm. (perhaps exaggerated), 

 length of manus 17.6 mm., height of same 11.5 mm. 



Occurrence. — Washington: Sandy bluffs along Chehalis River for 

 1 mile east of Helsing Junction, Independence : upper Oligocene ; one 

 right wrist. 



3020— 2ti 9 



