112 STALK-EYED CRUSTACEA. 
gins spinulose ; the sixth are acute, and armed with a small spine at the 
point, but otherwise unarmed. The telson, besides bearing the two spines 
above-mentioned, is sparsely spinulose along its margin; it bears two longi- 
tudinal dorsal ridges, and its posterior end is subacute. 
The proximal segment of the first antenne is short and broad, and is pro- 
duced at the inner distal angle into a long, sharp, tooth-like process, which is 
hairy along the basal part of the immer side, but not armed with spines; the 
outer side of the segment is swollen and furnished with two small spines at 
the distal end ; the second and third segments diminish successively in size ; 
the third segment bears two flagella, the upper and outer of which is only 
one half as long as the lower and inner one; the shorter one is composed of 
about thirty segments, the lower one of about fifty. The basal segment of 
the peduncle of the second antenna is short and broad, and carries a long, 
slender, cylindrical process (phymacerite of Bate) on its inner side ; this pro- 
cess is directed inward and forward, is nearly as long as the peduncle of the 
antenna, obliquely truncate at the tip in the left one, while the one on the 
right side is rounded at the tip; the distal end of the phymacerite is free, 
and does not slide upon the basal segment of the first antenna as it does in 
Polycheles and Willemoesia; the second segment also is short and broad, and 
bears an external foliaceous scale (scaphocerite) which is oval and hairy on 
the margins, but destitute of spimes; its tip reaches to the end of the 
peduncle ; the third and fourth segments are longer, cylindrical, subequal; 
the flagellum is about equal in length to the longer of the antennulary 
flagella, and contains about fifty segments. 
The mouth is bounded in front by .a large, protuberant labrum (Plate 
XXX., Fig. 1, ¢), and is flanked by the broadly expanded mandibles (Plate 
XXIX., Fig. 2). The latter are without molar areas; their crowns are ser- 
rated on their cutting edges with fourteen triangular teeth, of which one at 
the anterior angle, one in the middle, and two at the posterior angle are 
larger than the others; the mandibular palpus is triarticulate, the terminal 
segment setose. Directly below and behind the base of the mandibles lie the 
widely separated, palpiform lobes of the metastoma (Plate XXX., Fig. 1, &). 
The first maxilla (Plate XXIX., Fig. 24 is reduced to two slender, 
strongly incurved, protognathal lobes, the anterior of which is the larger, 
Both lobes are setiferous. There appears to be no trace of the endognath. 
The second maxilla (Plate XXIX., Fig. 2”) has two small and slender 
protognathal lobes, the anterior of which is much the longer. The endo- 
