Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 29 



supporting flagellum consisting of many fine rings and extending as 

 far forward as the base of the movable finger of the great chela. 



The peduncles of the. inner antennae are about as long as the eye- 

 stalks ; the flagellum is triarticulate, each joint successively increasing 

 in length distally ; it is two-branched, the longer, stouter branch being 

 about as long as the third peduncular article, tapering conically and 

 consisting of about 25 rings and bearing a long, fine brush of setae 

 on the ventral side. The shorter, lower branch is about half as long 

 as the upper branch and consists of 10 or 11 annulations which are 

 about the same diameter as the distal annulations of the upper 

 flagellum. 



The left cheliped is much larger than the right and has the basis 

 and ischium quite small, only the outer distal angle of the latter being 

 visible in a dorsal view ; the merus is trigonal, the dorsal surface broad 

 and curved; the carpus is a trifle shorter than the merus, narrower 

 basally, outwardly convex and broadening distally to form a close 

 union with the propodus ; the inner distal angle of the carpus is pro- 

 duced into a tiny interlocking point and the outer distal angle of the 

 carpus is produced into a similar interlocking point and its lateral 

 contour slightly ridged. The propodus is subovate, almost subcir- 

 cular ; its diameter, taken at the base of the movable finger, is slightly 

 greater than the long diameter, taken from the inner basal angle of 

 the finger to the carpal margin. The fixed finger is wider basally than 

 long, the line from the tip of the fixed finger to the outer basal angle 

 of the movable finger obtusely truncates the hand, being practically 

 an unbroken line, save for the minute median depression into which 

 the basal tooth of the movable finger fits. This line and the placing 

 of the fingers is distinctly different from Calcinus chilensis Milne 

 Edwards, which Stimpson says his species, Calcinus odscurus, is like, 

 ''except for the absence of tubercles on the chela." The movable 

 finger of the present species has the outer margin curved, the apex 

 occurring at the outer lateral margin, the inner margin fitting closely 

 upon that of the fixed finger. The fingers open obtusely ; their distal 

 ends are neatly spoon-shaped and the meeting surfaces of the fixed 

 finger crenulated, indicating 14 teeth along the outer margin of the 

 meeting surfaces ; the inner margin of this surface of the finger is set 

 with five clusters of brush-like setae, the largest and innermost one 

 being opposite the basal great molar, the remaining four being sub- 

 equal, the distal two being almost beside each other. The movable 

 finger is similarly crenulated, indicating seven teeth of moderate size 



