608 THE VOYAGE OF H.M.S. CHALLENGER, 



Anonyx ampulloides, Spence Bate (Stimpson, MS.) (PI. III.). 



1862. Ano?iyx amjJuUoides, Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 78, pi. xii. fig. 8. 



Rostrum rudimentary ; lateral lobes of the head rounded ; the head as long as the 

 first perseon-segment ; first persecn-segment longer than the second. Perseon dorsally 

 rounded. First four segments of pleon dorsally acute, the third segment deeply 

 excavate above the much upturned, slightly produced postero-lateral angles, the lower 

 margin being as it were bent up so as to form a piece of the hinder margin. The 

 fourth segment with a dorsal depression, the sixth laterally ridged above on each 

 side of the telson. 



Eyes reniform, occupying a great part of the surface of the head, and nearly meeting 

 at the top of it, therefore very large. The component ocelli short and small, numbering 

 certainly more than three hundred. 



Of the somewhat projecting connate epistome and upper lip a lateral view is given in 

 the Plate. 



Upper Antennae. — First joint large and tumid, second and third very smaU ; 

 flagellum incomplete, eleven joints remaining, of which the first, bearing a brush, 

 equals in length some six or seven together of those which follow ; the secondary 

 flagellum, of seven or eight joints, has the first of ec[ual length with the first of the 

 primary and partially sheathed in a fold of that joint ; its terminal joints are narrow. 



Lower Antenna. — Gland-cone seemingly very obtuse ; third joint narrow proximally, 

 widened distally, with spines on the upper distal margin ; fourth joint longer and much 

 stouter than the fifth, furred on the upper margin, carrying a row of feathered cilia on 

 the lower, and on its prominent apex a group of long setae ; the fifth joint furred on its 

 upper margin. Of the flagellum there remained only ten joints, the first of these being 

 ecjual in length to the two following combined. 



Mandihles. — The cutting edge smoothly convex, with a denticle at the top ; the 

 lower rim in front is cut into four spine-shaped teeth, the margin of the mandible 

 behind these being straight and smooth ; the secondary plate on the left mandible high 

 up on the primary, ligulate or spiniform, very small ; the spine-row consists of four spines 

 followed by nine branching spiniform setae ; the molar tubercle long, produced backwards, 

 strongl}- furred with cilia, but not dentate ; the palp set far forward, level with the front 

 of the molar tubercle, the second joint considerably longer than the third, on its outer side 

 a long row of spines or setae curving round the upper half of inner margin to the outer 

 apex, three on the upper part of the outer margin ; third joint widening for rather more 

 than a quarter of its length, and from that point carrying a row of eighteen spines along 

 the inner margin to the apex ; this joint has also five setae in three sets on the inner side 

 near the outer margin. 



Loiver Lip. — Strongly ciliated on the inner and apical borders ; the distal portion of 



