REPORT ON THE AMPHIPODA. 1137 



Upper Antenna?. — The first joint thick, shorter than the head, with slender spines at 

 three points of the under margin ; the second joiut longer, much thinner, with spines at 

 six points of the under margin, and spinules at three or four of the upper ; the third 

 joint thinner than the second, a little longer than the first, with spines at five points of 

 the lower margin ; the flagellum curved, of six rather stiff joints, together longer than 

 the second joint of the peduncle, each joint tipped with a couple of spines and several 

 setules; the secondary flagellum not half as long or half as broad as the first joint of the 

 primary, consisting of a single narrow joint tipped with a seta and setule. 



Lower Antenna;. — The first two joints short, the gland-cone narrow, acute, decurrent ; 

 the third joint as long as the two preceding united, with spines at two points of the under 

 margin, and several about the apical ; the fourth joint longer and stouter than the second 

 of the upper antennas, with spines at six points below, and some spinules above ; the fifth 

 joint similar, but thinner and slightly longer, both a little curved ; the flagellum of five 

 joints tipped with groups of short spines and setae, the five together equal in length to 

 the second joint of the upper antennae, the first longer than the two following united, and 

 having several marginal spines and spinules. Both pairs of antennaj have what appear to 

 be little hairy parasites, some of which are figured ; in every case they are situated in a 

 group of setas or setules. 



Mandibles. — The cutting edge divided into five teeth ; the secondary plate with 

 four teeth, stronger on the left than on the right mandible, the latter having only one 

 that is at all prominent ; the spine-row of three spines on the left, seemingly followed 

 by one or two plumose setas ; on the right mandible there are only two spines ; the 

 molar tubercle prominent, with long teeth round the crown ; in this species the 

 laminar process is much longer than in Poclocerus falcatus, fully twice as long as broad, 

 bent close to its base, then straight, widening but little distally, much striated or ciliated, 

 with the apical margin faintly denticulate ; the first joint of the palp short, distally 

 widened, the second a good deal longer than the third, with many spines along both 

 margins, a small space being vacant at the distal end of the inner and the basal end 

 of the outer margin ; the third joint from a narrow neck is expanded distally, the 

 basal part free from spines, but the rest set with many feathered spines round 

 both the outer and inner margin and the broad distal margin, where the spines are 

 long. One mandible is figured in position beside the lower antenna to show the 

 comparative sizes. 



Lower Lip. — The principal lobes with the distal margins flattened, the inner lobes 

 oval, neither pair strongly ciliated ; the mandibular processes short, conical. 



First Maxilla?. — The inner plate small, with a seta on the narrow apex ; the outer 

 plate narrow, with nine spines on the truncate distal margin, of which two have a single 

 lateral tooth near the apex on the outer side, one may be considered as furcate, and the 

 remainder have one denticle, two, or none, on the inner side ; the first joint of the palp 



(ZOOL. CHALL. EXP. — PART LXVII. — 1888.) Xxx 143 



