188 Bulletin Vanderbilt Marine Museum, Vol. VI 



Technical description : The larger of the Anaho Bay, Mar- 

 quesas Islands, specimens is the one herein described. The cara- 

 pace is short, compact, 10 mm. long from the orbital angle to 

 posterior margin, 10 mm. median height in profile, moderately 

 convex on either side of the median dorsal line, which is ele- 

 vated from a little in front of the flatly carinated posterior mar- 

 gin toward the center for the proximal two-fifths of the carapace, 

 from which point forward it becomes a carinate, denticulate crest 

 bearing three increasingly larger, acute, triangulate, forward- 

 directed teeth on the carapace behind the orbital angle, beyond 

 which point the large, laminate-dentate rostrum extends forward, 

 curving downward moderately and thence the apical two-thirds 

 is curved upward, the distal third exceeding in height the high- 

 est point of the posterior rostral crest. The fourth rostral tooth is 

 the largest of the series and occurs above the eye ; the fifth tooth 

 is well in advance of the fourth, much smaller, less crest-like, 

 being situated approximately at the point where the upcurving 

 of the distal rostrum begins and also marking the anterior termi- 

 nation of the rostral upper lateral carina, which vanishes pos- 

 teriorly just behind the orbital angle. The distal upper portion of 

 the margin of the rostrum is without teeth, subcarinate, the up- 

 turned distal end truncate, tridentate ; these teeth acute, triangu- 

 late, slightly increasing in size from upper to lower and with tufts 

 of bristly setae between the teeth. There is a median lateral thick- 

 ish carina proximally above the orbit, on either side of the ros- 

 trum. The lower portion of the rostrum is produced into a deep 

 convex lamina proximally, this lamina narrowing on the distal 

 half ; the deep convex portion is deeply incised into four unequal 

 teeth, the second of which is unequally bifid, while the narrow 

 lamina of the distal portion of the rostrum bears two more teeth ; 

 the teeth of the ventral series decrease in size toward the distal 

 end of the rostrum, the sixth, or subdistal, tooth being subequal 

 to the distal upper tooth. The spaces between the teeth on the 

 inferior rostral margin are heavily fringed with coarse setae. 

 There is a slender, acute, suborbital tooth present which projects 

 almost to the base of the scaphocerite. The antennal angle has a 

 small spine and the anterolateral spine is subacute. 



The abdominal terga are rather compact, the first three broad 

 dorsally; the third segment is the longest of the series in the 

 median line, being produced and rounded posteriorly in this 



