CALIFORNIA STALK-EYED CRUSTACEA. 89 



Pinnixa occidentalis Rath. 



Pinnixa occidentalis Eathbun, Proc. U. S. Nat. Mus., Vol. XVI, 1893, p. 

 248. Newcombe, Bull. Nat. Hist. Soc. Brit. Col., 1893, p. 26. 



Male: Carapace uneven, about twice as wide as long; median region 

 tumid and bounded by sulci on either side and behind; a transverse crest 

 on the cardiac region which is not interrupted in the middle but becomes 

 lower and curves backwards. Behind this crest, which is more prominent 

 in the male, the carapace slopes rapidly downward, being nearly at right 

 angles to the surface in front of it. Front narrow, depressed, furnished 

 with a median groove, and not projecting beyond the general contour of 

 the carapace; a pair of prominences behind the anterior margin which is 

 slightly produced at the center. The antero-lateral margin is marked by 

 a sharp, more or less granulated line which begins a short distance external 

 to the orbit and meets the postero-lateral margin at a little less than a 

 right angle. Antennae longer than the width of the front. Maxillipeds 

 nearly longitudinal; second joint of the palp narrow (over twice as long 

 as wide), and tapering slightly from the base to the rounded tip; last 

 joint narrowly spatulate (about four times as long as broad), joined near 

 the base of and extending much beyond the preceding one; outer sur- 

 face of the last two joints sulcated. Chelipeds stout; hand broad, 

 smooth and shining, slightly widened distally, the upper and lower mar- 

 gins rounded and scabrous; pollex broad, short, deflexed and furnished 

 •with one or more teeth on the inner margin; dactyl much curved, some- 

 times having a minute tooth near the middle of the inner margin. The 

 first pair of ambulatory legs is slender, having slender dactyls which are 

 subequal to the preceding joint; second pair similar to the first but longer 

 and stouter; third pair longer and much stouter than the second, but more 

 slender than in tuhicola or littoralis; the dactyls slender, almost straight, 

 and about equal to the propodi; filth pair stouter than the first and 

 nearly as long, reaching considerably beyond the merus of the preceding 

 pair; dactyls slender, straight, and about equaling the propodi. The 

 abdomen tapers gradually from the second segment to the last, which is 

 rounded; the third, fourth, and fifth segments are subequal and slightly 

 longer than the sixth. The appendages and sides of the carapace are more 

 or less pubescent. The upper and lower margins and, to a less extent, 

 the surfaces of the ambulatory legs, are scabrous. 



Length of Carapace. Breadth of Carapace. Length of Third 



Ambulatory Leg. 



Male 7 mm 13.75 mm 19 mm. 



" 9.5 mm 19.5 mm 27 mm. 



Female 5 mm 9.25 mm 13.5 mm. 



" 10.5 mm 20.5 mm 24 mm. 



