182 STALK-EYED CRUSTACEA. 
are dorsally carinated, and the sixth is armed with a small, sharp, slender, 
horizontal spine. The fourth, fifth, and sixth segments are also ornamented 
with a lateral ridge; on the fourth segment the lateral ridge runs downward 
and backward, while on the fifth and sixth segments it is nearly horizontal. 
The sixth abdominal segment is equal in length to the fourth and fifth com- 
bined. The telson is about equal in length to the sixth segment of the 
abdomen ; it tapers to a slender point, is deeply channeled above, and armed 
with a few minute lateral spinules near the distal end. 
The eye-stalks are short, the eyes large, subspherical and black. 
The external margin of the basal antennular segment is raised to form 
a perpendicular wall outside the eye; the surface of this elevated margin is 
granulated, its margin ciliated ; there isno apparent stylocerite ; the internal 
process, or prosartema, is narrowly spatulate in form, ciliated, and a little 
shorter than the eyes; the dorsal face of the basal segment, in front of 
the eyes, as well as of the second segment, is tomentose; the antennu- 
lar flagella are thickened at the proximal end; the outer flagellum 1s con- 
siderably longer than the inner, being about equal in length to the carapace 
without the rostrum. 
The peduncle of the antenna is unarmed ; the scale exceeds the peduncle 
of the antennule by a little; the flagellum is very slender, and nearly twice 
the length of the body. 
The terminal segment of the mandibular palpus is broad oval in form, 
narrowing at distal half. 
The endopod of the first maxilla is elongated and segmented. The 
endopod of the first maxilliped is slender, and composed of four segments ; 
the exopod is laminate and unsegmented. 
The exopods of the second and third pairs of maxillipeds are very long, 
reaching forward to beyond the base of the antennal scale; they are fringed 
with long and delicate sete. The five pairs of legs are rather short. _ Their 
proportions are accurately given in the accompanying figure, which renders 
a detailed description unnecessary; they are all furnished with very small 
exopods; the inferior distal angle of the ischinm of the first and second pairs 
is furnished with a small, somewhat curved, sharp spine. 
The inner branch of the first pair of abdominal appendages is completely 
obsolete (in the female). The posterior pair of abdominal appendages have 
the two branches of unequal leneth, the outer exceeding the inner, the 
latter in turn surpassing the telson. 
