142 University of California Publications. [Zoology 



at its outer end ; third joint about as long as first, armed \vith a 

 plnmose seta at its outer extremity ; the following six joints small, 

 and quadrangular, each with a large plumose seta, except the 

 last which also bears a small plumose seta in addition to the large 

 one. The secondary branch consists of three joints; first joint 

 rather short, quadrangular, with four small setae at the base and 

 one near the middle ; second and third joints elongated, slender, 

 forming a grasping organ ; the second bears two setae near the 

 middle; third reflexed upon second, with one seta near its base 

 and two near its outer extremity. 



Basal joint of mandible without biting process and setae ; first 

 joint of palp with three setae on the upper margin and four on 

 the lower; on the inner side at the distal end, this joint bears a 

 sensory appendage which is ciliated at its outer end ; second joint 

 of palp short, with two setae on its loM'er margin ; third elongated, 

 cylindrical, with three setae on the upper margin and a tuft of 

 four short and two longer setae at the distal end of the lower 

 margin; last joint small, bearing a stout claw and three setae; 

 none of the mandibular setae plumose. 



Vermiform limb with four terminal and four lateral setae. 

 The caudal lamina bears six claws, the upper two of which are 

 very small; terminal claw strongly pectinated; remaining claws 

 with very minute pectinations ; each claw with a few cilia at the 

 base. 



Length 1.3 ; height 0.8 mm. 



Female unknown. 



Catches 124, 571, 589, 612. For these localities see P. longi- 

 seta, Cylindroleheris mariae and Rutiderma rostrata. 



Genus Cylindroleberis Brady, 1868. 



{Asterope Philippi.) 



Shell more or less oblong or elliptical, smooth ; in male rather 

 larger than in female ; always with a distinct rostral sinus. Eyes 

 well developed in both sexes. Frontal organ long and slender. 

 Antennule six- or seven-jointed; dorsal margin with numerous 

 plumose setae ; in both sexes the fifth joint bears a sensory organ ; 

 in the female the last joint bears only rather short setae, while 

 in the male two are unusually long, about as long as the entire 



