THE FOSSIL STALK-EYED CRUSTACEA 49 



of front and orbits granulate, granules interrupted just outside the 

 outer tooth of the front and in the line of the closed fissure in the 

 orbit. Outer angle of orbit not dentiform; inner inferior angle 

 jjroduced in a spine. The eyes appear to fill the orbits. Belo^Y and 

 behind the outer, bent-down angle of the front lies the basal article 

 of the antenna ; while between the two is wedged the outer angle of 

 the large, swollen, basal article of the antennula. The merus of the 

 outer maxillipeds (British Columbia, No. 141) is broader than long,^ 

 anterior and posterior margins subparallel, antero-external angle 

 laterally produced, antero-internal angle notched; inner and outer 

 margins of ischium subparallel, a deep, oblique furrow runs on the 

 inner half, its distal end much nearer the inner margin than its 

 proximal end; exognath in its widest part half as wide as ischium 

 of endognath. 



Sternum and abdomen : The sternum shows on its first or anterior 

 segment, a deeply impressed groove on either side which starts at the 

 anterior margin of the cheliped at its insertion and follows the line 

 of that margin, the two grooves becoming shallow as they approach 

 the median line, and meeting in an obtuse angle (pi. 13, fig. 3). A 

 shallow groove begins at ea( h of the postero-lateral angles of 

 the same sternal segment, and runs obliquely forward and inward. 

 In only one specimen, a female (N. Pac. 253) is the whole sternum 

 exposed; the genital openings are very large, not quite round, with a 

 diameter of about 4.5 mm. parallel to the anterior margin of the 

 segment and a diameter of 3.7 mm. in the opposite direction. 



In the male the seven abdominal segments are distinct; the third 

 segment is widest; the abdomen diminishes rather uniformly from 

 the middle of the third segment to the end of the sixth, the distal 

 angles of which are advanced a little about the angles of the seventh 

 segment; this segment is subtriangular, with slightly sinuous sides 

 and a broadly rounded tip. The third, fourth and fifth segments are 

 of subequal length although none of them is of uniform length 

 throughout its width. 



In the female the third segment is narrower than the fourth and 

 its margins converge considerably at the outer ends. Tlie fifth seg- 

 ment is a little longer than the fourth and of about equal width; 

 in one specimen it appears a little wider, in another specimen not 

 quite so wide as the fourth; the sixth is as wide as the fifth (pL 

 13, fig. 3). 



Chelipeds: The chelipeds are very unequal in the male; both are 

 massive, their surface is granulated, the granules forming more or 

 less into lines. The merus is stout, increases in size from the 

 proximal to the distal end and has a broad and deep furrow par- 

 allel to the distal end. The carpus also has a subdistal furrow and 

 a rounded, inner angle. The major palm is thick, oval in section,. 



