THE FOSSIL STAL.K-EYED CRUSTACEA 99 



Genus RANIDINA Bittner 



Ranidina Bittner, Sitzimgsber. Kais. Akad. Wiss., Wien, math.-naturw. CI., 

 vol. 102, Abth. 1, 1893, p. 33 ; type, R. rosaUae Bittner. 



Anterior margin of carapace narrow, with three triangular teeth 

 inchiding rostrum; thence the carapace widens rapidly to a large 

 lateral tooth about one-third the distance to the narrow posterior 

 margin. Sternum broad between feet of first and second pairs. 



Oligocene; Miocene. 



RANIDINA WILLAPENSIS, new species 



Plate 21, figs. 4 and 5 



Description. — Carapace nearly flat from side to side except near 

 the margin; very convex or swollen below (pi. 21, fig. 4). Shape 

 suboval up to the base of the outer orbital spine which is directed 

 obliquely outward and forward (pi. 21, fig. 5) ; fronto-orbital dis- 

 tance narrow, details obscured; posterior margin much narrower. 

 Lateral spine stout, triangular, transverse, directed obliquely upward 

 and outward. Only a small section of the outer surface of the shell 

 remains, behind the right middle; it is covered with large punctae 

 near together forming a net work. Lower surface coarsely granulate. 



Measurements. — The holotype is cracked obliquely longitudinally 

 through the middle and also lacks the right margin, so that meas- 

 urements are approximate. Length of carapace 47.4 mm. ; width of 

 same just in front of lateral spine 32 mm.; distance on median line 

 between the front margin and a line drawn between the lateral spines 

 18 mm. ; distance between (broken) tips of lateral spine and of outer 

 spine of orbit 17 mm. ; distance from tip of lateral spine to posterior 

 margin 35.3 mm. ; greatest thickness of carapace 14 mm. 



Occurrence. — ^Washington : Tuffaceous sandstone bluffs along the 

 Willapa River, north of Holcomb; middle Oligocene series. One 

 specimen, holotype, showing the dorsal surface of the carapace in- 

 completely and a portion of the right ventral surface; in Stanford 

 University. 



Washington : Sea clifi^s between Classens Wharf and the ship canal 

 estuary, Townsend Bay ; lower Oligocene series ; one specimen show- 

 ing the left side of the ventral surface of the carapace. Its identity 

 is made reasonably certain by its great breadth and the character of 

 the surface. 



Relation. — From R. rosaliae Bittner ^^ from the Miocene of Hun- 

 gary our species differs in its smoother surface, and inward-pointing 

 orbital spine. 



*2 Sitzungsber. k. Akad. Wiss., math.-naturw. CI., Wien, vol. 102, Abth. 1, 1893, p. 33. 



