88 
MR. W. K. BROOKS OK LUCIFER : 
and its vertical diameter is more than half that of the thorax. It has a median dorsal 
rostrum (fig. 61, R), which is much smaller relatively in the adult than in the young, 
and. two antero-lateral spines (Is). About half-way between the rostrum and the 
lateral spine the anterior edge of the neck has an extremely minute spine on each 
side, as in the younger stage last described. The cerebral ganglia (eg) occupy the 
ventral half of the anterior end of the neck, and the long commissures can be seen 
at co. running back to join the ventral nervous system. The cephalic lobes of the 
stomach (s) and the antennary gland (g) occupy the dorsal portion of the neck. 
The true carapace (c) does not reach down on to the sides of the body as far as the 
basal joints of the thoracic limbs and mouth parts, and both these and their ganglia 
(figs. 75 and 76, tg) are visible below its free edge. Its edges are smooth, but there 
is a small spine at its anterior end. 
The labrum (fig. 61, L) is massive and prominent, but there is no trace of a spine. 
The inner surface of the mandible (fig. 62) is marked by a number of parallel 
ridges, one for each denticle; and there is a second, and a faint trace of a third, series 
of denticles on the outer surface (fig. 63). There is no trace of a mandibular palpus. 
The scaphognathite of the first maxilla (fig. 64) has disappeared, the endopodite is 
rudimentary, while the second basal joint is very much larger than the first, and carries 
about fifteen stout short hairs arranged in three rows. The first joint has four much 
larger unequal hairs, which are serrated. The outer edge of the first and both edges 
of the second joint carry a single delicate plumose hair each. Fig. 65 shows the 
inner surface of the second basal joint. 
The second maxilla (Plate 8, fig. 67) is more like that of the larva. There is a 
three-jointed inner portion with short stiff hairs, and an extremely large scaphognathite 
(fig. 67, sc), which is long and narrow, and united to the body of the appendage by a 
very narrow stalk. The outer end carries three rather stiff, short, plumose hairs, and 
five similar but somewhat longer hairs arise from the inner surface between the outer 
end and the area of attachment. The inner end carries four plumose hairs, three of 
which are almost as long as the scaphognathite itself, while the fourth appeared to be 
broken off in the four specimens which I dissected out. 
The first maxi biped is a short, stout, two-jointed appendage (Plate 8, fig. 68), 
convex on its outer but flat on its inner surface, and fringed with short, stout, plumose 
hairs. 
The second maxilliped (Plate 7, fig. 61, Mp. 2, and Plate 8, fig. 70) is a long 
jointed limb, bent into a knee, and formed of six joints. It is fringed by long plumose 
hairs, which, on all the joints except the first and second, are arranged in a single row. 
The first and shortest joint has no hairs; the next, or second, has one row of five and 
one row of three ; the next, or third, has six hairs; the next, or fourth, and the fifth 
have ten each ; and the terminal joint has six. 
The next or third maxilliped (fig. 61, Mp. 3) is a long, slender, six-jointed limb, with 
a double row of short hairs. 
