42 U.S. NATIONAL MUSEUM BULLETIN 236 



portions 11:6), nude, cyclindrical, each ramus with 5 marginal setae 

 and 1 appendicular seta. Setae 1 and 4 small, plumose, placed at 

 end of internal and external margins. External seta (5) very small, 

 nude, and placed almost at end of external margin. Setae 2 and 3 

 lengthened and thickened, especially 2nd, apices curving outward. 

 Both setae are strongly setose. Appendicular seta very small. 



Antennules short, 21-segmented, reaching half length of cephalic 

 somite; setation represented in figure 9a. 



Antenna (fig. 9b) composed of coxa, basis, and 2-segmented endop- 

 odite; exopodite fully absent. Coxa with 2 setae at end of internal 

 and external margin; basis with single seta. 1st endopodal segment 

 with 1+3 setae. Terminal (2nd) endopodal segment with 6 genicu- 

 late setae and 1 appendicular seta. 



Mandible (fig. 9c) with much reduced palp, represented by knob- 

 shaped projection, bearing 2 long setae (third seta must have been 

 removed during preparation). Cutting edge of mandibular praecoxa 

 with 10 sharp teeth of variable size and a small, fine seta at base of 

 row of teeth (fig. 9d). 



Maxillule (fig. 9e) with greatly developed praecoxal arthrite, 

 bearing 5 strong, short teeth and 2 haired setae. Remainder of 

 maxillule (basis, coxa, endopodite, and exopodite) represented by 

 process with denticulated margin and articulating with arthrite, 

 carrying two setae. I cannot homologize these structures with the parts 

 of a normally developed maxillule because of the extreme degree 

 of reduction and the absence of intermediary species. 



Maxilla (fig. 9f) strongly developed. Praecoxa with rounded, 

 low endite, carrying a fine seta. Coxal endite large, with 2 spines, 

 one of which is coalescent with endite. Basis distinctly articulating 

 with the coxa, carrying 2 spines and 1 seta. Endopodite smaU, 

 1-segmented, with 4 spiniform setae. 



Maxillipede (fig. 9g) small, coxa and basis of same length; coxa 

 with 2 setae, each placed on small lobe. Basis strongly swollen 

 internally and with single fine, long seta. Endopodite apparently 

 3-segmented, but articulation, especially between segments 2 and 

 3, obscure. 1st segment small, segment 2 styhform, 3 times as long 

 as wide, with single seta. Apical segment with 2 claw-shaped spines 

 of unequal size. 



Legs 1-4 (figs. 10a~d) practically identical with those of Euryte 

 rohusta Giesbrecht, as described by Sars (1913, pi. 13) and SeweU 

 (1949, p. 31, fig. 2), especially with regard to length of spines and 

 spiniform setae on endopodites, and in this respect very different 

 from E. longicauda Philippi, E. similis T. Scott, E. curticornis 

 G. O. Sars, and E. brevicauda SeweU. On the legs there are two 

 types of spines, viz., spines with a broad, ovate, serrated lamella, 



