THE FOSSIL STALK-EYED CRUSTACEA 91 



near the lateral spines bears a few granules directed forward. Un- 

 derlying surfaces are granulate, the granules thinning out toward 

 the middle. 



The pterygostomian regions are swollen (pi. 22, fig. 2). The 

 merus of the left outer maxilliped is fairly complete; it is rather 

 short and broad with a deep inner groove; the outer margin of the 

 exognath is very convex. The episternum is subcircular, broadly 

 pointed at the extremity and invaginated in the first sternal somite 

 from which it is separated By a narrow fissure on each side. The 

 first somite is characteristically broad, the lateral extremities have 

 not been uncovered. 



Measurements. — Holotype, greatest width 52.5 mm., fronto-orbital 

 width about 25 mm.; hinder end of carapace missing. 



Occurrence. — California: West side of Tecuya Creek; southeast 

 quarter of southeast quarter, section 26, township 10-20 west ; Eocene 

 series, very close to the type-locality of the Tejon formation; one 

 specimen, holotype, in California Academy of Sciences. 



Pig. 2. — Ranina Americana. Sternum (first and second segments) or larger speci- 

 men, N. Pac. 167, X 3. Episternum after Withers 



RANINA AMERICANA Withers 



Plate 23, figs. 1^ 



Ranina americana Withers, Anii. Mag. Nat. Hist., ser. 9, vol. 14, 1924, 

 p. 125, pi. 4, figs. 1-3 ; type-locality, Clallam Bay, south shore of Strait 

 of Juan de Fuca, Washington ; upper Oligocene, Blakeley formation, in 

 a matrix of greenish grey sandstone ; Brit. Mus., Cat. No. In. 23798. 



Description. — Viewed laterally the carapace is moderately convex 

 in an antero-posterior direction, and equally convex on its anterior 

 and posterior slopes ; the convexity from side to side is much greater. 

 Surface rough with scabrous granules, which are sparse and single on 

 the anterior "middle portion, larger and closer posteriorly and toward 

 the lateral and anterior borders where they have a tendency to form 

 in short, transverse roAvs of two or three granules. The posterior of 

 the lateral teeth is situated at the anterior fourth of the carapace (pi. 

 23, figs. 2 and 4), It is directed nearly transversely outward and 



