THE FOSSIL STALK-EYED CRUSTACEA 39 



ably shorter and its granulation coarser, the upper margin is con- 

 vex, the lower sinuous. The fingers are long, narrow, slightly de- 

 tiexed, meeting when closed or nearly so; they are black except 

 the base of the dactylus, longitudinally deeply grooved, a row of 

 punctae in each groove; intervening ridges high; two ridges on 

 outer surface of each finger while a third ridge is visible above the 

 dactylus ; prehensile edges dentate ; on the fixed finger there are three 

 larger subacute teeth with concave sides, with one or two small teeth 

 in the interspaces. 



The merus of the first left ambulatory leg reaches forward nearly 

 as far as the carpus of the cheliped (pi. 9, fig. 4). 



Measiirevients. — Holotype male, width of carapace 23.3 mm., length 

 (approximate) 19 mm., width of front 7.4 mm., transverse width of 

 orbit 4 "mm., superior length of major manus 11.6 mm., height of 

 same 11 mm., height of major merus 6.7 mln., superior length of 

 minor manus 7 mm., height of same 6 Inm. 



Occurrence. — British Columbia : Sandstone shale sea cliffs for 3 

 miles west of Carmanah Point, Vancouver Island ; Oligocene series ; 

 one specimen ^^ showing carapace and chelipeds, holotype, in Stan- 

 ford University. 



Relation. — This has many points in common with P. americana^- 

 as, for example, the straight front, oblique orbits, very unequal 

 chelipeds, one massive, the other narrow and more coarsely granu- 

 late; above all the fingers of the small chela correspond to those 

 of the Recent species in the character of the grooves and ridges and 

 the dentation of the immovable finger. 



PILUMNOPLAX HANNIBALANUS, new species 

 Plate 10, figs. 1-4 



Description. — -Carapace chiefly flat and little areolated (pi. 10, 

 figs. 1 and 3). The branchial regions are slightly swollen, the sur- 

 face is deflexed along the postero-lateral borders, the antero-lateral 

 teeth are slightly upturned. Surface a little depressed behind front 

 and orbits; betAveen this depression and the angle of the front a 

 short oblique groove; a deep furrow forming the sides of an hour- 

 glass at the gastro-cardiac regions; and outside of, and parallel to 

 that, a narrow swelling. Solne fine granulation evident along ante- 

 rior and antero-lateral margins. 



Margin of front slightly arcuate forward, corners deflexed; margin 

 of orbit very oblique, somewhat concave, a suture leading almost 



^ This and all other specimens derived from the " N. I'ac." survey by Stanford Univer- 

 sity were submitted to the author by Prof. Bruce L. Clark, of the University of California. 



" Pilumnoplax americanus Rathbun, Bull. Lab. Nat. Hist. State Univ. Iowa, vol. 4. 

 189S, p. 283, pi. 7, flss. 1 and 2. 



