PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 51 
The mandibles are of essentially the same form as in J/unida; the 
molar area is transverse to the body of the mandible, narrow, naked, 
and separated from the broad and edentulous ventral process by adeep 
excavation; and the palpus is slender, triarticulate, and armed with 
few and short sete. The protognathal lobes of the first maxilla are 
approximately equal in size, rather broad at the ends, and armed as 
usual with slender spines upon the distal, and numerous setz upon the 
proximal lobe. The endognath is much shorter than the distal lobe of 
the protognath, slender, tapered to an obtuse point, and armed with 
two series of small setz, one at the tip and the other below the middle. 
The protognathal lobes of the second maxilla are approximately equal 
in size, and each lobe is divided into two lobules very unequal in width, 
the two middle lobules being approximately a third as wide as the an- 
terior and posterior, though all four of the lobules are of about the 
same length. The endognath is a little longer than the distal lobe of 
the protognath, tapers to a slender tip, and is armed with a very few 
sete along the middle of its length. The anterior portion of the sea- 
phognath is a little shorter than the endognath, broad, slightly narrowed 
anteriorly, but broad and obtusely rounded at the tip, while the poste- 
rior portion is short, transversely truncated behind, broader than long, 
and somewhat triangular in outline, with the angles rounded. 
The tips of the lobes of the protopod of the first maxilliped are rounded 
and nearly alike, but the distal lobe is considerably longer than the 
proximal, being about twice as long as broad. The endopod is about 
as long as the distal lobe of the protopod, narrow, tapered to an obtuse 
tip, very strongly curved, the outer edge margined with slender sete 
distally, and proximally witha very few sete near the inner edge. The 
exopod is lamellar, a little longer than the endopod and much broader, 
being about a fifth as broad as long, rapidly narrowed at the extremity, 
and margined with slender set along the outer edge. The epipod is 
about as broad but scarcely as long as the distal lobe of the protopod, 
triangular at the extremity, and ciliated at the tip and along the outer 
edge. Theendopod of the second maxilliped is of nearly equal breadth 
from the base to the dactylus; the ischium is scarcely longer than 
broad; the merus nearly three times as long as broad and about as long 
as the three terminal segments taken together; the carpus and propo- 
dus are subequal in length; the dactylus is shorter and much narrower 
than the propodus, and rounded at the tip; and all the segments are 
more or less armed as usual with sete of different forms, and at the 
distal end of the inner edge there is a single slender spine or spiniform 
setz in addition to a few short sete. The exopod is much larger than 
the endopod; the unsegmented basal portion is nearly uniform in 
breadth for about the proximal two-thirds of its length, where it expands 
in an obtuse prominence opposite the carpus of the endopod, but from 
this prominence it tapers to the articulation with the slender flagellum ; 
except near the tip both edges are margined with short set, and the 
