1064 THE VOYAGE OF H.M.S. CHALLENGER. 



spines, and that the third joint of the elongate palp is shorter than the second ; of the 

 maxfllipeds, that the plates are strong, the inner armed with three teeth, the outer 

 armed on the inner margin with teeth few but strong, as they approach the apex 

 longer and narrower, the series ending with curved setse, and that the last joint of the 

 elongate palp is not unguiform but apically armed with strong spines ; of the side- 

 plates that the four anterior pairs are large, feathered on the lower margin, and that 

 the fifth pair are larger than the fourth, incised on the hinder margin for the 

 retro verted third peraeopods. It is obviously only by a misprint or slip of the pen that 

 he speaks of the fifth peraeopods being shorter, instead of longer, than the fourth. 



PJwtis macrocarpus, n. sp. (PL CVIL). 



Rostrum quite small, lateral lobes of the head small and angular ; the postero-lateral 

 corners of the second and third pleon-segments almost squared, with two little spinules 

 within the hind margin. 



Eyes small round, situated on the lateral lobes of the head, the ocelli very few. 



Upper Antennae. — First joint rather long and stout, with one or two slender spines at 

 the lower apex, the second joint longer and more slender, with slender spines at six 

 points of the lower margin ; the third joint about as long as the first, with five pairs of 

 spines on the lower margin, the lowest the longest ; the flagellum of fourteen slender 

 joints, together about as long as the peduncle, and carrying similar spines. 



Lower Antennas subequal in length to the upper The first two joints short, the 

 gland-cone small, not very prominent ; the third joint as long as the preceding two 

 united ; the fourth subequal to the second of the upper antennas, proximally bent 

 and thin, a little widened distally, with a few slender spines on the under margin ; the 

 fifth joint shorter than the preceding, longer than the third of the upper antennae, 

 slightly curved, with spines at five points of the lower margin ; the flagellum of twelve 

 slender joints tipped with longer or shorter spines. Many of the spines on both pairs of 

 antennae are slightly flattened on the concave border. 



Upper Lip. — The front plate broad, its distal margin convex, unsymmetrically 

 emarginate, furred with small cilia pointing inwards on either side of the shallow 

 emargination. 



Mandibles. — The trunk very small compared with the palp ; the cutting plate having 

 its edge divided into five teeth ; the secondary plate on the left mandible has four 

 teeth ; on the right mandible the secondary plate is smaller, ending in one prominent 

 tooth, along the side of which are several denticles ; there are on the left mandible 

 four, on the right mandible three, much bent denticulate spines in the spine-row, 

 followed by some plumose cilia ; the molar tubercle is tolerably strong, with the 

 crown nearly round and closely set with fine denticles ; at its outer corner a small 



