148 DR. CHARLES CHILTON ON THE SUBTERRANEAN 
First gnathopod with the basos very broad, the width at the 
distal end in the male being fully one-half the length: ischium 
and meros both short and subquadrate and of about equal size ; 
meros with its distal border fringed with a row of long sete, of 
which one is much longer than the others and is finely barbed, 
curved, and reaches about as far as the end of the propodos; 
greatest length of the carpus considerably less than that of the 
propodos; extremity very oblique and nearly all occupied by 
the articulation of the propodos, so that the posterior border is 
very short; a tuft of sete at the antero-distal angle, and a row 
along the outer edge of the short posterior border, on the inner 
surface is a row of about seven long sete along the half of the 
oblique extremity nearest to the posterior border: propodos 
large, subtriangular, broadest distally where the breadth is 
slightly greater than the length of the anterior border: palm 
transverse, straight or slightly convex; anterior border with a 
tuft of about six sete at base of dactylos, and a smaller tuft 
situated a little proximally to this; the posterior border bears 
six short transverse rows of setz ; palm defined by a stout spine, 
and near it two smaller spines coarsely serrated, along the palm 
is a row of short sete, with one or two longer ones at intervals: 
dactylos fitting closely on to the palm, terminal claw very acute, 
secondary claw distinct and sharp with a short seta at its base, 
outer border convex and bearing only one seta opposite the base 
of the secondary claw. 
Second gnathopod slightly larger than the first, but very 
similar in form: basos not so broad, the greatest breadth being 
rather less than half the length; ischium and meros similar to 
those of the first gnathopod, but the meros without the large 
curved seta; carpus as long as the propodos, rather more 
slender than in the first gnathopod, the posterior surface longer 
and slightly concave for the reception of the base of the pro- 
podos, both edges bearing a row of sete; propodos as in the 
first gnathopod, but with the breadth at distal end distinctly 
greater than the Jength of the anterior border; posterior border 
very convex and with nine rows of sete ; dactylos as in first 
gnathopod. 
First and second pereiopoda equal in length, third slightly 
longer, fourth and fifth each distinctly longer than the one 
immediately preceding. Basa of third, fourth, and fifth pereio- 
poda rather narrow, the greatest breadth being rather more than 
one-half of the length. 
