THE FOSSIL STALK-EYED CRUSTACEA 29 



Superfamily BRACHYRHYNCHA Borradaile 



Family OCYPODIDAE Milne Edwards 



Front not wide and often a narrow deflexed lobe; the orbits 

 occupy the whole anterior border of the carapace outside the front, 

 their outer wall often defective. Buccal cavern large, a little nar- 

 rower in front, the outer maxillipeds often completely closing it; 

 palp coarse, articulating at or near antero-external angle of merus. 

 Abdomen of male narrow. Male openings sternal. 



Genus UCA Leach 



FIDDLER CKABS 



Vca Leach, Edin. Encyc, vol. 7, 1814, p. 430 ; type, V. una Leach, 1814 

 = C/. heterochelos (Lamarck), 1801. — Rathbun, Bull. U. S. Nat. Mus., 

 No. 97, 1918, p. 374. 



Carapace subquadrilateral, antero-lateral angles produced ; front 

 narrow, orbits occupying remainder of width of carapace. Cheli- 

 peds of male extraordinarilj'' unequal, of female small and equal. 



Pliocene — Recent, 



UCA OLDROYDI," new sp«cies 



Plate 7, figs. 1 and 2 



Descnption. — The anterior margin of the carapace either side of 

 the rostrum is oblique and sinuous; next to the rostrum it forms a 

 deep narrow bay, followed by a long arch the inner slope of which 

 is short and the outer long (pi. 7, fig. 1) ; outer angle acute, directed 

 outward and forward; situated in a line considerably behind the 

 rostrum. Rostrum small, spatulate, neck of spatula nearly as broad 

 as blade, the median furrow linear, continued backward in a broad 

 shallow depression. Lateral depressions irregular, but in the main 

 parallel to the median line. Dorsal surface, so far as it remains, 

 nongranulate. Lateral margins concave, moderately convergent pos- 

 teriorly, and marked by a faintly granulate blunt rim. 



The specimen has been strongly compressed dorsally and the lower 

 margin of the orbit pushed forward ; only one tubercle remains on it 

 and that is long, large and truncate. The ambulatory legs down to 

 the ends of the merus are partly visible; the merus has a strongly 

 convex upper margin, a slightly convex lower margin. The ab- 

 dominal segments have been so disturbed that the proportions of only 

 the fifth can be determined (pi. 7, fig. 2). 



Measurements (approximate). — Holotype male, length of carapace 

 18.5 mm., width of same 29.3 mm. 



^ Named for Mr., and Mrs. T. S. Oldroyd, who have collected, and been instnimontal in 

 sending, large nunrbers of California fossils for inclusion in this report. 



