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 is no apparent stylocerite ; the internal 

 proces.s, 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 is con- 

 siderably longer than the inner, being about equal in length to tlie carapace 

 without the rostrum. 



The peduncle of the antenna is unarmed ; the scale exceeds the peduncle 

 of the antennule hy a little ; the ilagellum 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 setJB. The five pairs of legs are rather short. Their 

 proportions are accurately given in the accompanying figure, which renders 

 a detailed description imnecessary ; they are all furnished with very small 

 exopods; the inferior distal angle of the ischium of the first and second pairs 

 is furnished with a snudl, 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 length, the outer exceeding the inner, the 

 latter in turn surpassing the telson. 



